Ornamental · Violaceae
Viola
Viola cornuta
Set out in cool weather, violas lend a doorway or window box months of cheerful, edible color.
Full sun
39–70°F · 4–21°C
USDA 6–11
6–10 in · 15–25 cm
Overview
A viola has a quiet way of lifting a space. A low, tufted member of the violet family, it scatters small flowers in almost any shade, which makes it a natural for the front-step pot, the window box, or the container grouping that greets you each morning. It asks little and gives a garden a settled, cared-for look.
Viola is really a family affair, a spread of close relatives that share a season. The bedding violas mass their small blooms into a soft carpet of color, the larger pansies bring the same charm at a bolder scale, and the wild Johnny-jump-up drifts its tricolor faces through a planting and sows itself where it pleases. What unites them is timing: they belong to cool weather and take their leave as summer warms.
Few plants slip so easily into a daily routine. Set them by a door or along a path, keep the soil moist, and give them sun or a little shade, and they hold their color for months with only the odd tidy-up. There is a table-side bonus, too, since the flowers are edible and carry the same easy elegance from the border onto a plate.
Care
The short version: full sun to part shade, steady moisture in rich, well-drained soil, a light monthly feed, and regular deadheading keep the cool-season display looking its best.
Light
Violas look their best in full sun through the cool months, though they settle happily into partial sun or partial shade. As the season warms, a spot with afternoon shade keeps a planting fresh for longer.
Water
Keep the soil steadily moist but never waterlogged and a display stays full and even. Soggy ground invites crown and root rot, so water consistently and let the excess drain freely.
Soil
Plant into moist, fertile, well-drained soil enriched with organic matter for a container or bed that carries the season. The one thing to avoid is waterlogged ground, which the roots will not tolerate.
Temperature
These are cool-season plants, at their best between 39°F to 70°F (4°C to 21°C). They take a light frost in stride but lose their poise once summer heat arrives.
Humidity
Everyday outdoor humidity suits them, so there is no level to manage. Airflow counts for more, since crowded, damp foliage invites downy mildew that dulls a planting.
Feeding
Feed lightly through the growing season, about once a month, with a balanced fertilizer. Keep the nitrogen modest, since too much trades flowers for leaves and softens the display.
Pruning
Regular deadheading keeps a planting tidy and flowering far longer. The Johnny-jump-up types reseed themselves, so leave a few blooms if you like the look of volunteers drifting back next year.
Size & spacing
Violas stay low and neat at 6 to 10 inches (15 to 25 cm) tall and 8 to 12 inches (20 to 30 cm) across. That compact scale is what makes them so easy to place, whether edging a bed, filling a window box, or finishing a pot.
When to plant
Violas keep to the gentler ends of the year rather than high summer, which suits a seasonal display that turns over with the calendar. Start seed indoors in late winter or sow outdoors in late summer, set plants out in early spring or fall while the air stays cool, and enjoy the color through spring and fall, often carrying over winter in the mild zones 6 through 11.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 8 to 10 weeks before transplanting out in cool weather
- Plant: Early spring or fall while temperatures are cool
- Harvest: Spring and fall in cool weather; may persist over winter in mild climates and declines in summer heat
Hardiness
USDA hardiness zones: 6–11
Temperature: down to -23°C
Troubleshooting
Most viola troubles trace back to soggy soil or the turn toward summer heat, and both announce themselves early on the leaves and flowers. Notice the first signs and a quiet intervention usually keeps the display intact. Match what you see below, then act while it still makes a difference.
Plants wilt and collapse with a blackened base
When soil stays soggy, crown and root rot takes hold and a plant can fold almost overnight. Lift one and the roots come away mushy and discolored, with decay at the soil line. An affected plant cannot be saved, so remove it, put the drainage right before replanting, and ease back on the watering.
Fix:
- Remove and discard affected plants
- Improve drainage before replanting
- Reduce watering frequency
Ragged holes in leaves or curling new shoots
The same cool, damp weather that flatters a viola planting draws two pests. Slugs rasp ragged holes after dark and leave shining trails, while aphids gather on the tender shoots and twist the buds. Hand-pick the slugs or set traps, rinse the aphids off with a firm jet of water, and turn to insecticidal soap only when a colony spreads.
