How to Plant Spring Bulbs: Depth Chart, Spacing Rules and Why Planting in Drifts Beats Rows
Plant in autumn, reap the rewards in spring. This complete guide to planting spring bulbs covers timing, depth, spacing, the best varieties for UK gardens, and how to layer bulbs for a succession of colour.
Few gardening experiences match the reward of spring bulbs. You bury an apparently dead, papery lump in cold autumn soil, forget about it through the grey months of winter, and then — sometime between February and May — it delivers exactly what you planted: a precisely timed flush of colour, fragrance, and form. Spring bulbs are the closest thing to guaranteed success in gardening, provided you plant them at the right time, in the right place, and at the right depth.
This guide covers everything you need to know: which bulbs to choose, when and how deep to plant them, the best locations for different effects, and the techniques that will give you the most dramatic spring display possible.
When to Plant Spring Bulbs
The general rule for spring bulbs is simple: plant in autumn, from September through November. But the precise timing varies by bulb type, and getting it right makes a noticeable difference.
September: Start with alliums and crocuses. Alliums benefit from the longest possible establishment period, and species crocuses planted in September begin developing root systems that will carry them through decades of naturalising in grass. Daffodil bulbs can also go in from mid-September.
Seasonal Garden Calendar
Know exactly what to plant, prune and sow — every month of the year.
October: The prime month for most spring bulbs. Daffodils, hyacinths, snowdrops, grape hyacinths (muscari), snakeshead fritillaries, and chionodoxa all go in during October. The soil is still warm enough for vigorous root development, and there’s typically enough moisture to get plants off to a good start without supplemental watering.
October–November: Tulips are best planted later than most spring bulbs. Cooler soil temperatures — ideally below 10°C — reduce the risk of tulip fire disease (Botrytis tulipae), which thrives in warmer conditions. Many experienced gardeners specifically wait until November to plant tulips and notice a significant reduction in disease problems compared to earlier autumn planting.
November: The window for all spring bulbs remains open through November. Even late plantings will produce a reasonable display, though bulbs planted in November may flower slightly later than those planted in September–October. Tulips planted in late November often perform better than those planted in October.
For more on this, see spring bulbs order.
Best Spring Bulbs for UK Gardens
Tulips (Tulipa)
Tulips are the queen of the spring garden — no other bulb offers the same range of colour, form, and scale. They range from the stately Darwin Hybrids with their dinner-plate blooms on 60cm stems, to delicate species tulips like T. sylvestris that naturalise in grass, to the extraordinary fringed and parrot types that look almost artificial.
Key groups: Single Early (March–April, compact, good in pots), Darwin Hybrid (April, large flowers, long stems, excellent for cutting), Triumph (mid-April, robust, wide colour range), Parrot (late April–May, fringed and ruffled, exotic), Viridiflora (late April–May, green markings, long-lasting), and Single Late (May, tall and elegant).
Tulips pair beautifully with forget-me-nots — a classic English garden combination. The soft blue of forget-me-nots (Myosotis) perfectly complements tulips in any colour, and the forget-me-nots fill the gaps between tulip stems at ground level, creating a layered effect that’s far more attractive than tulips alone. Plant the forget-me-nots as plugs or seedlings in autumn alongside your tulip bulbs.
Daffodils (Narcissus)
Daffodils are the most forgiving of all spring bulbs — reliably hardy, largely untroubled by pests, and happy to naturalise and multiply over many years. They range from the classic large-cupped yellow trumpets to miniatures like ‘Tête-à-Tête’, pure white poeticus types, and the sweet-scented jonquil hybrids.
For a long season, plant a mix: Narcissus ‘February Gold’ for February colour, standard large-cupped varieties through March–April, and the late-flowering N. poeticus ‘Actaea’ for May. Daffodils are ideal for naturalising in rough grass or under deciduous trees — they’ll build into increasingly large clumps over the years. After flowering, leave the foliage to die back naturally for at least six weeks before cutting — this is critical for bulb replenishment.
Alliums
Ornamental alliums are the backbone of late-spring and early-summer planting schemes, producing globe-like flowers on tall, upright stems in May–June when many spring bulbs have finished. Allium ‘Purple Sensation’ produces deep violet spheres on 80cm stems; ‘Gladiator’ is slightly larger; ‘Globemaster’ and ‘Ambassador’ produce enormous heads up to 20–25cm across on 120cm stems. ‘Mount Everest’ and ‘White Giant’ offer creamy white alternatives.
Related: what to plant in spring.
Alliums are exceptional in naturalistic borders because the seed heads persist for months after flowering, providing structural interest through summer. They work particularly well as a bridge plant, filling the gap between late tulips and early summer perennials.
Crocuses
Crocuses are the first bulbs to flower — from late January in mild years, and reliably through February–March. They’re most effective planted in large numbers: a hundred crocuses planted in a lawn looks spectacular; twenty dotted around a border barely registers. Species types like Crocus tommasinianus (pale purple-lilac, very early) and C. chrysanthus cultivars naturalise freely and multiply into large colonies.
