How to care for pansies in the garden and pots

Pansies flower from autumn to late spring and tolerate temperatures down to -10°C, when almost every other flower has given up. They fill pots, window boxes, hanging baskets and beds with their velvety flowers, which often seem to have a "face", and with around 500 varieties in every colour and combination they are among the most popular cool-season bedding plants. Pansies are planted mainly in autumn, need well-drained soil and regular watering, flower for longer when faded blooms are removed, and their flowers are edible when the plants have not been sprayed.

What pansies are

The pansy of the garden centre is Viola × wittrockiana, a hybrid first bred in the 19th century from several Viola species, including the wild pansy, Viola tricolor, also called heartsease. Its name comes from the French pensée, thought, which is behind the pansy's traditional symbolism of remembrance.

Pansies form low, dense plants 15 to 25 cm tall, with flowers 5 to 10 cm across in the large-flowered types, in yellow, orange, red, burgundy, purple, blue and white, often with a dark central blotch. Botanically they are perennials, but they are grown as annuals or biennials because they do not survive hot summers, and the ideal range for pansy growth and flowering is about 14 to 21°C, with heat above 30°C damaging growth and bloom. The sweet violet, Viola odorata, belongs to the same genus but is a shade-loving perennial with small fragrant flowers.

Pansy types and varieties

Type	Features	Best for
Garden pansy (Viola × wittrockiana)	The classic pansy, with large flowers 5 to 10 cm across	Beds, window boxes, pots
Viola or tufted pansy (Viola cornuta)	Smaller flowers 2.5 to 4 cm, many more per plant, better rain tolerance	Hanging baskets, edging, small pots
Wild pansy or heartsease (Viola tricolor)	The ancestor, with small three-coloured flowers in blue, yellow and white	Wildlife gardens, self-seeding, edible use

Sources: Royal Botanic Gardens Kew, University of Missouri Extension.

Pansies and violas differ in how their petals point

All pansy and viola flowers have five petals, two upper, two side petals and one lower petal. In pansies the two side petals tilt upwards, so the flower shows four petals pointing up and one pointing down, while in violas the side petals tilt downwards and the flowers are smaller.

In University of Georgia trials, violas outperformed pansies overall, filling space faster, looking better earlier, showing more colour and tolerating more cold, although consumers still buy more pansies. For a showy display pansies win on flower size, while violas are the safer choice for long, cold winters and exposed pots.

When pansies flower and when to plant them

Pansies flower from autumn to late spring, peaking when nights are cool and days fairly warm. They are also tolerant of city air pollution and of less than ideal irrigation water, which makes them a good choice for urban balconies.

Season	What to do	Result
Late summer to early autumn	Sow in seed trays	Flowering plants during autumn
Autumn	Plant out ready-grown plants, the best time	Flowers through winter and spring
Late winter to early spring	Second chance to plant	Spring flowers until the first heat

In climates with cold winters and cool summers the calendar shifts, with spring planting for summer flowers.

Pansies need sun and well-drained soil

Pansies need a sunny or partly shaded position to flower well, with protection from the hot midday sun in late spring. Drainage is critical, because pansies are sensitive to waterlogging and wilt quickly in soggy soil, so in heavy soil they do better in raised beds and in containers with plenty of drainage holes. They prefer rich, fertile, slightly acidic soil with a pH of 5.4 to 6. Above pH 5.8 iron and boron deficiencies appear, while below 5.3 magnesium deficiency is more common, with yellowing foliage and weak growth.

Pansy seed needs darkness to germinate

Sowing takes place from late summer to early autumn for autumn flowers, or in early spring. The ideal germination temperature is 7 to 18°C. Pansy seed is tiny, about 750 seeds per gram, and needs darkness to germinate, so it is covered with compost and the tray is kept in a cool, shaded place. Germination takes one to three weeks, usually around 15 days, and seedlings are moved to their final position once they have 3 to 5 leaves. About 120 days pass from sowing to the start of flowering.

By nature pansies are biennials, producing foliage in the first year and flowers in the second, but modern commercial hybrids flower in their first year. Where pansies grow, seed that drops to the ground often gives new plants the following year.

Planting pansies in beds and pots

Most people buy ready-grown plants from garden centres in autumn for instant colour. Choose vigorous plants with plenty of buds that are not yet fully open, because they establish better and flower more. Before planting, remove yellowed leaves and faded flowers, take the plants out of their pots and gently loosen the roots.