Fix:
- Hand-pick slugs or use traps and barriers
- Knock aphids off with a strong spray of water
- Apply insecticidal soap to heavy aphid infestations
Yellow patches above with gray fuzz beneath
This is downy mildew, which settles in when the weather stays cool, wet, and humid. Turn a marked leaf over and a grayish to purple fuzz shows beneath the yellow patches. Strip off the affected leaves, open the planting so air can move, and water at the base in the morning to keep the foliage dry.
Fix:
- Remove and discard infected foliage
- Improve air circulation and reduce leaf wetness
- Avoid overhead watering
Leggy, sparse plants as summer heat builds
Violas are cool-season plants, so summer heat draws them out and thins the flowers once warm weather settles in. A light shearing with some deadheading can coax a final flush, and afternoon shade with steady moisture buys a little more time. In most gardens the graceful move is to lift them, bring in summer annuals, and plant fresh violas in fall.
Fix:
- Deadhead and shear lightly to encourage rebloom
- Provide afternoon shade and consistent moisture
- Replace with summer annuals once spent
Toxicity
There is real ease in growing violas around a household. The ASPCA lists the plant as non-toxic to cats, dogs, and horses, and the flowers are edible for people, so they belong just as comfortably on the dinner table as by the front door.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
An easy plant to keep around cats. A nibbled leaf or flower brings no poisoning.
Dogs None
Nothing to guard against with dogs. The plant is non-toxic, so a curious chew does no harm.
Horses None
Listed as non-toxic to horses, so a planting near a paddock poses no concern.
Rabbits Safe
Rabbits can browse the leaves and flowers without any trouble.
Livestock Safe
Cattle, goats, and sheep can graze around violas without risk.
Birds Safe
Garden birds and poultry can peck at the plant in safety.
People Safe
The flowers are edible and a favorite garnish, so the whole plant is safe for people, children included.
Varieties
Hundreds of violas exist, yet a few series and enduring favorites keep earning their place in gardens and containers. These are the ones worth knowing when you plan a planting.
'Sorbet' series
A compact, free-flowering bedding viola bred for cold tolerance and early bloom across a wide palette of colors.
'Penny' series
A small-flowered viola prized for the even, vigorous way it carries a planting through spring and fall.
Johnny-jump-up (Viola tricolor)
A tricolor charmer in purple, yellow, and white that self-sows freely and drifts naturally through a garden.
'Etain'
A fragrant, more perennial viola with soft creamy-yellow flowers edged in lavender.
How to propagate
Violas increase without fuss, whether you raise a tray from seed, lift and split an established clump, or root a handful of cuttings for next season's pots.
SeedEasy
Sow indoors 8 to 10 weeks before transplanting in cool weather, or direct sow in late summer for fall and spring bloom · 6 to 10 weeks to transplant size
Seed is the everyday route. Start it indoors 8 to 10 weeks before you plan to set plants out in cool weather, allowing 6 to 10 weeks to reach transplant size, or direct sow in late summer for fall and spring color. The Johnny-jump-up types look after themselves, self-sowing freely once they settle in.
DivisionEasy
Spring or fall · A few weeks
An established perennial clump lifts and splits easily in spring or fall. Ease it apart into sections and replant, and the divisions find their feet within a few weeks.
Stem cuttingsModerate
Spring or early summer · 3 to 4 weeks to root
Cuttings ask for a little more patience. Take tip or basal cuttings from non-flowering shoots in spring or early summer, and they root in about 3 to 4 weeks.
Myths
Violas and pansies are the same plant.
They are close cousins in one genus, though they play different roles in a planting. The viola types, the Viola cornuta forms, carry many more small flowers and take a touch more heat, while pansies offer fewer but far larger blooms. Choose violas for a longer, sturdier display and pansies for scale and presence.
Viola flowers are not fit for the table.
The blooms are edible and appear again and again as a garnish on plates and cakes. The plant is listed as non-toxic across the board. Both the flowers and the plant are safe, so they earn a place wherever people and pets share a home.