Planting Spring Bulbs for a Colourful Display

Plan in Autumn, Reap in Spring

The most dependable piece of theatre in any garden is performed quietly in October, then forgotten until the bleakest weeks of the year. Spring bulbs need a long, cold spell underground to break their dormancy and trigger root growth, which is why the planting window in Britain runs from mid-September through to early December. Miss it and you will spend March eyeing a bare border and wondering where it all went wrong.

Timing within that window matters more than most people realise. Daffodils and snowdrops are happiest in the ground by early October, giving them time to root before the soil turns cold and heavy. Tulips are the contrarians of the bulb world: plant them in November, when the soil has cooled, and they will settle in without risk of rotting. Planted too early in a mild, wet autumn, they sulk, split or simply vanish.

Choosing Bulbs Worth the Space

Buy the biggest, firmest bulbs you can reasonably afford, and buy them from a supplier who sells by size rather than by weight. A tulip bulb of 11/12cm circumference will give you a taller, sturdier flower than a cheap 9cm bulb, and the difference in cost is a few pence each. Reject anything soft, mouldy, or light as a feather — that is a bulb that has already given up.

For a display that starts in late winter and runs into early summer, work with this sequence:

• Snowdrops (Galanthus) — the first real event of the year, often flowering in January. Best bought and planted "in the green" in spring, but dry bulbs planted in autumn will establish well enough in a moisture-retentive spot under deciduous shrubs.
• Crocus — corms rather than bulbs, and worth planting in generous drifts through lawn or gravel. They open in sun and close in rain, which makes them a small barometer as much as a flower.
• Daffodils (Narcissus) — the reliable backbone. Smaller varieties such as 'Tête-à-Tête' suit pots and window boxes; taller trumpet types naturalise beautifully in rough grass.
• Tulips — the colour crescendo of April and May. Choose Darwin hybrids for permanence and strong stems, or species tulips for something subtler and more perennial in gravel.
• Alliums — planted a little later and flowering in late May and June, their spheres of purple hover above fading foliage and bridge the gap into summer.

How to Plant Them Properly

The old rule holds good: plant at roughly three times the bulb's own height. Depth is not a suggestion — shallow planting leads to floppy stems, frost damage, and bulbs that work their way to the surface.

• Daffodils: 15cm deep, 10–15cm apart, in clumps of at least ten for impact.
• Tulips: 15–20cm deep, 10cm apart, in groups of odd numbers.
• Crocus: 7–8cm deep, planted close together in drifts of twenty or more.
• Snowdrops: 8–10cm deep, in small clusters that can be lifted and divided later.

Prepare the ground by forking it over and working in a handful of grit or well-rotted compost per planting hole. Drainage is everything: bulbs sitting in waterlogged clay will rot long before spring. A bulb planter makes quick work of a lawn, and a sprinkling of grit in the hole deters mice and squirrels, who find tulip bulbs a particular delicacy. Water the area in gently afterwards, then largely leave it alone.

Designing for a Sequence of Colour

The secret to a display that lasts months rather than a fortnight is overlap. Plant so that one group fades as the next arrives: snowdrops and winter aconites in January, crocus and hellebores in February, daffodils through March, tulips in April and May, alliums to follow. Where a border is thin in summer, you can underplant later-flowering perennials without any real conflict, since bulbs are done and dormant by the time those plants need their space.

Resist the temptation to dot single bulbs about the place. Nothing looks meaner than one lonely daffodil. Plant in clumps, drifts and ribbons, repeating the same variety at intervals so the eye is drawn along the border rather than stopping at one spot. If you have a lawn, naturalised daffodils and crocus will look far better scattered informally than arranged in rows.

Pots, Containers and the Small Garden

Containers give you control over drainage, which makes them ideal for tulips, and they let you lift the whole display to eye level on a doorstep or terrace. Use a loam-based compost rather than a light multi-purpose mix, add grit to the base, and raise pots onto feet so water can escape freely through the winter.

You can also layer bulbs in a single pot for a longer show. Put daffodils deepest, cover with compost, then add a layer of tulips, and top with crocus or iris near the surface. All three will emerge in their own time from the same pot, giving you two months of interest from one planting.

Spring Care and Next Year's Display

Deadhead daffodils and tulips once the flowers fade, nipping off the seed head but leaving the stem and leaves intact. Those leaves are the bulb's solar panel, and they need around six weeks of sunlight after flowering to build up reserves for the following year. Never tie them in knots or cut them back early, however untidy they look.

A liquid tomato feed every fortnight while the foliage is still green will pay dividends, particularly for bulbs in pots. Snowdrops and daffodils can be left undisturbed for years, dividing clumps only when flowering thins. Tulips are less obliging; in heavy soil, many gardeners treat them as annuals and plant fresh each autumn, which is no great hardship given how spectacular they are. Do that, and the performance will repeat itself every year, arriving just when you need it most.