Also known as : White crocus 'Grand Maître', Giant crocus 'Grand Maître'
Dutch crocus 'Grand Maître' is a species of Dutch crocus. It reaches heights of 13 cm tall, rare for a plant in this family. Another rarity is the color of the blooms. Flowers are violet-blue with orange stamens. The unique color makes the plants popular in spring gardens.
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Common Pests & Diseases About Dutch crocus 'Grand Maître'
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Common issues for Dutch crocus 'Grand Maître' based on 10 million real cases
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Mealybug
Mealybug infestation on Dutch crocus 'Grand Maître' leads to stippling, yellowing, and distortion of leaves, severely affecting the aesthetic and health of the plant. These pests thrive in warm conditions, excreting honeydew that promotes sooty mold growth.
Soil mold
Moist environments may encourage the growth of mushrooms or other fungi at the soil's surface that do not affect the health of the plant.
Solutions: Measures to take to remove soil mold: Physically remove mold/mushrooms - remove and dispose of mushrooms. To remove mold, scrape 1/8” of soil from the surface. Add a layer of sand or gravel - adding 1/4” of sand or gravel on top of the soil surface will discourage new fungal growth Sprinkle an antifungal treatment around the plants - this doesn't have to be a commercial fungicide, as many growers swear by all-natural remedies like cinnamon and baking soda Some types of mold contain toxins that can be harmful to humans or irritate those with allergies or asthma. Wear a dust mask while performing these tasks.
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Leaf beetles
Leaf beetles are a class of colored insects 1 to 2 cm in size. They gnaw on leaves and petals resulting in small, round holes scattered over the surface.
Solutions: For less serious cases: Remove beetles, nymphs, and eggs. Remove all life stages of the beetles and kill them by placing them in a bucket of warm, soapy water. This can be done more easily by placing the bucket under affected leaves and shaking the plant. This method is most effective in the afternoon when leaf beetles are more active. Always dispose of insects in a sealed bag or container to avoid escape and spread. To treat more serious infestations: Apply organic insecticides. Use naturally-derived insecticides before moving on to synthetic insecticides. Neem oil and pyrethrum are naturally-derived insecticides that should be applied following label instructions. Apply synthetic insecticides. Examples of insecticides effective for leaf beetles include carbaryl, permethrin, and bifenthrin. Apply insecticides according to label instructions.
Mealybug
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Mealybug Disease on Dutch crocus 'Grand Maître'?
Mealybug infestation on Dutch crocus 'Grand Maître' leads to stippling, yellowing, and distortion of leaves, severely affecting the aesthetic and health of the plant. These pests thrive in warm conditions, excreting honeydew that promotes sooty mold growth.
Symptom Analysis
On Dutch crocus 'Grand Maître', symptoms include cotton-like wax appearance on leaf axils, undersides of leaves, and stems. Leaves may become yellow, wilt, and drop prematurely.
What Causes Mealybug Disease on Dutch crocus 'Grand Maître'?
1
Pests
Mealybugs are soft-bodied insects covered with a white, mealy coating; they suck sap from plant tissues.
How to Treat Mealybug Disease on Dutch crocus 'Grand Maître'?
1
Non pesticide
Manual removal: Wipe off or use a jet of water to dislodge mealybugs from Dutch crocus 'Grand Maître'.
Biological control: Introduce natural predators like lacewings or ladybugs.
2
Pesticide
Insecticidal soap: Apply insecticidal soap directly to infested areas, ensuring to cover all mealybugs.
Systemic insecticides: Use systemic insecticides if infestation persists, following label instructions for suitable dosages.
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Soil mold
Moist environments may encourage the growth of mushrooms or other fungi at the soil's surface that do not affect the health of the plant.
Overview
If there is soil mold around the plants, this isn't necessarily a reason to panic. Mold can occur for several reasons. Most of the time, it's harmless. The microorganisms that exist in mold are, in fact, necessary for healthy plant life. That said, it can be unsightly and in some cases, harmful to certain plants. It's important to understand why mold might be forming. It is only after the potential causes have been identified that steps can be taken to stop mold from spreading or appearing in the future.
