To water Cut-leaved dead-nettle, you can use a garden hose with a spray nozzle, a watering can, or just about any other common watering tool. Generally, Cut-leaved dead-nettle is not too picky about how they receive their water, as they can live off of rainwater, tap water, or filtered water. Often, you should try not to water this plant from overhead, as doing so can damage the leaves and flowers and may lead to disease as well. At times, the best method for watering this plant is to set up a drip irrigation system. These systems work well for Cut-leaved dead-nettle as they apply water evenly and directly to the soil. For one Cut-leaved dead-nettle that grows in a container, you can use a similar watering approach while changing the tools you use. To water a container-grown Cut-leaved dead-nettle, use a cup, watering can, or your tap to apply water directly to the soil.

The remedy for underwatering Cut-leaved dead-nettle is somewhat obvious. When you notice that your plant lacks moisture, simply begin watering it on a more regular basis. The issue of overwatering can be a much more dire situation, especially if you fail to notice it early. When your Cut-leaved dead-nettle is overwatered, it may contract diseases that lead to its decline and death. The best way to prevent this outcome is to choose a proper growing location, one that receives plenty of sunlight to help dry the soil and has good enough drainage to allow excess water to drain rather than pooling and causing waterlogged soils. If you overwater your Cut-leaved dead-nettle that lives in a pot, you may need to consider changing it to a new pot. Your previous container may not have contained soil with good drainage or may not have had sufficient drainage holes. As you repot your overwatered Cut-leaved dead-nettle, make sure to add loose soils and to use a pot that drains efficiently.

Cut-leaved dead-nettle needs water regularly throughout the growing season. Beginning in spring, you should plan to water this plant about once per week. As the season presses on and grows warmer, you may need to increase your watering rate to about two to three times per week. Exceeding at this rate can be detrimental to your Cut-leaved dead-nettle. With that said, you should also ensure that the soil in which your Cut-leaved dead-nettle grows remains relatively moist but not wet, regardless of how often you must water to make that the case. Watering Cut-leaved dead-nettle that lives in a pot is a bit different. Generally, you'll need to increase your watering frequency, as the soil in a pot can heat up and dry out a bit faster than ground soil. As such, you should plan to water a container-grown Cut-leaved dead-nettle a few times per week in most cases, versus just once per week for an in-ground plant.

There are a few different ways you can go about determining how much water to give to your Cut-leaved dead-nettle. Some gardeners choose to pick their water volume based on feeling the soil for moisture. That method suggests that you should water until you feel that the first six inches of soil have become moist. Alternatively, you can use a set measurement to determine how much to water your Cut-leaved dead-nettle. Typically, you should give your Cut-leaved dead-nettle about two gallons of water per week, depending on how hot it is and how quickly the soil becomes dry. However, following strict guidelines like that can lead to overwatering if your plant requires less than two gallons per week for whatever reason. When growing Cut-leaved dead-nettle in a container, you will need to use a different method to determine how much water to supply. Typically, you should give enough water to moisten all of the layers of soil that have become dry. To test if that is the case, you can simply stick your finger in the soil to feel for moisture. You can also water the soil until you notice a slight trickle of excess water exiting the drainage holes of your pot.

It can be somewhat difficult to avoid overwatering your Cut-leaved dead-nettle. On the one hand, these plants have relatively deep roots that require you to moisten the soil weekly. On the other hand, Cut-leaved dead-nettle are plants that are incredibly susceptible to root rot. Along with root rot, your Cut-leaved dead-nettle may also experience browning as a result of overwatering. Underwatering is far less likely for your Cut-leaved dead-nettle as these plants can survive for a while in the absence of supplemental watering. However, if you go too long without giving this plant water, it will likely begin to wilt. You may also notice dry leaves.

You can expect your Cut-leaved dead-nettle’s water needs to increase as the season moves on. During spring, you should water about once per week. Then, as the summer heat arrives, you will likely need to give a bit more water to your Cut-leaved dead-nettle, at times increasing to about three times per week. This is especially true of Cut-leaved dead-nettle that grow in containers, as the soil in a container is far more likely to dry out faster than ground soil when the weather is warm. In autumn, while your Cut-leaved dead-nettle is still in bloom, it may need a bit less water as the temperature has likely declined, and the sun is no longer as strong as it was in summer.

Cut-leaved dead-nettle will move through several different growth stages throughout the year, some of which may require more water than others. For example, you will probably start your Cut-leaved dead-nettle as a seed. While the seed germinates, you should plant to give more water than your Cut-leaved dead-nettle will need later in life, watering often enough to maintain consistent soil moisture. After a few weeks, your Cut-leaved dead-nettle will grow above the soil and may need slightly less water than at the seedling phase. Then, once this plant is mature, you can begin to use the regular watering frequency of about once per week. As flower development takes place, you may need to give slightly more water to aid the process.

