Planting Spring Bulbs in Containers for Early Colour

Why containers earn their keep

Spring bulbs in the open border are a gamble. The ground is cold, drainage is often poor, and a wet January can rot a tulip before it ever thinks about flowering. A container sidesteps most of that. Pots sit above the frost line, they warm up far quicker than soil, and you can move them somewhere sheltered when the weather turns nasty. Best of all, they can be shifted into full sun in February, right where you walk past them every morning.

The other advantage is control. If you want colour on a doorstep, by a back door or on a balcony, a pot gives you exactly that without waiting five years for a border to fill out. Bulbs are cheap, generous and forgiving, which makes them the ideal thing to tuck into a container in autumn.

Choosing bulbs that suit a pot

Not every bulb plays nicely in a container, but plenty do. Pick a mix of heights and flowering times so the pot keeps giving from February through to May.

• Crocus and Iris reticulata — the earliest of the lot, often flowering in February. Small, so plant them shallow and use plenty.
• Daffodils and narcissi — reliable, long-lived and happy in pots for several years. Choose a compact variety for smaller containers.
• Tulips — the stars of April and May. Treat them as annuals in pots; most perform poorly in a second year and are best replaced each autumn.
• Muscari and miniature alliums — wonderful for filling gaps and giving a rich blue or purple note.
• Snowdrops and winter aconites — best bought as bulbs "in the green" in spring, but small pots of them establish well.

Buy firm, fat bulbs and reject anything soft, mouldy or lightweight. Size matters: a decent tulip bulb should feel like a small onion in the hand.

Compost, drainage and the art of layering

Good drainage is everything. Use a peat-free multipurpose compost mixed with one part horticultural grit to four parts compost, or a loam-based mix if you prefer something heavier. Choose a pot at least 30cm deep with a proper drainage hole, and stand it on pot feet so water never sits underneath.

Now for the trick that makes containers look lavish: layering, sometimes called lasagne planting. Fill the pot with compost to the depth of your deepest bulbs, then work upwards in bands.

• Bottom layer: tulips and daffodils, planted at roughly three times their own height — about 15–20cm deep.
• Middle layer: muscari and smaller narcissi, covered with 5cm of compost.
• Top layer: crocus and iris, just 7–8cm deep.

Space bulbs so they are almost touching but not pressed together. Finish with 3–4cm of compost above the top layer, leaving a couple of centimetres of rim clear for watering. One 35cm pot can hold 40–50 bulbs this way, and the result in spring is a dense, layered display rather than a few lonely stems.

Watering and the first few months

After planting, water once gently to settle the compost, then leave it alone. This catches out most beginners: autumn bulbs do not want to be kept damp. Water sparingly, only when the compost feels dry a couple of centimetres down, and rely on rainfall for the rest. Soggy compost in November is the quickest route to rotted bulbs and a disappointing spring.

Position pots somewhere cool but sheltered from the worst of the wind and rain. A cold frame, an unheated garage or the sheltered side of a shed is ideal until January, when you can move them into the light. As shoots appear, increase watering a little, but never let the pot sit in a saucer of water.

Squirrels, mice and other thieves

Squirrels dig up freshly planted bulbs with infuriating enthusiasm, and mice will happily nibble tulips in storage or in the pot. A few simple defences work well.

• Top-dress with grit. A 1cm layer of sharp grit or gravel hides the scent and makes digging awkward.
• Make a wire cage. Bend chicken wire into a dome and peg it over the pot rim until shoots push through.
• Plant deeper. Squirrels rarely excavate beyond about 10cm, so keep tulips and daffodils well down.
• Try a scent deterrent. Chilli flakes, garlic granules or crushed holly leaves scattered on the surface often send them elsewhere.

Keep an eye out for vine weevil grubs too, which hollow out bulbs and roots. If a pot collapses for no clear reason, tip it out and check.

Aftercare and getting another year

Once buds show colour, move pots somewhere you can enjoy them, but keep them out of the fiercest midday sun to make the flowers last. Water regularly while they are in growth, and feed weekly with a high-potash tomato feed from the moment the leaves open until they begin to yellow.

Resist the urge to cut foliage early. Green leaves are feeding the bulb for next spring, so let them die back naturally, then either lift and store the bulbs in a cool, dry place or leave them in the pot and top up the compost with fresh material and a slow-release feed. Tulips are usually best composted and replaced, but daffodils, crocus and muscari will reward you year after year. Plant a few pots each autumn, and there will always be something cheerful waiting before the borders have properly woken up.