How to Store Flower Bulbs Over Winter (Without Losing Them to Rot)

Whether you lifted dahlias before the frost, ordered bulbs early, or found a bargain you could not plant yet, storage decides whether they survive to planting day. Four conditions matter: cool, dark, dry and ventilated.

The right temperature

Aim for 40–50°F. A garage, unheated basement, or a cool cupboard works well. Below freezing damages the bulb; above 60°F and bulbs either sprout early or dry out.

Keep them dark

Light triggers sprouting. Paper bags, cardboard boxes or dark crates are ideal. Clear plastic bags are the worst choice — they trap moisture and let light in.

Dry, but not bone dry

Bulbs need to stay slightly plump. Store them in a breathable medium:

• Dry peat or coir — good general choice.
• Vermiculite — holds a little moisture without being wet.
• Shredded newspaper — cheap and works well for dahlias and gladioli.

Never store bulbs in sealed plastic. Condensation forms, and rot follows within days.

Ventilation

Air must move. Single layers in shallow trays, or net bags hung on a wall, beat a deep box. Check stored bulbs every two or three weeks and remove anything soft, mouldy or sprouting.

What to do before storing

1. Cure for a few days in a dry, airy place out of direct sun.
2. Brush off soil — do not wash bulbs. Water invites rot.
3. Trim foliage and roots once dry, leaving a short stub.
4. Discard damaged bulbs — one rotten bulb spoils a whole tray.

Do not store these the same way

Not every bulb stores alike:

• Tulips and hyacinths: cool and very dry.
• Dahlias and gladioli: need slightly higher humidity; pack in vermiculite or newspaper.
• Amaryllis: store potted and dry, in a cool room, for six to eight weeks — this rest is what triggers the next flower.
• Lilies: best left in the ground; lifted bulbs dry out quickly and should be replanted as soon as possible.

Signs that storage is going wrong

• Soft spots or mould — too humid. Remove affected bulbs and increase airflow.
• Shrivelled, papery bulbs — too dry or too warm.
• Green shoots in December — too warm. Move somewhere cooler.

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