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When should you plant spring bulbs? A simple autumn timeline
Seasonal Gardening
When should you plant spring bulbs? A simple autumn timeline
Not all spring bulbs should be planted at the same time. Daffodils, crocus and hyacinths are normally planted earlier in autumn. October is the main planting month for many spring bulbs. Tulips are best left until November.
The simple autumn timeline
Spring colour starts in autumn. It feels unfair, but gardening has always had a flair for admin.
Late September: start with daffodils, crocus and hyacinths
Late September is a good time to begin with the bulbs that benefit from getting settled early. Start with daffodils, crocus, hyacinths, and some smaller early spring bulbs, depending on variety.
Daffodils are the classic early autumn choice. They are useful in borders, pots and grass, provided the position suits them. They generally prefer well-drained soil and will grow in sun or light shade.
Crocus are good for early colour in pots, borders, grass or under deciduous trees. Deciduous trees lose their leaves in winter, so bulbs planted underneath often get useful light in early spring before the canopy fills again.
Hyacinths are worth planting where you will notice their scent: near doors, paths, patios or spring containers. Fragrance is wasted if only the bins get to enjoy it.
October: the main spring bulb month
October is the month to get most of your spring bulb planting done. The soil is usually still workable, there is time for roots to establish, and you are not yet gardening with frozen fingers and a strong sense of personal betrayal.
Use October for daffodils if you have not planted them yet, crocus, hyacinths, muscari, Iris reticulata, spring pots and containers, and filling gaps in borders.
Before you plant, check the space rather than just checking the packet. Consider whether it is sunny or shaded, whether the soil drains well, if the spot is sheltered or windy, where you will see the flowers, and whether you are planting in the ground, a lawn or a pot.
For Dublin gardens, drainage is especially important. Our winters can be mild and wet, and many bulbs dislike sitting in cold, soggy soil or compost.
If you are planting in pots, make sure they have drainage holes. A pot without drainage is not really a planter. It is a decorative swamp with ambitions.
November: plant tulips
Tulips are the main exception to the “get them planted early” rule.
They are usually best planted in November. Waiting until later helps avoid giving tulips a long spell in mild, wet autumn soil, which can encourage disease problems such as tulip fire.
Late planting is not a magic shield. Gardening rarely offers magic shields, and slugs would only chew through them anyway. But for tulips, November is the sensible target.
Tulips are excellent for strong colour in pots and borders. They work well where you want a more deliberate, designed spring display. Just remember that many tulips are best treated as a display for the coming spring rather than a guaranteed long-term planting. Some return well, some do not, and variety and growing conditions make a difference.
What about alliums?
Alliums are also autumn-planted bulbs, and many are planted around October or November, depending on the variety.
They usually flower later than daffodils, crocus and tulips, so they are useful for carrying interest into late spring and early summer. Taller alliums can add height and structure through borders, while smaller types suit more compact spaces.
Check the expected height before planting. Some alliums are neat. Others have clearly misunderstood the word “subtle”.
How deep should you plant spring bulbs?
A useful rule is to plant most bulbs at about two to three times their own depth. So, if a bulb is roughly 5 cm tall, plant it about 10–15 cm deep. Always check the packet too, because exact depth and spacing can vary by bulb type and variety.
Plant the pointed end upwards where it is obvious. If it is not obvious, do your best. Most bulbs are more determined than they look.
Plant in groups for a better display
Bulbs usually look better planted in groups than dotted around one by one.
For borders, plant in small clusters or repeated groups. For pots, plant enough bulbs to give a generous display while still following spacing guidance. For a more natural look in grass, plant in loose drifts rather than straight lines.
One daffodil here and another three metres away can look less like a planting scheme and more like a clerical error.
Where spring bulbs work well
- Pots and containers Good for patios, doorways, balconies and small gardens. Drainage matters, especially through winter.
- Borders Useful for adding spring colour before many perennials and shrubs get going. Plant in groups for better impact.
- Lawns or grass Daffodils and some crocus can work well naturalised in grass. Choose suitable types and remember you will need to let the leaves die back naturally before mowing.
- Under deciduous trees and shrubs Early bulbs can use the spring light before the leaves return overhead. Avoid very dry, congested soil where bulbs may struggle.
Common bulb-planting mistakes
- Planting tulips too early Hold tulips until November. They do not need to go in at the same time as daffodils.
- Leaving every bulb until December Daffodils, crocus and hyacinths are better planted earlier. December is not the plan; it is the rescue mission.
- Planting into wet, compacted soil Bulbs need drainage. If the ground is heavy and wet, improve the planting area or use suitable containers.
- Using pots with no drainage Bulbs in wet winter compost may rot. Choose pots with drainage holes and avoid letting containers sit in water.
- Cutting leaves off too soon after flowering After flowering, bulb leaves need time to feed the bulb for the following year. Let foliage yellow and die back naturally before removing it.
- Assuming every bulb suits every space A sunny raised bed, a shaded front garden and a windy balcony are three different jobs. Light, drainage, exposure and space all matter.
What if you forgot until December?
If you find forgotten bulbs in December, check them first.
If they are still firm, healthy and not mouldy, it is usually better to plant them than keep storing them. The results may be mixed, especially for bulbs that prefer earlier planting, but they have a better chance in the ground than in a bag at the back of the shed.
Soft, rotten or badly mouldy bulbs should not be planted.
Autumn bulb planting timeline summary
- Late September Daffodils, crocus, hyacinths
- October Most spring bulbs, pots and border planting
- November Tulips, and many alliums depending on variety
- December Firm, healthy leftover bulbs if conditions allow, but expect mixed results
Planning for spring colour
Spring colour starts with a little autumn planning. Not glamorous, perhaps, but very satisfying when March arrives and your past self has done something useful for once.