Symptom Analysis
The most obvious sign of soil mold is, of course, mold observed on the surface of the soil. This can be fuzzy and white, yellow, or gray in color. Other symptoms may include:
Mushrooms
Wilted plants
Plants are stunted in growth
Soil has an odd "off" smell
Premature leaf drop or flower/blossom/fruit rot
Excess water is leaking from drainage holes
While soil mold doesn't always harm the growth of a plant, it can indicate the presence of a larger problem that needs to be addressed (and these problems can often harm plants).
Disease Cause
There are several causes for soil mold. Understanding why mold is growing should be the first step in deciding on the best course of action.
Some potential causes include:
Overwatering - fungi consume excess water, so the presence of mold indicates that there is water that the plants aren't readily using
Poor drainage - this can be caused by dense, compacted soil, a lack of drainage holes, or an inadequate pot size
Poor air circulation - this is common in indoor-grown plants, especially in the winter when windows are closed
Contaminated soil - while all soil contains microorganisms, soil can contain fungal spores that lead to mold growth
Decomposing leaves on the soil surface feed the mold
Continue reading in our app - it's better
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Scan the QR code with your phone camera to download the app
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Overview
Regardless of the type of plant or where it is grown, at some point, it will begin to aged yellow and dry. This is a natural, unavoidable process that happens when the plant has completed all of the steps in its life.
Annual plants go through this process at the end of a single growing season. Perennial plants live for multiple years, if not tens or hundreds of years, but will still ultimately exhibit these symptoms.
Symptom Analysis
When plants have progressed through their natural developmental stages and are nearing the end of their lifecycle, they begin showing signs of decline. Leaves will start to yellow and droop, and over time they turn papery brown and dry.
Once completely dry, the leaves begin to fall from the plant until the entire plant has dried out.
Disease Cause
At the end of its life, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence or natural aging and death. Cell division stops, and the plant begins catabolizing resources to use in other parts of the plant.
As this happens, the tissues begin yellow and drying until the entire plant is desiccated and perishes.
Continue reading in our app - it's better
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Scan the QR code with your phone camera to download the app
Leaf beetles
Leaf beetles are a class of colored insects 1 to 2 cm in size. They gnaw on leaves and petals resulting in small, round holes scattered over the surface.
Overview
Leaf beetles range in size from 1.5 mm to 2 cm. Both adult beetles and their larvae eat the leaves of many different types of plants. There are over 35,000 different species of leaf beetles, in a variety of colors including gold, green, yellow-striped, and red striped. Some of these have been mistaken for ladybirds because of their shape and coloring. They can be oval, round, or elongated in shape. These insect pests are most active in spring and summer.
If not controlled, leaf beetles can do a lot of damage to vegetable crops and ornamental plants. They feed on the leaves, flowers, stems, roots, and fruits of different plants. They can fly, which means it's easy for them to move from one plant to another. Some species of leaf beetles only target one specific crop, while others will target many different types of plants. Although a lot of the damage that they cause is cosmetic, an infestation can weaken a plant and leave it prone to other more problematic diseases.
Symptom Analysis
The first signs of a leaf beetles infestation are small visible holes in leaves. Leaves then become discolored and dark beetle droppings can be seen. As the leaves turn yellow and brown, they will drop off the plant onto the ground. Some leaves will appear skeletonized with only the veins still remaining.
Infestation begins in spring, when the adult beetles emerge from the soil and lay their eggs on the leaves of plants. When these eggs hatch, the young nymphs start munching on the leaves as they grow up. Once leaf beetles are large and mature, they'll fall to the ground and pupate in the soil over winter before starting the cycle all over again.
Leaf beetles also eat holes in fruits and vegetables. These can be seen as small round holes that sometimes have a larger brown area surrounding them.
