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Home > Plant Care Guide > Cultivar

Petunias 'Supertunia Royal Magenta' (Petunia 'Supertunia Royal Magenta') Care Guide

Petunias 'Supertunia Royal Magenta' is not difficult to grow or maintain and presents no particular challenges provided the soil is kept reasonably dry. Petunias 'Supertunia Royal Magenta' is used for its delicate, colorful flower booms, pleasing scent and its flowering duration which lasts from spring until frost. They make excellent bedding and container plants.

Quick Care Guides

  • How much sunlight is needed to grow petunias 'Supertunia Royal Magenta'?
  • How much and how often should I water my petunias 'Supertunia Royal Magenta'?
  • How to stop the pests of petunias 'Supertunia Royal Magenta'?
  • Where can I grow my petunias 'Supertunia Royal Magenta'?

Condition Requirement

Water and Hardiness

On account of its South American origins, petunias 'Supertunia Royal Magenta' can tolerate high temperatures but will not tolerate frost. Though classed as tender perennials, most petunias 'Supertunia Royal Magenta' will not survive winter conditions and live as annuals. They are not a hardy genus and will only survive in a warm area. Night-time temperatures should stay above 14 ℃ and daytime temperatures above 16 ℃.
Petunias 'Supertunia Royal Magenta' likes moist substrate but does not tolerate waterlogging, because soggy soil will cause root rot.

Sunlight

The most important factor in growing of petunias 'Supertunia Royal Magenta' is sunlight. Petunias 'Supertunia Royal Magenta' needs at least five hours of sunlight per day. They will thrive best and grow the most flowers with exposure to full, all-day sunlight. The plants will grow in partial shade but will have fewer flowers. Lack of sunlight may also lead to leggy plants and a lack of healthy flowering.
Petunias 'Supertunia Royal Magenta' seeds require plenty of sunlight for germination. Be sure to plant or prepare seed trays somewhere with plenty of exposure to sunlight.

Soil

Petunias 'Supertunia Royal Magenta' will thrive best in fertile soil with high organic matter content such as peat moss, well-decomposed compost or manure. If potting, soil needs to be lightweight to allow water to drain away. Dense soil with poor drainage is easy to accumulate water, making petunias 'Supertunia Royal Magenta' roots wet and causing them to rot away. As with many ornamental plants, petunias prefer slightly acidic soil (pH 6.0–7.0).

Care Guide

Planting

Petunias 'Supertunia Royal Magenta' can be grown from seed though growing from transplants is easier. Transplants should be positioned in light, well-drained soil with exposure to full sun shortly after the last frost in spring.
If growing from seed, start the seeds indoors 10-12 weeks before taking them outside. The seedlings can be taken outside once they have three leaves, and the placing of plastic wrap over the seedlings outdoors will help keep temperature and humidity constant to help in their development.
Whether growing from seed or transplanting petunias 'Supertunia Royal Magenta', a location should be chosen with minimal exposure to wind and each plant given a space of 30 cm. Petunias 'Supertunia Royal Magenta' should not be planted in the area where diseases have once occurred, since they are susceptible to diseases. If planting in pots use a soil-less mix to keep cultivation substrate light petunias 'Supertunia Royal Magenta' free of disease.

Water

Watering of petunias 'Supertunia Royal Magenta' once a week should be sufficient in most conditions but petunias 'Supertunia Royal Magenta' plants in hanging baskets and other containers may require watering more frequently, especially in hot summer. A good watering medium is the use of a fine spray mist applied to soil and foliage to avoid water-logging of soils that can damage roots.

Fertilizer

In summer, a balanced liquid fertilizer contains roughly equal proportions of the three main elements (N%-P2O5%-K2O%) with 8-8-8 or 12-12-12 can be used every two to three weeks. Spreading varieties will respond well to weekly fertilization. Some varieties such as those with double flowers will enjoy twice-weekly doses of fertilizer. If growing petunias 'Supertunia Royal Magenta' in containers or baskets, opt for a time-release fertilizer.
However, care should be taken not to over-fertilize petunias 'Supertunia Royal Magenta', particularly with nitrogen. this can lead to pest and disease issues. Over-fertilization can be identified by petunias 'Supertunia Royal Magenta' leaves turning yellow or brown.

Pruning

During the season, deadhead any flowers which have died to keep the area free of sites which may harbor pests and disease. Petunias 'Supertunia Royal Magenta' flowers die fairly quickly so deadheading should be performed regularly. Doing so will help the growth of new flowers and prolong blooming.

