In the garden, bulbs and tubers are often mentioned in the same breath, but they are not the same. That difference is more than a botanical detail: the right planting time, hardiness and aftercare determine whether a type establishes well and returns later. So you treat a tulip or daffodil differently from a dahlia or gladiolus. If you are unsure which you have, our guide to the types of bulbs and tubers will help you tell them apart.
You can see that in practice too. Spring-flowering plants such as crocus, daffodil, tulip and allium are planted in autumn, while dahlias and gladioli go into the ground in spring. Autumn crocus differs again in its own way. If you know which type you are dealing with, choosing, planting and storing them immediately becomes much easier.
The difference between bulbs and tubers
A flower bulb is an underground storage organ with clear layers, a bit like an onion. The plant stores nutrients in those layers, and in the centre is the growing point from which roots, leaves and flowers develop. Tulips, daffodils and alliums are well-known examples of such flower bulbs.
A tuber also works as a store, but it does not have the same layered structure. It is a swollen storage organ in which energy is stored for a new growing cycle. Potatoes are a familiar example, and in the ornamental garden that also applies to dahlias. That is why bulbs and tubers are often mentioned together, even though they are not technically the same.
That distinction is useful because it affects how you plant and store them. With bulbs, the top is often easy to see, while with tubers the orientation can sometimes be less obvious. You also notice a difference when lifting and overwintering: not every type can stay in the ground without problems. In practice, the terms flower bulbs and tubers are mainly used as a collective name, and that is exactly why name confusion often arises.
Common types by season
The easiest way to divide types is by season. That way you can quickly see what gives colour when, and how to keep a border or mix of pots attractive for longer.
| Season | Examples | Useful for | What you can expect from them |
|---|---|---|---|
| Spring | crocus, daffodil, hyacinth, tulip, allium | borders, pots, early colour, cut flowers | Crocus flowers in February-March, daffodil in March-April, tulip in April-May and allium in May-June. That lets you build spring beautifully from early to late. |
| Summer | dahlia, gladiolus, lily, begonia, ranunculus | full borders, pots, cutting garden, cut flowers | These are the types for plenty of colour and volume later in the season. Dahlia and gladiolus in particular are popular as eye-catchers and as cut flowers. |
| Autumn | autumn crocus | a surprise among perennials, natural accents, pots | Autumn crocus brings colour at a time when many other bulb plants are already over. That extends the season in a very different way. |
Looking for show-stopping summer colour? Explore dahlia tubers.
By combining early and late types, you do not just have flowers in one short peak, but variety in the garden from the start of spring to well into the season.
Planting: timing, depth and position
A few basic rules make planting flower bulbs and planting tubers much easier. For a simple walkthrough, see our step-by-step bulb planting guide:
- Choose the right planting time: spring-flowering plants are planted in autumn, from September to November. Tulips can still be planted until mid-December. Summer-flowering plants and frost-sensitive tubers, such as dahlias and gladioli, are planted in spring.
- Make sure the soil is loose: the soil should be airy and drain water well. In waterlogged or frozen ground, bulbs root poorly and the risk of rot increases.
- Follow a practical rule of thumb: plant to a depth of about two to three times the height of the bulb or tuber, with enough space between them. If you can clearly see a point, that usually faces upwards. For specifics per type, check how deep to plant bulbs and tubers.
- Plant carefully in pots too: use airy potting compost, make sure there are drainage holes and water when the compost is dry.
- Do not wait too long after delivery: ideally, plant them quickly. If you do need to wait a little, store them somewhere cool and dry. Forgotten bulbs can often still be planted as long as the ground is still workable.
Leave them in the ground or lift them?
Not everything has to come out of the ground every year. Hardy and naturalising types, such as crocus, many daffodils and often alliums too, can usually be left where they are. Tulips can return, but that result is often less predictable than with true naturalisers.
Frost-sensitive tubers and summer-flowering plants need more attention. Dahlia is the best-known example: for overwintering dahlia tubers, you usually lift them after the first cold spell or once the foliage has died back. You are better not leaving other non-hardy types outside unprotected either. After lifting, store them clean, dry, airy and frost-free, so mould, rot and drying out are limited as much as possible.
After flowering: what now?
When it comes to flower bulbs after flowering, you can safely remove the spent flowers, but leave the foliage in place. That green foliage is needed to build up reserves again in the bulb or tuber. That is exactly how the plant feeds next season's flowering. If you tidy up too early, you are effectively taking away its energy store.
So wait until the leaves turn yellow or brown and start to loosen naturally. Only then is it time to remove them. For spring-flowering plants such as tulip, daffodil and allium, that quiet die-back phase is simply part of the process.
In pots, aftercare is especially important, because flower bulbs and tubers there are completely dependent on what you give them. Do not let the pot dry out completely after flowering while the foliage is still green, and give a little feed if needed. That way, plants in pots also get the chance to recover properly for another round.
Ready to choose? Browse all flower bulbs.