For lawn naturalising, use an auger bit on a drill to speed up hole-making, or use a dedicated bulb planter. Scatter bulbs first to achieve a natural distribution, then plant each one where it falls. The effect in year one is good; in year five it is extraordinary.
Hyacinths
Hyacinths are grown primarily for their extraordinary fragrance — a single pot near a window or doorway in March will scent a whole room. They’re at their best in the first year after planting, producing dense, impressive flower spikes. In subsequent years the spikes become thinner, which is why many gardeners treat them as annuals. Available in purple, blue, pink, white, yellow, and apricot.
For indoor use, ‘prepared’ hyacinth bulbs that have been artificially chilled are available from September and can be planted for Christmas flowering. Use specialist bulb bowls with bulb fibre (not soil) and keep in a cool dark spot for 8–10 weeks before bringing into warmth.
Snowdrops (Galanthus)
Snowdrops flower from January–February and are among the most beloved of all British garden plants. While specialist ‘galanthophiles’ pay extraordinary prices for choice cultivars, standard Galanthus nivalis grown in drifts under deciduous trees is one of the most affecting sights in early spring. Dry snowdrop bulbs planted in autumn establish more slowly than ‘in-the-green’ plants but do work given time.
See also our guide to what to plant in autumn.
How to Plant Spring Bulbs: Depth, Spacing, and Technique
The Depth Rule
The general rule for bulb planting depth is to plant at a depth of three times the bulb’s height. So a tulip bulb 5cm tall goes in at 15cm deep; a crocus corm 2cm tall goes in at 6cm. This applies to the base of the bulb — measure the depth of the hole from the bottom of the hole to soil level, not to the tip of the bulb.
Deeper planting in light, free-draining soils and slightly shallower planting in heavy clay is acceptable. Deeper planting on well-drained soils tends to produce more reliable perennial performance as the bulbs are less subject to temperature fluctuations.
Pointy End Up
Always plant bulbs with the pointed growing tip facing upwards and the flat, root-plate side facing down. Most bulbs make this obvious — tulips and daffodils have a clearly defined point. Corms (crocuses, gladioli) have a slightly concave flat base and a dome-shaped top. If you genuinely can’t tell which end is up, plant sideways at the correct depth — the shoot will find its way up.
Spacing
For a bold, naturalistic look, plant at the minimum spacing recommended — or even slightly closer. A tulip bulb planted 10cm from its neighbour produces a more dramatic display than the same bulb planted 20cm away. The RHS recommendation for most bulbs is spacing at 2–3 times the bulb’s width, but for deliberate impact, closer spacing is better. For naturalising in grass, scatter and plant at random rather than in rows.
Where to Plant Spring Bulbs
Borders and Beds
Borders are the most versatile location for spring bulbs. Plant bulbs between and around established perennials, where the bulbs’ dying foliage will be hidden by the emerging perennial growth. Hostas are the classic companion for spring bulbs — their large, slow-emerging leaves perfectly cover the unsightly dying foliage of tulips and daffodils from May onwards. The hosta fills exactly the space left by bulb foliage as it dies back, making them a near-perfect pairing.
Peonies (see our peony care guide) work similarly — their emerging bronze-red spring shoots coincide with late-season tulips beautifully, and their dense summer foliage hides any remaining bulb leaves. Plant tulip bulbs around the drip line of established peonies, not directly beneath them.
Containers
Container planting offers complete control over soil, drainage, and presentation. For pots, use multipurpose compost mixed with at least 25% grit or perlite for drainage — tulips in poorly-drained containers are significantly more prone to basal rot. Plant bulbs much closer together than in the ground: in a 30cm pot, 7–9 tulips packed tightly will produce a spectacular display.
Containers also allow you to grow tulips and remove the pots after flowering, which some gardeners prefer — the pot can be moved to an out-of-the-way spot while the foliage dies back, then stored until autumn without disrupting the border.
Naturalising in Grass
Naturalised bulbs in grass — daffodils under apple trees, crocuses in a lawn, snakeshead fritillaries in a damp meadow — are one of the most beautiful sights in the spring garden. The key to success is restraint: restrict mowing until the bulb foliage has died back completely (at least 6 weeks after flowering), accept that a section of lawn will look untidy from May to June, and plant in genuinely large numbers.
Species that naturalise best in UK conditions: Narcissus pseudonarcissus (wild daffodil), Crocus tommasinianus, Crocus vernus, Galanthus nivalis, Fritillaria meleagris (snakeshead fritillary, best in moist grass), and small species tulips like T. sprengeri.
Soil Preparation and Drainage
Most spring bulbs share one critical requirement: they will not tolerate waterlogged soil. Tulips are particularly sensitive — a tulip bulb sitting in cold, wet soil through winter will rot. Before planting, improve drainage if necessary by working sharp grit into heavy clay soils, raising beds, or planting on a slight slope.
Related: spring planting guide: when plant.