Solutions
For less serious cases:
Remove beetles, nymphs, and eggs. Remove all life stages of the beetles and kill them by placing them in a bucket of warm, soapy water. This can be done more easily by placing the bucket under affected leaves and shaking the plant. This method is most effective in the afternoon when leaf beetles are more active. Always dispose of insects in a sealed bag or container to avoid escape and spread.
To treat more serious infestations:
Apply organic insecticides. Use naturally-derived insecticides before moving on to synthetic insecticides. Neem oil and pyrethrum are naturally-derived insecticides that should be applied following label instructions.
Apply synthetic insecticides. Examples of insecticides effective for leaf beetles include carbaryl, permethrin, and bifenthrin. Apply insecticides according to label instructions.
Continue reading in our app - it's better
A database of 400000+ plants and unlimited guides at your fingertips...
Scan the QR code with your phone camera to download the app
More Info on Dutch Crocus 'grand Maître' Growth and Care
Feedback
Common Pests & Diseases
Mealybug
Mealybug infestation on Dutch crocus 'Grand Maître' leads to stippling, yellowing, and distortion of leaves, severely affecting the aesthetic and health of the plant. These pests thrive in warm conditions, excreting honeydew that promotes sooty mold growth.
Read More
Flower wilting
Flower wilting in Dutch crocus 'Grand Maître', a symptom of stress or disease, leads to droopy, lifeless flowers affecting the plant's aesthetic and vitality. Immediate attention to causes is crucial for recovery.
Read More
Scale insect
Scale insects can severely affect Dutch crocus 'Grand Maître' by sucking sap from the plant, leading to yellowing leaves, stunted growth, and in severe cases, plant death. This pest thrives in warm, dry environments.
Read More
Whitefly
Whitefly is a pest causing significant damage to 'Dutch crocus 'Grand Maître'' by feeding on plant sap, leading to yellowing leaves, reduced growth, and potential wilting. This disease is particularly destructive due to its rapid reproduction and ability to spread viral diseases.
Read More
Flower withering
Flower withering in Dutch crocus 'Grand Maître' is a condition that results in the premature decay of blooms, affecting the aesthetic and vitality of the plant. This condition inhibit's the plant's ability to reproduce and weakens its overall health.
Read More
Thrips
Thrips are tiny pests affecting Dutch crocus 'Grand Maître', leading to distorted growth and reduced blooming. They thrive in warm, dry conditions and can spread quickly between plants, causing significant visual and physiological damage.
Read More
Caterpillar
Caterpillar disease refers to damages caused by caterpillars feeding on 'Dutch crocus 'Grand Maître''. These pests can severely defoliate and weaken plants, impacting their blooms and overall vigor.
Read More
Dodder
Dodder is a parasitic plant affecting various hosts, including 'Dutch crocus 'Grand Maître''. It depletes nutrients, causing stunted growth and potential death of infected plants, significantly diminishing aesthetic and health.
Read More
Leafhopper
Leafhopper disease impacts Dutch crocus 'Grand Maître' by feeding on sap and transmitting pathogens, causing yellowing and stunting growth. It typically harms leaves and overall plant vitality.
Read More
Leaf rot
Leaf rot in Dutch crocus 'Grand Maître' primarily results from fungal infections, leading to discolored, wilting foliage, impeding photosynthesis and potentially causing plant death if untreated.
Read More
Weevil
Weevil disease in Dutch crocus 'Grand Maître' primarily results from larvae damage, leading to stunted growth and potential plant death. This pest problem significantly impacts aesthetic value and viability of Dutch crocus 'Grand Maître'.
Read More
Leaf wilting
Leaf wilting in 'Dutch crocus 'Grand Maître'' primarily results from insufficient water uptake or pathogenic attacks, leading to drooping, discoloration, and potentially plant death if unmanaged.
Read More
Aphid
Aphids, small sap-sucking pests, frequently infest 'Dutch crocus 'Grand Maître''. They weaken the plant by feeding on the sap, leading to distorted growth and a decreased bloom vitality.
Read More
Dark blotch
Dark blotch is a fungal disease affecting Dutch crocus 'Grand Maître', causing discolored, necrotic patches on leaves and reduced flowering. This disease can severely impact the plant's aesthetic and health if uncontrolled.
