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Compact perennial horned viola with nearly black flowers
Violaceae
Dark-flowered perennial violas
Bowles Black viola
Viola cornuta
Bowles Black is a compact perennial viola with velvety deep purple flowers that appear nearly black around a bright yellow eye. The evergreen clump reaches approximately 10 to 15 centimetres tall and 20 centimetres wide. It flowers from spring through fall, especially during cool weather. This black viola prefers fertile, humus-rich, evenly moist and freely draining soil in sun or partial shade. It suits edging, cool rock gardens, flowering ground cover and containers. Its dramatic dark contrast stands out especially well against pale or silver foliage near a path, patio or entrance. For best results, keep soil evenly moist and well drained, then remove faded flowers regularly.
- Quantity
- 1-gallon pot
- Exposure
- Sun to partial shade
- Life cycle
- Hardy perennial
- Hardiness
- Zone 3 to Zone 8
Discover the plant
Common nameBowles Black viola
FamilyViolaceae
GenusViola
Speciescornuta
CultivarBowles’s Black — RHS accepted name
TypeCompact perennial horned viola with nearly black flowers
Botanical nameViola cornuta
Bowles Black Viola (Viola cornuta ‘Bowles Black’) forms a small compact evergreen clump. Simple flowers are velvety deep purple, appearing almost black, with a bright yellow eye that sharpens their dramatic contrast. The RHS accepts the name ‘Bowles’s Black’ and also lists Viola cornuta ‘Bowles’ Black’ as a synonym. The exact phrase bowles black viola directly identifies this historic selection popularized by British gardener E. A. Bowles. Plants reach approximately 10 to 15 centimetres tall and spread about 20 centimetres, a useful scale for front edges, cool rock gardens and smaller containers.
This perennial viola flowers over a long season, generally from spring through fall while temperatures remain cool. Plant it in sun or partial shade in fertile, humus-rich, evenly moist and freely draining soil. Water when the surface begins to dry, without leaving the roots standing in water. Remove faded blooms regularly to encourage new buds, then trim the clump lightly if growth becomes loose. Watch for slugs, snails, aphids and foliar diseases. Good air movement and morning watering reduce the time leaves remain wet. A light balanced feeding supports bloom without producing excessively soft growth.
North American catalogues place Bowles Black in USDA Zones 3 to 8, while the RHS gives it an H5 hardiness rating. No exact minimum temperature is inferred from the zone. Use this black viola along an edge, in a cool rock garden, a window box or beneath shrubs in light shade. Combine it with pale daffodils, blue grape hyacinths, yellow primroses, silver coral bells or small golden grasses. Nearly black flowers stand out especially well against light foliage. The low habit also creates strong colour contrast without hiding neighbouring plants, and regular deadheading keeps the display tidy.
Planting guide
From planting to establishment.
Spacing / density
Space approximately 20 cm apart
Best planting time
Spring or early fall during cool weather
Propagation
Softwood tip cuttings in spring maintain the cultivar
Growing method
Plant Bowles Black during cool spring or early-fall weather. Loosen fertile freely draining soil and incorporate compost. Dig a hole slightly wider than the root ball and keep the crown level with the surrounding ground. Space plants 25 centimetres apart. Water deeply after planting and add thin mulch without covering the centre of the clump. Maintain even moisture while roots establish. Morning sun or partial shade works well; add light afternoon shade during intense heat. Flowers are self-cleaning, although damaged blooms can be removed and stretched stems lightly shortened. Watch for slugs, snails, aphids and leaf spots. Prevent standing water, especially in winter, and never let the root ball dry completely while the plant is flowering. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods. This perennial pansy flowers for a long season when moisture remains even and damaged blooms are removed as needed. A visible position beside a path makes its fragrance and deep velvety purple-black and bright yellow colouring easy to enjoy. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods.
Soil and care
The right care,at the right time.