In well-drained soils, minimal preparation is needed beyond weeding and loosening compaction. Avoid adding fresh manure to bulb planting areas — it can encourage basal rot. Well-rotted compost worked in at planting depth is beneficial; fresh organic matter is not.
Container soils should be replaced annually for tulips — don’t reuse potting compost from the previous year, as disease can carry over.
Layering Bulbs for Succession Planting (Lasagne Planting)
One of the most effective container planting techniques is ‘lasagne planting’ — layering different bulb types at different depths in the same container to create a succession of flowers from February through May.
The method is simple: in a large container, work from the deepest to the shallowest layer:
- Bottom layer (15–20cm): Tulips — these need the most depth and flower latest
- Middle layer (10–12cm): Daffodils or hyacinths
- Top layer (5–8cm): Crocuses, grape hyacinths (muscari), or snowdrops
Fill compost between each layer, ensuring bulbs don’t touch each other. The result is a container that flowers from February (crocuses and snowdrops) through April (daffodils, hyacinths) to May (tulips) — three months of colour from a single pot. Use a pot at least 40cm deep for this technique to work properly.
After Flowering: Leave Foliage to Die Back
The golden rule after spring bulb flowering: never cut the foliage until it has completely died back naturally, which takes a minimum of 6 weeks after the last flower. The leaves are the factory that produces the energy the bulb stores for next year’s flowering. Cut them prematurely and you’ll have weak, poorly-flowering bulbs the following spring.
For more on this, see spring pruning guide: which plants.
The same applies to daffodils in grass — don’t mow until the leaves have gone yellow and limp. The period of untidy dying foliage is the price of bulbs; experienced gardeners plan their planting to hide it with emerging perennial growth.
After the foliage has completely died back in June–July, you can lift tulip bulbs, dry them in a warm, ventilated spot for a week, then store them in paper bags in a cool, dry place until autumn replanting. Daffodils, alliums, and crocuses can simply be left in the ground to naturalise.
Common Mistakes
- Planting too shallow: The single most common cause of poor bulb performance. A tulip bulb planted at 8cm instead of 15cm will produce smaller, weaker flowers and may not survive the winter in poorly-drained soil.
- Planting in waterlogged soil: Bulbs rot quickly in wet conditions. Improve drainage before planting or choose a different location.
- Planting too late (or not at all): Bulbs left in a bag or shed through October and November will deteriorate. A November planting is always better than none.
- Cutting foliage too early: Tying daffodil leaves in knots, plaiting them, or cutting them before 6 weeks have passed will produce weaker bulbs the following year.
- Planting in too-small groups: Three tulips in a border are nearly invisible. Thirty tulips are spectacular. Always plant in groups of minimum 10–15.
- Planting tulips in the same spot repeatedly: Tulip fire disease can build up in soil where tulips are grown year after year. Move tulips to a different spot each year, or grow them in containers with fresh compost.
Frequently Asked Questions
Can I plant bulbs in spring instead of autumn?
Spring-flowering bulbs — tulips, daffodils, alliums, crocuses, hyacinths — require a cold period (vernalisation) to flower properly, and this must happen in the ground over winter. You cannot replicate this by planting in spring. The only way to have spring-flowering bulbs in spring is to plant them the preceding autumn. Summer-flowering bulbs like dahlias, gladioli, and lilies are a different category and are planted in spring.
How deep should I plant tulip bulbs?
The RHS recommends planting tulip bulbs at a depth of three times their height — typically 15–20cm for standard-size tulips. Deep planting in free-draining soil helps with perennial performance and reduces disease risk. In containers, plant at 12–15cm in a gritty compost mix.
Will squirrels eat my bulbs?
Squirrels and mice are particularly attracted to tulip and crocus bulbs, and will dig them up within days of planting. Daffodils, alliums, and snakeshead fritillaries are toxic and left alone. To protect vulnerable bulbs: cover the planting area with wire mesh or chicken wire immediately after planting (remove in spring before growth starts), plant late in the season when squirrel activity is lower, or interplant with daffodils as a deterrent.
Why are my tulips not coming back after the first year?
Most tulips are not reliably perennial in UK conditions. Species tulips and some Darwin Hybrids will return, but the majority of modern tulip cultivars produce their best display in the first year and decline thereafter. Lifting and storing bulbs each summer, replanting in fresh compost each autumn, and choosing ‘perennialising’ varieties (such as ‘Queen of the Night’, ‘Negrita’, and most Darwin Hybrids) all improve longevity.
When do spring bulbs flower?
Flowering times vary by species and variety. As a rough guide: snowdrops (January–February), crocuses (February–March), early daffodils (February–March), hyacinths (March–April), main daffodils (March–April), tulips (April–May, depending on type), and alliums (May–June). By choosing a range of types across these flowering periods, you can have continuous colour from January through June from autumn-planted bulbs alone.
Sources
- Royal Horticultural Society. Bulbs: Planting. RHS. www.rhs.org.uk/plants/bulbs/planting
- Royal Horticultural Society. Tulip fire. RHS. www.rhs.org.uk/disease/tulip-fire