Read More
Spider mite
Spider mite infestation severely impacts the Dutch crocus 'Grand Maître', causing discoloration and leaf damage that can weaken the plant. These pests thrive in warm, dry environments, particularly affecting Dutch crocus 'Grand Maître' during bloom.
Read More
Leaf beetle
Leaf beetles, impacting 'Dutch crocus 'Grand Maître'', target foliage, leading to discoloration and potential defoliation. Crucial for early identification, especially during the plant's flowering period to minimize damage.
Read More
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About
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Dutch crocus 'Grand Maître'
Crocus vernus 'Grand Maître'
Also known as: White crocus 'Grand Maître', Giant crocus 'Grand Maître'
Dutch crocus 'Grand Maître' is a species of Dutch crocus. It reaches heights of 13 cm tall, rare for a plant in this family. Another rarity is the color of the blooms. Flowers are violet-blue with orange stamens. The unique color makes the plants popular in spring gardens.
Hardiness Zones
6 to 9
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Common Pests & Diseases About Dutch crocus 'Grand Maître'
Feedback
Common issues for Dutch crocus 'Grand Maître' based on 10 million real cases
Plant disease auto-diagnose & prevention
AI-powered plant doctor helps you diagnose plant problems in seconds.
Download the App for Free
Mealybug
Mealybug infestation on Dutch crocus 'Grand Maître' leads to stippling, yellowing, and distortion of leaves, severely affecting the aesthetic and health of the plant. These pests thrive in warm conditions, excreting honeydew that promotes sooty mold growth.
Learn More About the Mealybug
Soil mold
Moist environments may encourage the growth of mushrooms or other fungi at the soil's surface that do not affect the health of the plant.
Solutions: Measures to take to remove soil mold: Physically remove mold/mushrooms - remove and dispose of mushrooms. To remove mold, scrape 1/8” of soil from the surface. Add a layer of sand or gravel - adding 1/4” of sand or gravel on top of the soil surface will discourage new fungal growth Sprinkle an antifungal treatment around the plants - this doesn't have to be a commercial fungicide, as many growers swear by all-natural remedies like cinnamon and baking soda Some types of mold contain toxins that can be harmful to humans or irritate those with allergies or asthma. Wear a dust mask while performing these tasks.
Learn More About the Soil mold
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Learn More About the Aged yellow and dry
Leaf beetles
Leaf beetles are a class of colored insects 1 to 2 cm in size. They gnaw on leaves and petals resulting in small, round holes scattered over the surface.
Solutions: For less serious cases: Remove beetles, nymphs, and eggs. Remove all life stages of the beetles and kill them by placing them in a bucket of warm, soapy water. This can be done more easily by placing the bucket under affected leaves and shaking the plant. This method is most effective in the afternoon when leaf beetles are more active. Always dispose of insects in a sealed bag or container to avoid escape and spread. To treat more serious infestations: Apply organic insecticides. Use naturally-derived insecticides before moving on to synthetic insecticides. Neem oil and pyrethrum are naturally-derived insecticides that should be applied following label instructions. Apply synthetic insecticides. Examples of insecticides effective for leaf beetles include carbaryl, permethrin, and bifenthrin. Apply insecticides according to label instructions.
Learn More About the Leaf beetles
Mealybug
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Mealybug Disease on Dutch crocus 'Grand Maître'?
Mealybug infestation on Dutch crocus 'Grand Maître' leads to stippling, yellowing, and distortion of leaves, severely affecting the aesthetic and health of the plant. These pests thrive in warm conditions, excreting honeydew that promotes sooty mold growth.
Symptom Analysis
On Dutch crocus 'Grand Maître', symptoms include cotton-like wax appearance on leaf axils, undersides of leaves, and stems. Leaves may become yellow, wilt, and drop prematurely.
What Causes Mealybug Disease on Dutch crocus 'Grand Maître'?
1
Pests
Mealybugs are soft-bodied insects covered with a white, mealy coating; they suck sap from plant tissues.
