There are few gardening jobs that repay you as generously as planting bulbs in autumn. While the soil is still warm and the air turns crisp, a few hours of work can turn a bare border or pot into a tapestry of spring colour. The secret is not complicated: choose a well-drained spot, set each bulb at the right depth, and water them in. Do that, and you will be rewarded with daffodils, tulips, crocuses and alliums that return year after year.

Why autumn planting works so well

Bulbs are little storehouses of energy. In autumn, they are dormant but ready to root. The soil is still warm enough to encourage root growth before winter, yet cool enough to stop top growth. This gives them a head start. Plant too late, and they may not have time to anchor themselves. Plant too early, and they can be damaged by warm, wet weather or pests. In most of the UK, October and November are ideal for spring-flowering bulbs, though you can plant as late as December if the ground is not frozen. Snowdrops and crocuses are best planted in early autumn, while tulips can wait until November to reduce the risk of disease.

Choose a well-drained spot

Most bulbs hate sitting in soggy soil. If water lingers around the base, the bulb will rot. Before you dig, check that your chosen spot drains freely. On heavy clay, improve the soil by digging in plenty of well-rotted organic matter and a handful of horticultural grit. If your garden is very wet, plant in raised beds or containers instead. A sunny position is ideal for most spring bulbs, but many will also cope with light shade, especially if the shade comes from deciduous trees that are bare in spring. Wood anemones, snowdrops and cyclamen actually prefer a little shade.

Prepare the ground by removing weeds and stones. You do not need to dig deeply, but loosening the top 20–30 cm (8–12 inches) helps roots travel. If you are planting in containers, use a peat-free multipurpose compost mixed with grit for drainage. Make sure the pot has drainage holes.

Getting the depth and spacing right

The golden rule is to plant bulbs at two to three times their own height. A 5 cm crocus corm goes about 7–8 cm deep; a large daffodil bulb goes 10–15 cm deep; a tulip goes 15–20 cm deep. If you are unsure, err on the side of deeper rather than shallower. Deep planting helps bulbs anchor, protects them from frost, and discourages squirrels from digging them up.

Spacing matters too. As a general guide, set bulbs about two to three times their width apart. For a natural look, scatter them gently and plant where they land, rather than lining them up in rows. Here are some typical spacings:

• Snowdrops: 5–7 cm deep, 5 cm apart
• Crocuses: 7–8 cm deep, 7–8 cm apart
• Daffodils: 10–15 cm deep, 10–15 cm apart
• Tulips: 15–20 cm deep, 10–15 cm apart
• Alliums: 10–15 cm deep, 15–20 cm apart
• Hyacinths: 10–15 cm deep, 10 cm apart

For containers, you can plant in layers – a technique sometimes called lasagne planting. Put larger bulbs such as tulips at the bottom, cover with compost, then add smaller bulbs like crocuses near the top. This gives you a succession of flowers from one pot.

How to plant: step by step

Use a bulb planter or a trowel to make a hole at the correct depth. Place the bulb with the pointed end up – though most bulbs will right themselves if they are confused. If you cannot tell which way is up, plant it on its side; it will still grow. Backfill with soil or compost and firm gently. Do not press too hard, as you can damage the bulb.

If you are planting a large area, you can dig a trench instead. Fork the base to loosen it, add a layer of grit if drainage is poor, then place bulbs and cover. A dusting of bonemeal or a balanced bulb fertiliser at planting time can help, but it is not essential if your soil is already fertile. Never add fresh manure directly into the planting hole, as it can burn the bulbs.

Watering and aftercare

After planting, water well. This settles the soil around the bulbs and removes air pockets. In a normal UK autumn, you may not need to water again until spring, but if the weather is dry for several weeks, give them a drink. Containers dry out faster, so check them regularly and water when the top few centimetres are dry.

A mulch of compost or bark chips will suppress weeds and help retain moisture. It also hides the bare soil while you wait. If squirrels or mice are a problem, lay a sheet of chicken wire over the planting area and peg it down. Remove it when shoots appear. In containers, you can place a layer of grit on the surface to deter digging.

Designing for a longer spring display

Spring colour does not have to be a two-week wonder. Mix early, mid and late varieties to stretch the season from February to May. Start with snowdrops and winter aconites, follow with crocuses and early daffodils, then tulips and alliums. Plant in generous drifts for impact, and repeat the same colours in different parts of the garden to tie the scheme together.

Remember that spring bulbs need their leaves to die back naturally after flowering. The foliage feeds the bulb for next year. Do not cut it off, tie it in knots, or hide it with vigorous annuals. Instead, plant them among perennials that will grow up later and mask the fading leaves. Patience in autumn is the key to a spring garden that lifts the heart.