There are several reasons why most Cut-leaved dead-nettle grow outdoors rather than indoors. The first is that these plants typically grow to tall. The second reason is that Cut-leaved dead-nettle needs more daily sunlight than most indoor growing locations can provide. If you are able to provide a suitable indoor growing location, you may find that you need to give your Cut-leaved dead-nettle water a bit more often than you would in an outdoor growing location. Part of the reason for this is that indoor growing locations tend to be a lot drier than outdoor ones due to HVAC units. The other reason for this is that soil in containers can dry out relatively quickly as well compared to soil in the ground.

You must expose the plants to at least 6 to 8 hours of sunlight daily. They prefer more exposure to the morning light, especially in the summer. The Cut-leaved dead-nettle needs full sun and more sunlight that it can get. The more light these species get, the more they can manufacture food, produce beautiful blooms, and survive.

The Cut-leaved dead-nettle grows best under full sunlight. It's best not to crowd them together so they can get exposure to the sun evenly. The leaves shouldn't be starved with sunlight. If planted in pots, try to expose the herbaceous flowers in windows with direct sun and ensure they receive full sunlight regardless of the months.

They don't tend to do well in partial or filtered light as this will not produce strong stems and healthy flowers. It's best if the Cut-leaved dead-nettle is always exposed to the sun.

When the temperature rises above 90℉(32℃), the Cut-leaved dead-nettle can get damaged by extreme temperatures, especially if they are exposed to many hours of sun. It's always ideal for providing some shade from the light in the afternoon in the summer. It's always important to keep in mind that the sunlight in the summer is stronger than the one in the winter. Sunlight exposure is also 50% longer in the summer than in the winter.

If the Cut-leaved dead-nettle is too stressed with sunlight, you might want to keep them fully hydrated. Water them when the top of the soil is about 2 inches dry, and move the plants indoors if it's too hot outside. This is the case if they are planted in containers.

It can be normal for the plant leaves to wilt during the day. Generally, they can recover at night. However, when you notice that the Cut-leaved dead-nettle is still drooping, this means that the plant is losing water fast, and you need to water them.

The Cut-leaved dead-nettle does not need any protection from the sun. In fact, they love the sun, and some species are heliotropic. Plant them in south-facing gardens whenever possible so they can be exposed from morning to afternoon. While the sun can benefit them, some may experience a sunburn. You might offer protection from the afternoon and midday sun through a shade of a tree or a wall.

Growing the Cut-leaved dead-nettle in shady areas is impossible because the larger flowers would require a lot of energy to grow and produce. Always provide the lighting conditions and set them in an area with full sun for best results.

When the Cut-leaved dead-nettle does not get adequate sunlight, or they are not placed in full sun locations, it's worth noting that the photosynthetic process will slow down. A lack of sunlight will cause the stems to become more leggy since they become thin and long since they tend to seek too much sunlight. They will not bloom and produce seeds in the shade.

Inadequate sunlight will also mean that the older leaves can die, the color of the new ones is lighter than the old foliage, and the new growth is smaller than the last ones.

The Cut-leaved dead-nettle indeed loves the sun so much. However, they can wilt when exposed to excessive heat and ultraviolet light during the extreme summer months, so be careful. You might want to cover them with a net that has a green shade, especially in the summer, to prevent the leaves and the flowers from scorching. When they are indoors, reduce the heat with the help of a fan.

When the Cut-leaved dead-nettle is growing, they need more light than their mature counterparts. The younger ones should receive adequate light, but they might not be prepared for sudden full sunlight, especially if they are grown in a nursery. They can be more sensitive to the summer sun, so the lighting should be gradual and slow.

During summer or late spring, the Cut-leaved dead-nettle needs 6 to 8 hours of direct light every single day. This is whether they are planted outdoors. If the Cut-leaved dead-nettle is planted in pots or you're growing them in the winter, they need direct fluorescent lights that help them grow better. Make sure to place them in an indoor area where they are facing south or east so they can have enough sunlight for photosynthesis.

When transplanting the plants, they should not be exposed to sudden sunlight. Give the Cut-leaved dead-nettle to grow and mature before transplanting outside. Some species of herbaceous plants can grow taller and might cast a shade on other young plants. Allow between 80 to 100 days of growing season before planting another batch to ensure that every plant receives more than enough sunlight for at least 6 hours a day.