How to Treat Mealybug Disease on Dutch crocus 'Grand Maître'?
1
Non pesticide
Manual removal: Wipe off or use a jet of water to dislodge mealybugs from Dutch crocus 'Grand Maître'.
Biological control: Introduce natural predators like lacewings or ladybugs.
2
Pesticide
Insecticidal soap: Apply insecticidal soap directly to infested areas, ensuring to cover all mealybugs.
Systemic insecticides: Use systemic insecticides if infestation persists, following label instructions for suitable dosages.
Continue reading in our app - it's better
A database of 400000+ plants unlimited guides at your fingertips...
Soil mold
Moist environments may encourage the growth of mushrooms or other fungi at the soil's surface that do not affect the health of the plant.
Overview
If there is soil mold around the plants, this isn't necessarily a reason to panic. Mold can occur for several reasons. Most of the time, it's harmless. The microorganisms that exist in mold are, in fact, necessary for healthy plant life. That said, it can be unsightly and in some cases, harmful to certain plants. It's important to understand why mold might be forming. It is only after the potential causes have been identified that steps can be taken to stop mold from spreading or appearing in the future.
Symptom Analysis
The most obvious sign of soil mold is, of course, mold observed on the surface of the soil. This can be fuzzy and white, yellow, or gray in color. Other symptoms may include:
Mushrooms
Wilted plants
Plants are stunted in growth
Soil has an odd "off" smell
Premature leaf drop or flower/blossom/fruit rot
Excess water is leaking from drainage holes
While soil mold doesn't always harm the growth of a plant, it can indicate the presence of a larger problem that needs to be addressed (and these problems can often harm plants).
Disease Cause
There are several causes for soil mold. Understanding why mold is growing should be the first step in deciding on the best course of action.
Some potential causes include:
Overwatering - fungi consume excess water, so the presence of mold indicates that there is water that the plants aren't readily using
Poor drainage - this can be caused by dense, compacted soil, a lack of drainage holes, or an inadequate pot size
Poor air circulation - this is common in indoor-grown plants, especially in the winter when windows are closed
Contaminated soil - while all soil contains microorganisms, soil can contain fungal spores that lead to mold growth
Decomposing leaves on the soil surface feed the mold
Solutions
Measures to take to remove soil mold:
Physically remove mold/mushrooms - remove and dispose of mushrooms. To remove mold, scrape 1/8” of soil from the surface.
Add a layer of sand or gravel - adding 1/4” of sand or gravel on top of the soil surface will discourage new fungal growth
Sprinkle an antifungal treatment around the plants - this doesn't have to be a commercial fungicide, as many growers swear by all-natural remedies like cinnamon and baking soda
Some types of mold contain toxins that can be harmful to humans or irritate those with allergies or asthma. Wear a dust mask while performing these tasks.
Prevention
Follow these practices to prevent soil mold from forming.
Limit moisture - avoid keeping soil damp, and allow it to dry out between waterings. Watering from the bottom of pots with drainage can allow the surface soil to stay dry.
Provide aeration - increase airflow around the plants using a fan or wind.
Repot - if the container is too small or lacks proper drainage, transplant the plant into a new, better-draining container.
Apply a layer of sand - apply 6 mm of sand on top of soil.
Use potting mix - when planting, only use potting mix instead of regular soil, as this is specially formulated for the proper moisture retention.
Continue reading in our app - it's better
A database of 400000+ plants unlimited guides at your fingertips...
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Overview
Regardless of the type of plant or where it is grown, at some point, it will begin to aged yellow and dry. This is a natural, unavoidable process that happens when the plant has completed all of the steps in its life.
Annual plants go through this process at the end of a single growing season. Perennial plants live for multiple years, if not tens or hundreds of years, but will still ultimately exhibit these symptoms.
Symptom Analysis
When plants have progressed through their natural developmental stages and are nearing the end of their lifecycle, they begin showing signs of decline. Leaves will start to yellow and droop, and over time they turn papery brown and dry.
