How to Grow Pansies from Seed (Viola × wittrockiana)

Almost everything you have read about starting flower seed is wrong for pansies. Warmth speeds most seed up; above about 22 °C a pansy seed simply refuses. Light helps many small seeds germinate; a pansy wants complete darkness. Most bedding is sown in spring; the best pansies are sown now, in the tail end of summer, to flower through autumn, on every mild day of winter, and again in a great flush next April. Get those three reversals right and Viola × wittrockiana is one of the easiest and longest-flowering plants you can raise from a packet — five months of colour from a sowing that costs less than a single tray of garden-centre plugs.

• Botanical name Viola × wittrockiana
• Sow Jun–Aug for winter & spring; Jan–Mar for summer
• Germination 10–20 days at 15–18 °C, in darkness
• Flowering Oct–May from a summer sowing

Pansy or viola? What you have actually bought

The two names get used interchangeably on labels, and the difference matters more than most people realise. A pansy — Viola × wittrockiana — is a garden hybrid with large flowers, usually 5–8 cm across, made of four upward-facing petals and one broad lower petal, most of them marked with the dark blotch we call the "face". A viola — usually Viola cornuta and its kin, sold as violas, violettas or Johnny jump-ups — carries flowers half the size but three times as many, and shrugs off weather that flattens a big pansy.

If you want a few statement pots by the front door, sow pansies. If you want a low river of colour along a path that keeps going through sleet and never needs staking, sow violas. Most gardeners end up growing both, and our viola seed range and pansy seed range overlap deliberately for that reason.

One more label to decode: packets often say "biennial". Botanically pansies are short-lived perennials, but they are grown as biennials or annuals because the second year is always worse than the first. Treat them as a one-season plant and you will never be disappointed — the same honest framing we apply to the true biennials in our guide to foxglove lifecycles.

When to sow pansies — and why timing is everything

There are two windows, and they produce completely different plants.

Late June to late August is the sowing that most people mean when they say "winter pansies". Seedlings raised now are potted on in September and planted out in early October, in time to make a solid rosette of leaves before the light goes. They flower from mid-autumn, tick over through winter, and explode in early spring. Miss the early-October planting deadline and you will get a plant that survives winter but never bulks up — the single most common reason a bed of winter pansies looks thin and sulky in February.

January to March, under cover with a little heat, gives summer-bedding pansies that flower from May. They are quicker and easier, but the season is shorter and they resent July heat.

Here is the honest part nobody prints on the packet: winter pansies do not really grow in winter. They flower in mild spells on growth they made in October and November. Everything about the autumn schedule exists to bank that growth before the days get short. If you are sowing in the last week of August, you are at the edge of the window — sow now, and keep the seedlings moving.

How to sow pansies from seed, step by step

1. Sow into modules, not a warm windowsill Fill a module tray with fine, moist seed compost and firm it lightly. Modules avoid the root disturbance that checks pansies badly — see our indoor seed starting guide for the basics.
2. Cover the seed properly Two seeds per cell, then a 3 mm layer of sieved compost or vermiculite. Pansy seed needs darkness — an uncovered sowing is the classic reason a packet "fails".
3. Keep it cool: 15–18 °C A shaded cold frame, a north-facing sill or the cool side of the greenhouse. Above 22 °C germination stalls; a heated propagator in August is actively counter-productive. Our guide to what seeds need to germinate explains why temperature ranges cut both ways.
4. Uncover as soon as they show Expect 10–20 days, and expect them to come up unevenly. Move seedlings into full light immediately or they stretch — the classic leggy seedling problem.
5. Pot on at three true leaves Into 9 cm pots, and keep them outside in a sheltered spot. Water from below in the morning; pansy seedlings are prone to damping off in still, damp air.
6. Plant out by early October 15–20 cm apart in free-draining soil or containers, in sun or light shade. Firm them in well and pinch off any early flower buds for the first fortnight so the plant builds roots first.

Growing on: the jobs that double your flowering season

Pansies are not hungry plants, but they are thirsty ones in containers, and they are ruthless about seed. The moment a pansy sets a seed pod, it starts winding down — which is why deadheading is the single highest-leverage thing you can do. Do not just pull the faded petals off: follow the stem down and remove the swelling green pod behind the flower. Ten minutes a week from October to May will genuinely double what the plant gives you.

Feed fortnightly with a high-potash liquid feed once flowering starts, and stop nitrogen-rich feeds altogether — soft, leafy growth is what rots in winter wet. Our guide to feeding and fertilising covers the ratios. In March, when overwintered plants look tired and stretched, shear the whole plant back by half and feed; they come back bushier within three weeks and flower until the summer bedding takes over.

Drainage decides who survives February. Pansies take −10 °C without complaint but will rot in a saturated pot, so use gritty compost and raise containers on feet — the same principle behind our raised bed guide. For pots and window boxes specifically, our container growing guide covers volume and watering.

Pansy or viola: which should you sow?

For edging, gaps in paving and winter window boxes, violas win outright. For a statement pot you will look at every day, sow pansies. Both are edible, incidentally, and turn up regularly in our edible flower collection — the petals are mild and the flowers crystallise beautifully.

Common pansy mistakes

• Sowing them warm — a propagator at 24 °C will give you almost nothing. Cool and shaded beats warm every time.
• Leaving the seed uncovered — pansies need darkness to germinate. Cover with 3 mm of compost or vermiculite.
• Planting out too late — after mid-October the plant has no time to bulk up, and you get a thin, flowerless winter.
• Deadheading the petals only — leave the seed pods on and the plant stops. Remove the pod, not just the faded flower.
• Feeding nitrogen in autumn — soft growth going into winter is growth you will lose. Switch to high-potash once buds form.
• Replanting pansies in the same soil year after year — pansy sickness, a soil-borne root rot, builds up. Rotate the position or change the compost; our plant disease guide has the wider picture.
• Expecting winter growth — they flower in mild spells on autumn growth. Plan the schedule around October, not January.

Frequently asked questions

When should I sow pansy seed for winter flowering?
Between late June and the end of August. Sow now, pot on in September, plant out by early October — that October deadline is what separates a good winter display from a disappointing one. Everything tagged for the season sits in our August and September sowing collections.

Why won't my pansy seed germinate?
Nine times in ten it is too warm, too light, or both. Pansies want 15–18 °C and total darkness, so cover the seed and move the tray somewhere cool and shaded. If you have ruled those out, check the seed itself with a simple germination test — pansy seed keeps well for two to three years in cool, dry storage.

Are pansies annuals, biennials or perennials?
Technically short-lived perennials, but they are grown as biennials or annuals because the second year is always weaker and leggier. Sow fresh every year; you will find them alongside the true biennials in our biennial flower collection.

Can pansies survive frost?
Easily — established plants take −10 °C and often keep a few flowers open. What kills them is waterlogging, not cold, so free-draining soil or gritty compost in a raised pot matters far more than fleece.

A tray of pansy seed sown this week is a doorstep full of colour when nothing else is doing anything at all — which is, in the end, the whole point of them. Browse the Viola wittrockiana range, the tougher Viola cornuta violas, or the wider annual and flower seed collections; pair them with something vertical from our climbing plants guide, dip into the rest of our growing guides, or check the overall sowing calendar. Sow cool, sow covered, plant out by October — the rest takes care of itself.