In beds, plants are spaced 15 to 25 cm apart, in a hole slightly wider than the root ball and at the same depth. In pots, a good all-purpose potting compost is enough, and a pot 15 to 20 cm across takes 4 to 8 plants for a full look from day one. Pansies combine well with other cool-season plants such as chrysanthemums, cyclamen, dianthus and dusty miller, and they are a classic choice for hanging flower baskets.

Watering keeps pansies flowering

Pansies need a lot of water. Beds are watered two or three times a week and pots every two or three days depending on the weather, so the compost stays moist but never soggy. Watering continues in winter when it does not rain, because dry soil stops flowering. If plants look weak or flowers become fewer while the weather is suitable, more frequent watering is the first thing to try.

Feeding follows the cold soil

Because pansies grow at a time of cold soil, they benefit from feeding suited to low temperatures. In beds, a slow-release granular fertiliser such as 15-9-12 is worked into the top 5 to 7.5 cm of soil at planting. In pots, soluble fertilisers work better, applied every two to four weeks throughout flowering. If yellowing appears despite regular feeding, soil pH and a lack of micronutrients are usually the cause, so a product with trace elements is worth adding.

Deadheading extends flowering

The most effective way to keep pansies full of flowers all season is to remove faded blooms regularly before they set seed. The flower stalk is cut as low as possible without damaging the leaves. Spent flowers are easy to spot, because after pollination they form a small green "ball" in the centre that holds the seeds, while fresh flowers keep their petals in a tighter, firmer arrangement.

Pansy flowers are edible only from unsprayed plants

Pansy flowers are edible and are used to decorate dishes, salads, desserts and drinks, fresh or dried. One strict rule applies, however. Only flowers from plants grown without plant protection products are edible, meaning your own unsprayed plants or certified edible flower production. Ornamental plants and cut flowers from the trade are not eaten, because they may have been sprayed. The same rule applies to violas and to sweet violets.

Pests and diseases

The main garden pests of pansies are snails, slugs, several caterpillars and aphids, with many aphid species attacking mainly the tender new growth of spring. Chemical control has low success and is not preferred. A healthy, diverse garden that hosts beneficial predators such as ladybirds and parasitic wasps works better, while snails and caterpillars are removed by hand.

Root rots, downy and powdery mildew and rust affect pansies in both beds and pots, while black or brown leaf spots point to fungal infection. Control relies on prevention, meaning healthy plants, clean compost, good drainage and removing infected plants. Because pansies are cheap and seasonal, badly affected plants are usually replaced.

Frequently asked questions

When should pansies be planted?

Mainly in autumn, for flowers through winter and spring. A second chance comes in late winter and early spring, for spring flowers until the first heat.

Can pansies survive frost and snow?

Yes. Pansies are among the hardiest cool-season flowers and tolerate temperatures down to -10°C. Mature, well-established plants survive frost and snow, while young plants need a more sheltered spot.

Why have my pansies stopped flowering?

The commonest reasons are dry soil, lack of feeding and faded flowers left on the plant to set seed. In late spring, rising temperatures end the plant's cycle naturally.

What is the difference between pansies and violas?

Pansies have larger flowers, 5 to 10 cm, with the side petals tilting up, so four petals point up and one down. Violas have smaller flowers, 2.5 to 4 cm, but many more per plant, with the side petals tilting down, and in trials they tolerated cold better.

Are pansies edible?

Yes, as long as they come from unsprayed or certified edible production. Ornamental plants from the trade are not eaten, because they may have been sprayed.

Are pansies perennials?

Botanically yes, but they are grown as annuals or biennials because they do not survive hot summers. Where they grow, dropped seed often produces new plants the following year.

Important notes

Every plant and every environment is unique. Conditions vary considerably with region, exposure, water quality, soil pH and the overall health of the plant. The guidance above is general and a starting point.

If you suspect a serious nutrient deficiency or a disease that basic practices do not resolve, contact an agronomist for an accurate diagnosis.

Plant protection products should be used carefully and responsibly. Always try non-chemical methods first (cultural practices, soft soap, summer oil). When chemical intervention is needed, use only approved products and follow the label instructions.