Once completely dry, the leaves begin to fall from the plant until the entire plant has dried out.
Disease Cause
At the end of its life, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence or natural aging and death. Cell division stops, and the plant begins catabolizing resources to use in other parts of the plant.
As this happens, the tissues begin yellow and drying until the entire plant is desiccated and perishes.
Solutions
If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Prevention
Unfortunately, there is no way to prevent plants from dying of “old age.” To help prolong their life, and put off symptoms of aged yellow and dry for as long as possible, take care of them by giving them enough water, fertilizing them appropriately, and making sure they get enough sunlight.
Continue reading in our app - it's better
A database of 400000+ plants unlimited guides at your fingertips...
Leaf beetles
Leaf beetles are a class of colored insects 1 to 2 cm in size. They gnaw on leaves and petals resulting in small, round holes scattered over the surface.
Overview
Leaf beetles range in size from 1.5 mm to 2 cm. Both adult beetles and their larvae eat the leaves of many different types of plants. There are over 35,000 different species of leaf beetles, in a variety of colors including gold, green, yellow-striped, and red striped. Some of these have been mistaken for ladybirds because of their shape and coloring. They can be oval, round, or elongated in shape. These insect pests are most active in spring and summer.
If not controlled, leaf beetles can do a lot of damage to vegetable crops and ornamental plants. They feed on the leaves, flowers, stems, roots, and fruits of different plants. They can fly, which means it's easy for them to move from one plant to another. Some species of leaf beetles only target one specific crop, while others will target many different types of plants. Although a lot of the damage that they cause is cosmetic, an infestation can weaken a plant and leave it prone to other more problematic diseases.
Symptom Analysis
The first signs of a leaf beetles infestation are small visible holes in leaves. Leaves then become discolored and dark beetle droppings can be seen. As the leaves turn yellow and brown, they will drop off the plant onto the ground. Some leaves will appear skeletonized with only the veins still remaining.
Infestation begins in spring, when the adult beetles emerge from the soil and lay their eggs on the leaves of plants. When these eggs hatch, the young nymphs start munching on the leaves as they grow up. Once leaf beetles are large and mature, they'll fall to the ground and pupate in the soil over winter before starting the cycle all over again.
Leaf beetles also eat holes in fruits and vegetables. These can be seen as small round holes that sometimes have a larger brown area surrounding them.
Solutions
For less serious cases:
Remove beetles, nymphs, and eggs. Remove all life stages of the beetles and kill them by placing them in a bucket of warm, soapy water. This can be done more easily by placing the bucket under affected leaves and shaking the plant. This method is most effective in the afternoon when leaf beetles are more active. Always dispose of insects in a sealed bag or container to avoid escape and spread.
To treat more serious infestations:
Apply organic insecticides. Use naturally-derived insecticides before moving on to synthetic insecticides. Neem oil and pyrethrum are naturally-derived insecticides that should be applied following label instructions.
Apply synthetic insecticides. Examples of insecticides effective for leaf beetles include carbaryl, permethrin, and bifenthrin. Apply insecticides according to label instructions.
Prevention
To prevent infestations of leaf beetles, follow these practices.
Regularly check for beetles. To prevent large pest infestations, be proactive about frequently checking plants for pests and removing them quickly.
Clear debris. Clear weeds and debris to remove areas where these beetles may overwinter and hide.
Attract natural predators. Birds and other insects, such as wasps and ladybugs, are effective natural predators of leaf beetles. Encourage them to visit by including a diverse array of plants to provide habitat and food. Also, avoid applying broad-spectrum herbicides that can harm and kill beneficial insects.
Plant aromatic herbs like mint, garlic, or rosemary, as these can repel leaf beetles.
Continue reading in our app - it's better
A database of 400000+ plants unlimited guides at your fingertips...
More Info on Dutch Crocus 'grand Maître' Growth and Care
17,000 local species +400,000 global species studied
Nearly 5 years of research
80+ scholars in botany and gardening
Continue reading in our app - it's better
A database of 400000+ plants unlimited guides at your fingertips...
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