How to Grow Amaryllis: Plant Now for Christmas Flowers

Few houseplants deliver as much drama for as little effort as an amaryllis: one bare bulb, a couple of months on a windowsill, and then trumpet flowers the size of your hand in the depths of winter. The catch is timing. The bulbs flower six to eight weeks after planting, so if you want them open for Christmas, the window to pot them up starts now, in mid-to-late September, and runs to early November. Here's the whole process, from choosing a bulb to making it flower again next year.

Amaryllis or Hippeastrum?

The big-flowered winter bulbs sold as 'amaryllis' are botanically Hippeastrum hybrids from South America; the true Amaryllis belladonna is a hardy autumn-flowering garden bulb from South Africa. The common name has stuck to the houseplant, so that's what we'll call it — but it's useful to know when you're comparing labels.

Buying a bulb

Size matters more than almost anything else: the bigger and heavier the bulb, the more flower stems it carries. A 26 cm+ circumference bulb typically throws two stems with four or more blooms each; bargain-bin small bulbs often manage a single stem or none. Choose bulbs that are firm and dry with no soft patches or blue-grey mould, ideally with fleshy roots still attached.

Planting, step by step

• Soak the fleshy roots (just the roots, not the bulb) in lukewarm water for a few hours to rehydrate them.
• Choose a heavy pot only 2–3 cm wider than the bulb — amaryllis flower best slightly pot-bound, and top-heavy stems tip light pots over.
• Use free-draining compost: multi-purpose mixed with a few handfuls of grit or perlite.
• Plant the bulb with its top third above the compost, firm gently, and water once.
• Put it somewhere bright and warm — around 20°C — and water only sparingly until the flower spike is clearly growing; a soggy, rootless bulb rots.

Care while it grows and flowers

Once the spike is up, water whenever the top of the compost feels dry and give the pot a quarter-turn every few days so the stem grows straight rather than leaning to the light. Tall varieties appreciate a discreet cane. When the buds start to open — typically six to eight weeks after planting — moving the pot somewhere cooler, around 15–18°C and out of direct sun, can double the life of each flower. Individual stems can also be cut for the vase; they last a week or more in water.

Tip: For flowers from Christmas through to March, don't plant all your bulbs at once. Pot one every two or three weeks from late September until January — a small production line of winter colour.

Warning: Amaryllis bulbs, leaves, and flowers contain lycorine and are toxic to cats and dogs (the bulb most of all). Keep pots and stored bulbs well out of reach, and contact a vet if a pet chews one.

After flowering: how to make it bloom again

Don't bin the bulb — amaryllis can flower for decades. Cut each spent stalk down to a few centimetres, but leave the strappy leaves: they spend the next months photosynthesising next year's flowers back into the bulb. Keep the plant bright, water normally, and feed with a balanced liquid fertiliser every week or two. It can summer outdoors in a sheltered, bright spot once frosts are over. In late summer, stop watering and let the foliage die back, then rest the bulb — dry, in its pot — somewhere cool (around 13°C) for eight to ten weeks. Bring it back into warmth and light, top-dress with fresh compost, water once, and the cycle starts again: rest in autumn, flowers in winter.

Troubleshooting

• All leaves, no flowers — the bulb is too small, was overfed with nitrogen, or never had its cool, dry rest period.
• Bulb turning soft with reddish blotches — fungal rot from overwatering or wet compost; unpot, dry it off, and cut away affected tissue.
• Flower stalk flopping — light pot, warm dark room, or no staking; move it brighter and cooler and add a cane.
• Buds forming then drying up — compost allowed to dry out completely mid-growth, or cold draughts.

If your amaryllis (or any winter houseplant) looks off and you can't tell rot from rest, photograph it in PlantMe — the app diagnoses 500+ diseases from a photo and works in 28 languages.