Why Containers Are Worth the Effort

There is something quietly triumphant about a pot of crocus in flower in February, when everything else in the garden looks grey and reluctant. Containers give you control: over drainage, over position, and over timing. You can shift a pot into the sun when it appears, tuck it against a warm wall to hurry things along, or move it somewhere sheltered when a late frost threatens. Bulbs that sulk in heavy clay — tulips in particular — tend to thrive in fresh, gritty compost in a pot. And for a balcony, a courtyard or a small front step, containers are the only realistic way to grow spring colour at all.

The good news is that this is not fiddly work. An afternoon in September or October will set you up for four or five months of flowers, and the main ingredients are cheap.

Choose Your Bulbs and Plan the Layers

The classic technique is often called lasagne planting, and it works because different bulbs naturally flower at different times and sit at different depths.

• Daffodils are the biggest and go deepest, at roughly 15–20cm.
• Tulips sit in the middle, around 12–15cm down.
• Crocus, grape hyacinths and miniature iris go near the surface, 5–8cm down.

Choose varieties with staggered flowering times so the pot keeps performing: an early crocus, a mid-season dwarf daffodil, and a late tulip will give you colour from February into May.

You will need a generous pot — at least 30cm deep and 30cm across for a decent layer — with drainage holes in the base. Frost-proof terracotta looks lovely, but plastic or glazed ceramic is perfectly fine and much lighter to move. Bulbs should never touch one another or the sides of the pot; leave a couple of centimetres of compost between each layer.

Getting the Compost Right

Bulbs rot in soggy compost, and the single biggest cause of failure in containers is a pot that stays wet. Mix your own gritty blend: roughly three parts peat-free multipurpose compost to one part horticultural grit, by volume. If you would rather not mix, bulb fibre works well, though it holds very little nutrition and you will need to feed later.

A few practical points:

• Put a layer of crocks or gravel in the base to keep the drainage holes clear.
• Stand pots on feet or bricks so they are never sitting in a puddle.
• Add a handful of grit to the top layer too, which deters slugs and stops compost splashing onto the flowers.
• Never use garden soil straight from the border in a pot; it compacts and drains badly.

Planting, Layer by Layer

Start with 5cm of compost in the base, then add the daffodil bulbs, pointy end up, spacing them a bulb's width apart. Cover with compost to the next level, firm gently, and add the tulips. Another layer of compost, then the crocus and any small bulbs, then top up so there is 2–3cm of compost above the highest bulb.

Water well and let the pot drain freely. One caution: squirrels adore freshly planted tulip bulbs and will dig them out within a day. Lay a piece of chicken wire over the surface, or a generous layer of gravel, and they will usually give up.

Tulips can go in as late as November, and many growers plant them then deliberately to reduce the risk of tulip fire. Daffodils and crocus are happier in September and October. In a mild year you can plant right through to early December and still get a good show.

The Cool, Dark Spell

This is the part most people rush, and it is the part that decides whether you get sturdy flowers or a flop. Bulbs need a period of cold to root properly and to trigger flowering. In a warm, bright spot they will produce weak, drawn stems that topple the moment they open.

Move your pots somewhere cool, dark and frost-free: an unheated garage, a shed, a cold frame, or against a north-facing wall behind a piece of cardboard. Aim for a temperature between 5°C and 10°C. Leave them for ten to twelve weeks — crocus often need only eight to ten — and check them every fortnight. Keep the compost barely moist. Too much water is fatal, but bone-dry is nearly as bad, so water sparingly if the surface feels dusty.

Bringing Them Into the Light

When shoots are 2–5cm tall, bring the pots out. Start them in a cool, light spot and let them acclimatise for a week or so before moving them somewhere more prominent. A sheltered position in sun or light shade is ideal. Avoid putting them straight into a warm room; the cooler the conditions, the longer the flowers will last.

Once in growth, water regularly — containers dry out fast, and a dry pot at flowering time means a disappointingly short display. A fortnightly liquid feed from the moment the buds show colour will keep things going. Taller daffodils may need a few twiggy sticks for support, especially in an exposed spot.

After flowering, deadhead promptly so the plant puts its energy into the bulb rather than into seed, but leave the foliage on for at least six weeks until it yellows and pulls away easily. Feed during this period. Daffodils and crocus left in the same pot will often flower again the following year, though they become crowded, so repot them fresh every couple of years. Tulips are best treated as annuals in containers and replaced each autumn — their second-year show is rarely worth the space.

One last thought: plant more than you think you need. A single pot is a pleasant thing, but three, staggered by a fortnight, will carry you from late winter right through into spring.