Common Problems

My petunias 'Supertunia Royal Magenta' is wilting. What is the problem?

Petunias 'Supertunia Royal Magenta' may wilt if soils become too water-logged or if they are dry. Too little or too much water will reduce root growth and cause the plants to wilt. If this is noticed, first check to see if the soil is very dry. If so, water the plant. If it is too moist, waterlogging may be the problem. Waterlogging is the most common problem to petunias 'Supertunia Royal Magenta' and will manifest as wilting plants. Soil should be dried out at least once before watering the plants.

My petunias 'Supertunia Royal Magenta' is growing very few or small flowers. What is the problem?

Sometimes, petunias 'Supertunia Royal Magenta' may not flower or grow small, undeveloped flowers. Poor flowering of petunias 'Supertunia Royal Magenta' is most likely to be a lack of sunlight. Consider moving other plants to ensure that the petunias 'Supertunia Royal Magenta' is receiving adequate sunlight.

My petunias have grown leggy with droopy flowers. What should I do?

Petunias 'Supertunia Royal Magenta' stems may sometimes grow long and flowers droop. If this has happened, petunias should be trimmed back in midsummer by removing half of the plant stem’s length using garden shears. this will force the flowers to grow new, more compact stems and full flowers. Remember to put your petunias 'Supertunia Royal Magenta' in a place with plenty of sunlight.

Pests and Diseases

Gray Mold

Grey mold, also known as Botrytis blight, will manifest as spots or discoloration on petunias 'Supertunia Royal Magenta' flowers and leaves that eventually form spores. Unlike other diseases such as crown, root or stem rot, grey mold can be treated through pruning of the affected areas and removing any surrounding soil debris. Watering should also be lightened to help remove moisture from the area. Too much moisture will help the disease to propagate. Once treated, the bed should be dried out at least once to help prevent re-infestation.

Fusarium Wilt

Fusarium wilt affects many plants. In petunias 'Supertunia Royal Magenta', it manifests as yellowing of the leaves. The best prevention is to ensure the planting of disease-resistant varieties at the beginning. However, if suspected, Fusarium wilt can be treated using Mycostop biological fungicide according to manufacturer instructions. If this does not work, be sure to remove the infected petunias 'Supertunia Royal Magenta' and any nearby plants to help reduce the risk of the infection spreading.

Spider Mites

Spider mites are tiny, almost-microscopic cousins of spiders that suck the juices out of flowers such as petunias 'Supertunia Royal Magenta'. They remove nutrients from the plants as well as causing mechanical damage by their sucking action. Mite damage can be identified by the curling up of petunias 'Supertunia Royal Magenta' leaves and petals. These pests can be prevented by applying an oil insecticide to the top and bottom of foliage at the beginning of the season. A horticultural oil-free of petroleum should be used with one tablespoon of the oil mixed into one liter of water. If mites have already taken hold, a weekly spray of neem oil will remove them from the plants.

Thrips

As well as damage caused by thrips themselves, thrips can carry viruses between plants. Thrip damage can be identified by leaves turning dry and papery. It can also manifest through white spots in flowers breaking up the flowers’ colors. As with Mites, a horticultural oil-free of petroleum can be used with one tablespoon of the oil mixed into one liter of water to prevent these pests. If already on the plants they can be treated through a weekly spray of neem oil.

Caterpillars

Caterpillars can cause extensive damage to petunias 'Supertunia Royal Magenta' foliage and flowers in a short space of time. It is difficult to prevent Caterpillars from starting to feed on petunias 'Supertunia Royal Magenta' plants. However once spotted, they can be removed by hand and placed in water to kill them.

Other Uncommon Pests or Diseases

Moreover, there are some less common pests and diseases listed below that need your attention.
  • Powdery Mildew
  • Late Blight
  • Brown Spot
  • Root, Stem and Crown Rots
  • Verticillium Wilt
  • Virus Diseases(Cucumber mosaic virus, Tobacco mosaic virus, Beet curly top virus, Impatiens necrotic spot virus, etc.)
  • Leaf Miners
  • Whiteflies
  • Snails and Slugs
Petunias 'Supertunia Royal Magenta' (Petunia 'Supertunia Royal Magenta') Petunias 'Supertunia Royal Magenta' (Petunia 'Supertunia Royal Magenta')
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