Spring Bulbs to Plant in September (UK Guide)

Plant your spring bulbs in September and you set up the whole of next spring in an afternoon. Daffodils, crocus, hyacinths and alliums all go in from this month, and the earlier you plant them the better they establish. The soil is still warm from summer, autumn rain does the watering for you, and the bulbs put down roots before the cold arrives.

This guide covers exactly which bulbs to plant in September, how deep and how far apart to set them, and how to plant them in borders, pots and lawns. It also explains the one important exception — tulips — and the handful of mistakes that catch people out. It sits alongside our wider guide to what to plant in September, which covers the vegetables, fruit and maintenance jobs for the month.

Why September is the month for spring bulbs

Spring-flowering bulbs need a long, cool establishment period before they flower. Plant them in early autumn and the roots grow steadily through September and October while the soil holds its summer warmth, typically 12-15 °C at planting depth. By the time hard frosts arrive, the bulb is anchored and ready to sit out winter.

The RHS advises planting most spring bulbs — daffodils, crocus and hyacinths — by the end of September, and daffodils ideally in early autumn. Leave it until the soil is cold and wet and the bulbs root more slowly, flower less reliably, and are more likely to rot. There is no advantage to waiting, so once the bulbs arrive, get them in.

The exception, covered in full below, is the tulip. Tulips are planted later, from November, to reduce the risk of a fungal disease called tulip fire.

The best spring bulbs to plant now

Daffodils (Narcissus)

Daffodils are the most forgiving spring bulb and the best starting point for beginners. Plant them as early as you can in autumn — September is ideal — in a sunny or lightly shaded spot in fertile, well-drained soil. They naturalise happily in grass and under deciduous trees, coming back and multiplying year after year.

For pots and the front of borders, the compact Narcissus ‘Tête-à-tête’ is one of the most reliable and widely sold choices in the UK, flowering early with several small yellow blooms per stem. For naturalising in grass, ‘February Gold’ is a tough, early dwarf daffodil that spreads well. Both are popular, reliable garden performers.

Crocus

Crocus give you the first real splash of colour in late winter, often pushing through in February. Species crocus such as Crocus tommasinianus ‘Ruby Giant’ are superb for naturalising in lawns and gravel, where they seed around gently over time. The larger Dutch hybrids (‘Flower Record’, ‘Jeanne d’Arc’) give bigger, showier goblets for borders and pots.

Plant species crocus 7-10 cm deep and the larger Dutch hybrids a little deeper, around 10-12 cm. They are cheap, plant in minutes, and bees emerging on mild late-winter days rely on their early pollen.

Hyacinths

Hyacinths are grown for their scent as much as their colour, so plant them where you will brush past them — beside a path, in a pot by the door, or in a window box. ‘Delft Blue’ and ‘City of Haarlem’ (soft yellow) are long-established, reliable varieties. Plant 10-12 cm deep. Always wear gloves when handling hyacinth bulbs, as the bulb sap can irritate skin.

Alliums

Ornamental alliums produce dramatic spherical flower heads on tall stems in late spring and early summer, bridging the gap between the spring bulbs and the summer borders. Allium ‘Purple Sensation’ is the classic deep-violet variety, while Allium hollandicum and the larger-headed Allium cristophii are also widely grown. Plant in early autumn in free-draining soil and full sun, in a spot sheltered from strong wind so the tall stems do not get blown over.

Others worth planting in September

• Muscari (grape hyacinth): Low, intense-blue spikes that naturalise readily. Excellent edging and good in pots. Plant 7-8 cm deep.
• Snowdrops (Galanthus): Best planted “in the green” (as growing plants in late winter) rather than as dry bulbs, but dry bulbs planted early in autumn and kept moist can still establish.
• Iris reticulata: Tiny, jewel-like dwarf irises for pots and the front of borders, flowering with the crocus. Plant 10 cm deep.

Planting depth and spacing (quick reference)

The single most common reason bulbs fail is planting them too shallow. As a rule of thumb, plant a bulb at two to three times its own height deep, and roughly two to three bulb-widths apart. Use the table below for the popular spring bulbs.

Bulb	Planting depth	Spacing	Best for
Daffodil (Narcissus)	3× bulb height (≈10-15 cm)	10-15 cm apart	Borders, grass, under trees
Crocus (species)	7-10 cm	5-8 cm apart	Lawns, gravel, pots
Crocus (Dutch hybrid)	10-12 cm	8-10 cm apart	Borders, pots
Hyacinth	10-12 cm	8-10 cm apart	Pots, window boxes, border fronts
Allium (large)	4× bulb diameter (≈15-20 cm)	20 cm apart	Borders
Muscari	7-8 cm	5 cm apart	Edging, pots

If you are ever unsure, deeper is safer than shallower. Bulbs set too near the surface are vulnerable to frost, drought and being turned up by squirrels.

How to plant bulbs in borders

Bulbs look most natural planted in generous, informal drifts rather than tidy rows. For the best effect, plant at least 10-15 bulbs of a single variety together.

1. Choose the spot: Most spring bulbs want sun or light shade and soil that drains freely. If your soil is heavy clay, add a handful of horticultural grit to each planting hole.
2. Dig to the right depth: Use a trowel or a bulb planter for individual holes, or lift a whole area of soil for a drift. Check the depth against the table above.
3. Set the bulb pointed end up: The pointed tip is the shoot; the flatter, often rooty base goes down. If you genuinely cannot tell, plant the bulb on its side — it will right itself.
4. Backfill and firm gently: Cover with soil, firm lightly to remove air pockets, and water in if the ground is dry.
5. Label or mark: Mark the area so you do not accidentally dig through the bulbs while they are dormant.