Make sure that the Cut-leaved dead-nettle receives the best light possible, especially if it's planted in a nursery. These are sun-loving plants, but too much sunlight with a very hot temperature is also detrimental to their growth. Indoor lights should be replaced with natural sunlight as much as possible since these species crave this every day.

Cut-leaved dead-nettle prefers cooler weather, and has a specific temperature range you can keep it within to maximize growth. For Cut-leaved dead-nettle to be as healthy as it possible can, you could keep them between the temperatures 65~75℉(18~25℃). Cut-leaved dead-nettle can handle higher and lower heat levels, but whenever possible, try to keep the area you grow them in within several degrees of 65~75℉(18~25℃).

If you can’t keep Cut-leaved dead-nettle precisely within that range, it doesn’t mean they will stop growing. Cut-leaved dead-nettle can handle a higher and lower range before they begin to suffer damage or reduced growth. On the higher end, that temperature would that would fall between 75~85℉(25~30℃). On the lower end, Cut-leaved dead-nettle can handle temperatures as low as 5℉(-15℃). The higher temperature range is the most important to observe, as Cut-leaved dead-nettle prefers cooler environments. Letting temperatures get above the upper range may cause growth to slow, and having Cut-leaved dead-nettle above 85℉(30℃) could result in the plant dying.

Too much heat early in the growing stages of Cut-leaved dead-nettle may give it an unhealthy appearance, so it's important to keep your growing space between 65~75℉(18~25℃). You’ll want to stay in the colder part of this range as Cut-leaved dead-nettle, but make sure not to go below -5℉(-20℃). Extremely cold temperatures can hinder growth at any stage for Cut-leaved dead-nettle, though they aren’t nearly as damaging as extremely hot temperatures. If temperatures are kept high during the budding stage, Cut-leaved dead-nettle may not flower at all.

Tip #1: Grow in the Coldest Room of Your Home

If you plan to grow Cut-leaved dead-nettle indoors, make sure to choose the coldest room of your home. This will usually be on the side of your house that doesn’t experience the harsh heat that the sun can produce in the middle of the day. At the same time, you’ll need to ensure the room does get a healthy amount of sunlight. While you’ll want to spare your plants from the brightest and hottest part of the day, zero sunlight can drastically reduce Cut-leaved dead-nettle ability to grow.

Tip #2: If Cut-leaved dead-nettle Doesn’t Flower Properly, It May Be Too Hot

The growing season for Cut-leaved dead-nettle, spring and early summer, can occasionally come with high temperatures. These fluctuations can negatively affect the growing stage of Cut-leaved dead-nettle, causing flowering buds to change into non-flowering buds. These buds will open partially, or in some cases not at all, causing Cut-leaved dead-nettle to lose some of its aesthetic quality. It's important to stay in the range of 65~75℉(18~25℃), for that reason, so your Cut-leaved dead-nettle can flower to its full potential.

Tip #3: Avoid Frost

While Cut-leaved dead-nettle can tolerate lower temperatures, as low as -5℉(-20℃), it will not do well if it encounters significant frost. If left out in the colder temperatures of late fall or winter, Cut-leaved dead-nettle will begin to show the signs of frost damage. To recognize the signs of frost damage, you’ll look for several key aesthetic changes. First, parts of Cut-leaved dead-nettle will begin to wilt. Then, those sections will start to become discolored, eventually turning brown or black as they die. Any parts of Cut-leaved dead-nettle that turn these colors cannot be saved, and will have to be pruned if you intend to keep the plant alive.

It's important to keep the temperature of your growing area steady regardless of season. If you live in an area with harsh winters or very hot summers, it may be best to put your plants inside. That way, you can keep them in a cool room where Cut-leaved dead-nettle would be able to grow in the best possible conditions.

If you do leave your plants outside, make sure to observe the temperature closely. If the summer’s get especially hot in your climate-zone, make sure that your plants aren’t exposed to temperatures above 85℉(30℃). This will dehydrate and damage Cut-leaved dead-nettle quickly, and before long, they will begin to die.

If you intend to place Cut-leaved dead-nettle outside, you’ll want to make sure that it has shade from the heat of the midday sun. While Cut-leaved dead-nettle does need plentiful sunlight to grow to its full potential, direct sunlight can cause a rise in temperature and damage certain elements of the plant. Choose an area that has shade providing structures or tall trees that can shield Cut-leaved dead-nettle from the hottest parts of the day.

If your climate isn’t appropriate for Cut-leaved dead-nettle or you don’t have the proper space in your garden, you can also plant them inside. Controlling the temperature is much easier indoors, and having proper fans, ventilation, or an A/C unit will allow you to stay within the optimum range of 65~75℉(18~25℃).