Preparing Your Garden for Spring Bulbs

Why Autumn Is the Secret to a Spring Show

There is something quietly thrilling about the first crocus pushing through a cold February lawn, or a line of daffodils nodding along a fence in March. That colour never happens by chance. It is decided in the autumn, on a damp Saturday in October when the rest of the garden is winding down and a cup of tea feels far more appealing than a trowel. Spring bulbs need a long, cold spell in the ground to trigger the biochemical process that makes them flower, so the earlier you prepare, the better your display will be. September through November is the sweet spot for most of the UK, with tulips best left until late October or November to reduce the risk of disease.

The good news is that bulbs are among the most forgiving things you can plant. Give them decent soil, the right depth and a little protection from hungry wildlife, and they will reward you year after year.

Clear Weeds and Open Up the Ground

Before you think about bulbs, deal with what is already there. Weeds compete for water and nutrients, and a dense mat of creeping buttercup or ground elder will smother emerging shoots in spring. Start by cutting back any spent summer bedding, then fork over the area to a spade's depth, removing roots as you go. Perennial weeds such as bindweed or couch grass need every fragment lifted out, so take your time and work methodically.

• Dig out deep-rooted weeds rather than hoeing them, which only chops them up.
• Remove stones, old roots and any bits of broken pot or plastic.
• Leave the soil to settle for a week or so before planting if you can.
• Mark the edge of your bulb patch with canes or a shallow trench so you don't forget where it is.

If you are planting into a lawn with crocuses, mow the grass short first and scarify lightly. Crocuses naturalise beautifully in turf, but they need light and air to do it.

Improve the Soil Before You Plant

Bulbs hate sitting in cold, soggy ground. They rot quickly in waterlogged clay, and they sulk in thin, dusty soil. The fix is the same in both cases: organic matter. Fork in two or three buckets of well-rotted garden compost or leaf mould per square metre, along with a handful of blood, fish and bone or a dedicated bulb fertiliser. This opens up heavy clay and helps light soils hold moisture.

If your soil is genuinely heavy, add a layer of horticultural grit at the base of each planting hole. A raised bed or a large container is a sensible alternative for anyone gardening on thick clay. Aim for a soil pH that is roughly neutral; most bulbs cope with slightly acid or slightly alkaline conditions, but nothing extreme.

Choosing Your Bulbs: Daffodils, Tulips and Crocuses

Buy bulbs from a reputable supplier and choose firm, plump specimens with no soft patches or mould. Smaller, cheaper bulbs usually mean smaller flowers.

• Daffodils are the easiest and most reliable. They naturalise readily, returning year after year, and are ignored by most pests. Plant them where they can be left undisturbed.
• Tulips offer the widest range of colour and form, from simple cups to fringed and parrot varieties. Many are best treated as annuals in the UK, lifted and replaced each year, though species tulips are far more persistent.
• Crocuses are small but mighty, flowering from late February. Plant them in drifts through grass, at the front of a border or in shallow pots near the back door.

Mix in a few alliums, snowdrops or grape hyacinths if you want the display to run from February right through to May.

Getting the Planting Depth Right

The general rule is simple: plant a bulb at roughly three times its own height. In practice, that means daffodils at 10–15cm deep, tulips at 15–20cm deep and crocuses at 7–8cm. Space daffodils about 10–15cm apart, tulips 10cm apart and crocuses 5–8cm apart. Always set them with the pointed tip upwards and the flat, rooty base down. If you cannot tell which way is up, plant them on their side; they will sort themselves out.

A bulb planter makes light work of it, or you can lift a whole spadeful of soil, tuck the bulbs in and replace the turf on top. Water them in well after planting and label the area so you don't accidentally dig it over in winter.

Containers, Protection and Looking After Them

Pots are perfect for tulips and crocuses, especially if you want colour on a patio. Use a loam-based compost, add grit for drainage and make sure there are plenty of holes in the base. Layering works beautifully in a deep pot: tulips at the bottom, daffodils in the middle and crocuses near the surface, giving you weeks of successive flowers.

Squirrels and mice are the main threat, particularly to tulips. Plant deeper than usual, lay a piece of chicken wire just below the surface, or mulch with sharp grit. Once shoots appear, watch for slugs on young growth. After flowering, deadhead but leave the foliage for at least six weeks so the bulb can store energy for next year. Feed with a high-potash fertiliser as the leaves yellow, then let them die back naturally. Do that, and next spring your garden will pay you back handsomely.