Soil pH
Mildly acid to mildly alkaline; approximately 6.0 to 7.5
Care level
Low
Watering
Keep soil consistently moist without saturation. Water deeply when the surface begins to dry, then allow excess to drain. Containers need more frequent checks during hot or windy weather. Prevent standing water in winter and avoid repeatedly wetting foliage late in the day because prolonged leaf moisture can encourage disease. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods.
Soil type
Use fertile humus-rich soil that stays consistently moist yet drains freely. Loam amended with compost is especially suitable. Heavy clay should be improved so water cannot stand around the crown, while sandy soil benefits from additional organic matter to retain moisture. A mildly acid to mildly alkaline pH is acceptable. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods.
Fertilization
Bowles Black performs best with regular but light feeding. The breeder recommends fertilizer approximately once a month during active growth. Use a balanced product at a low rate or a slow-release formula according to label directions. Excess nitrogen encourages long stems and abundant foliage at the expense of flowers. Water after application and keep fertilizer away from direct contact with the crown. Container plants may need closer observation because regular watering gradually removes nutrients from the potting mix.
Moisture
Average humidity; prefers moist soil and good air movement
Seasonal care
In spring, remove damaged leaves, replace soil around roots lifted by frost and add a thin compost layer. During flowering, keep soil moist; blooms are self-cleaning, although damaged flowers can be removed. After a major flush, shorten stems extending beyond the clump to preserve a dense dome. In summer, provide light afternoon shade and watch for slugs, aphids and foliar disease. In fall, water when soil is dry, then add thin mulch after the ground cools. Never cover the crown and prevent standing water during winter thaws. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods. This perennial pansy flowers for a long season when moisture remains even and damaged blooms are removed as needed. A visible position beside a path makes its fragrance and deep velvety purple-black and bright yellow colouring easy to enjoy. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods. This perennial pansy flowers for a long season when moisture remains even and damaged blooms are removed as needed. A visible position beside a path makes its fragrance and deep velvety purple-black and bright yellow colouring easy to enjoy. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods. This perennial pansy flowers for a long season when moisture remains even and damaged blooms are removed as needed.
Container growing
A garden,within reach.
Recommended pot size
Freely draining pot at least 15 cm across
Bowles Black performs very well in pots and window boxes because of its compact habit and fragrant flowers. Choose a container at least 20 centimetres across with several drainage holes. Fill it with quality container mix amended with compost and keep the crown level with the surface. Position the pot in morning sun or partial shade beside a path where fragrance can be enjoyed. Water until excess drains whenever the surface begins to dry. Moderate diluted fertilizer is sufficient during active growth; avoid excess nitrogen. Remove damaged flowers and lightly shorten stems extending beyond the clump. For a Quebec winter, group and insulate pots or move them to a cold location protected from wind. Keep the root ball slightly moist without saturation because an unprotected container freezes more deeply than open ground. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods. This perennial pansy flowers for a long season when moisture remains even and damaged blooms are removed as needed. A visible position beside a path makes its fragrance and deep velvety purple-black and bright yellow colouring easy to enjoy. outdoors.
Bloom and dimensions
Its place,in your garden.
Mature height
4 inches (10 cm)
Width / spread
8 inches (20.5 cm)
Flower color
Velvety deep purple, nearly black, with a bright yellow eye
Foliage color
Green
Foliage type
Evergreen
Growth rate
Moderate
Growth habit
Compact, bushy and clump forming
Fragrance
Unconfirmed
Bloom period
Bowles Black carries abundant simple flowers in velvety deep purple, appearing nearly black around a bright yellow eye. Bloom begins in spring and can continue through fall, with the strongest flushes during cool weather. Even moisture, light feeding, removal of faded blooms and occasional trimming support renewed bud production. Gentle sun or partial shade helps the dramatic dark colouring remain rich while protecting the compact foliage during warmer periods.
Garden associations
In goodcompany.