How to plant bulbs in pots and containers

Bulbs are made for containers. A single pot by the door delivers a hit of scent and colour exactly where you will see it, and you can grow several layers in one pot for a long, overlapping display. Containers are also the simplest way to start if you garden on a patio or balcony — our guide to the best containers and pots for beginners covers choosing the right size and material.

For pots, use a peat-free, multipurpose compost with some added grit for drainage; our guide to the best compost for container gardening explains the options. Make sure the container has drainage holes — waterlogged compost is the quickest way to rot bulbs over winter.

The “bulb lasagne” method. Plant bulbs in layers, largest and latest-flowering at the bottom, smallest and earliest at the top:

1. Add a layer of compost to a deep pot, then set the largest bulbs (daffodils, large alliums) near the base, around 15-20 cm down.
2. Cover with compost, then add a middle layer of hyacinths or Dutch crocus.
3. Cover again and finish with a top layer of the smallest bulbs (muscari, species crocus, Iris reticulata).
4. Top off with compost, water once, and stand the pot in a sheltered spot. The shoots thread past each other and flower in succession from late winter into spring.

Naturalising bulbs in grass

Daffodils and crocus are perfect for naturalising — planting in grass so they come back and spread each year for a meadow effect. The RHS recommends scattering bulbs by hand and planting them where they fall, which avoids a regimented look.

1. Throw a handful of bulbs gently across the area and plant each where it lands.
2. For daffodils, use a bulb planter to take out a plug of turf, drop the bulb in pointed end up, and replace the plug. For small crocus, lift a flap of turf with a spade, push the bulbs in, and fold the turf back.
3. The golden rule: do not mow the area until the bulb foliage has died down naturally, about six weeks after flowering. The leaves feed next year’s flowers, so cutting them early weakens the display.

What to wait on: tulips until November

Tulips are the one spring bulb you should not plant in September. Plant them too early, into warm autumn soil, and you increase the risk of tulip fire (Botrytis tulipae), a fungal disease that scorches leaves and flowers and can ruin a whole planting.

Wait until November, when soil temperatures have dropped below about 10 °C. Tulips cope perfectly well with late planting — even December is fine — so there is no rush. Store the dry bulbs somewhere cool and dry in the meantime, and plant them once the rest of the garden has been put to bed. If you want the detail on timing, our September planting guide and the October guide that follows it set the bulbs in their wider seasonal context.

Common mistakes to avoid

Planting too shallow

Why it happens: People underestimate how deep bulbs go. How to fix it: Use the depth table above and err on the deeper side — most spring bulbs want two to three times their height of soil over the top.

Planting tulips with everything else in September

Why it happens: It feels efficient to do all the bulbs at once. How to fix it: Keep tulips aside and plant them in November to dodge tulip fire.

Letting bulbs sit in waterlogged soil

Why it happens: Heavy clay or pots without drainage holes hold water. How to fix it: Add grit to planting holes and compost, and only ever use containers with drainage.

Cutting the leaves down too soon

Why it happens: The dying foliage looks untidy. How to fix it: Leave it for at least six weeks after flowering so the bulb can build up reserves for next year.

Where to buy spring bulbs in the UK

Buy bulbs as soon as they appear in late summer, while the choice is widest and the bulbs are freshest. For our pick of the best varieties to buy and where to find the best value, see the buyer’s guide to spring-flowering bulbs. Look for firm, plump bulbs with no soft patches, mould or signs of sprouting. Bigger bulbs of a given variety generally give bigger, more reliable flowers.

Specialist mail-order suppliers such as Suttons, Thompson & Morgan and You Garden carry the widest range of varieties and despatch at the right planting time, while Crocus stocks bulbs alongside the peat-free compost and bulb planters you will need. For a few packets to get started, the bulb stands in garden centres, B&Q and supermarkets in September are perfectly good — just buy early before they dry out on the shelf. A simple long-handled bulb planter makes light work of naturalising in grass and is worth having if you are planting more than a handful.

Frequently Asked Questions

When is it too late to plant spring bulbs?

Daffodils, crocus and hyacinths are best in by the end of September, but you can keep planting into October and even November if you run late — they will simply flower a little later or less strongly. Tulips are the exception and are deliberately planted from November. As long as the ground is not frozen or waterlogged, get bulbs in rather than storing them.

How deep should I plant daffodil bulbs?

Plant daffodils at about three times the height of the bulb, which usually works out at 10-15 cm deep. In light, sandy soil go towards the deeper end; in heavy clay, slightly shallower with grit underneath for drainage. Too shallow is the main reason daffodils come up “blind” with leaves but no flowers.

Can I plant bulbs in pots in September?

Yes — September is ideal for planting bulbs in pots. Use a peat-free multipurpose compost with added grit, make sure the pot has drainage holes, and try the “bulb lasagne” method of layering different bulbs for a long display. Stand the pots in a sheltered spot and water sparingly over winter.

Why can’t I plant tulips in September?

Planting tulips in warm September soil increases the risk of tulip fire, a fungal disease that thrives in warmth. Waiting until November, when the soil has cooled below about 10 °C, greatly reduces that risk. Tulips tolerate late planting, so there is no benefit to planting them early.

Do I need to feed spring bulbs?

Bulbs contain most of the food they need to flower the first spring, so feeding at planting is optional. To build up strong flowering for following years, apply a balanced or high-potassium feed as the leaves appear in spring and let the foliage die back naturally. Bulbs naturalised in grass rarely need feeding at all.

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