Companion plants
Combine Bowles Black with pale daffodils, blue grape hyacinths, yellow primroses, forget-me-nots, silver coral bells, small ferns and golden sedges. These plants highlight the deep purple-black flowers and yellow eyes and also appreciate moist soil or partial shade. Keep highly vigorous companions away so they cannot cover the low clump. Spacing plants approximately 20 centimetres apart improves air movement and lets the cushion spread naturally throughout its long flowering season. For best results, keep soil evenly moist and well drained, then remove faded flowers regularly.
Plants to avoid
Avoid highly invasive ground covers, tall plants creating dense shade and companions adapted to constantly dry soil.
Frequently asked questions
Your questions,answered.
Will Bowles Black return after winter?
Yes. Breeder catalogues list Bowles Black as a perennial for USDA Zones 3 to 8. No exact minimum temperature is inferred from that zone. Quebec winter survival depends especially on drainage, snow cover and freeze-thaw cycles. Choose a sheltered site where water cannot stand. After soil cools, apply light mulch without covering the centre of the clump. An exposed container freezes more deeply than open ground, so group and insulate pots or move them to a cold protected location. Appropriate care cannot guarantee survival after every unusually severe or snowless winter. For best results, keep soil evenly moist, provide effective drainage and remove faded flowers regularly.
What light is best for this perennial pansy?
In Quebec, morning sun, filtered sun or partial shade generally gives good results. The Bowles Black selection handles heat better than many pansies, but light shade during hot, dry periods helps flowers keep their quality. Full sun is possible in a cool site where soil remains moist. Avoid a wall that stores intense heat when regular watering is not available. Watch the plant: flowers fading rapidly, wilted foliage or interrupted bloom indicate that additional protection from heat would be useful. Too much dense shade can reduce flowering, so aim for bright conditions rather than a dark enclosed position. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods.
Can Bowles Black grow in a pot?
Yes. Its compact habit suits pots, window boxes and baskets very well. Select a container at least 20 centimetres across with several drainage holes. Use container mix amended with compost and keep the crown level with the surface. Water until excess drains whenever the upper layer begins to dry. A position beside a path makes the fragrance easy to enjoy, while light afternoon shade protects flowers during heat waves. For a Quebec winter, protect the root ball from deep freezing and prevent the container from remaining filled with water. An unprotected pot is less reliable than the same cultivar planted in well-drained ground.
How can its flowering season be extended?
Keep soil consistently moist without saturation and protect the plant from scorching afternoon sun. Flowers are described as self-cleaning, although damaged blooms can be removed to maintain a neat appearance. If selected stems stretch after the first flush, shorten them lightly with clean scissors. A small amount of compost or balanced slow-release fertilizer in spring is generally sufficient. Avoid nitrogen-rich feeding that promotes foliage instead of buds. A pause during intense heat is normal, and bloom may resume when temperatures decline. Good drainage and regular moisture are more useful than frequent heavy fertilizer. For best results, keep soil consistently moist, provide effective drainage and offer light shade during hot, dry periods.
Is Bowles Black pansy suitable for a garden visited by pets?
Garden pansies are generally considered non-toxic to dogs and cats, making Bowles Black a suitable choice for an outdoor space visited by pets. Eating a large amount of plant material can still cause digestive discomfort even when a plant is non-toxic, so pets should not be encouraged to graze on flowers or foliage. Keep fertilizer, slug pellets and other garden treatments out of their reach as well. If an animal eats a substantial amount or develops unusual symptoms, contact a veterinarian and provide the name Viola cornuta ‘Bowles Black’. Individual sensitivities can vary, and professional advice is always appropriate when symptoms appear.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Fragrant flowers can attract butterflies, bees and other small pollinators from spring through fall. Place several plants beside other seasonal flowers to provide a succession of resources. Avoid insecticides on open blooms and accept minor damage when supporting beneficial garden wildlife. Hummingbirds and seed-eating birds are not primary visitors.
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