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How to Store Flower Bulbs Over Winter (Without Rot)
Storing bulbs sounds simple — dig, box, forget until spring. In practice, most losses come down to two variables: moisture and temperature. Get those right and bulbs keep for months.
The two numbers that matter
- Temperature: 5–10°C (41–50°F) for most bulbs. Dahlias and gladioli prefer the warmer end; tulips and daffodils tolerate near-freezing but must never actually freeze.
- Humidity: moderate. Bulbs should feel firm, never wet, never shrivelled. Aim for the texture of a fresh potato.
When to lift
Lift after the foliage has yellowed and died back naturally — usually six weeks after flowering. Lifting while leaves are green robs the bulb of the energy it needs to flower next year.
For tender bulbs like dahlias, lift after the first frost blackens the tops, but before a hard freeze reaches the tubers.
Drying before storage
This step is skipped more often than any other, and it causes most rot.
- Lift with a fork, well away from the stem, to avoid spearing the bulb.
- Brush off soil — do not wash it off. Washing introduces moisture into wounds.
- Cut foliage to 5–10 cm.
- Spread in a single layer in a dry, airy, shaded place for 1–2 weeks.
The storage container
Never use sealed plastic. Bulbs respire and need air movement.
- Best: wooden crate or cardboard box lined with newspaper.
- Good: mesh onion bags hung in a cool room.
- Acceptable: paper bags with ventilation holes.
Pack bulbs in dry peat, vermiculite, or shredded newspaper so they do not touch each other. One rotten bulb can spread rot through an entire box.
Check monthly
Open the boxes once a month. Remove any bulb that feels soft, shows mould, or smells sour. If the packing material feels damp, replace it. If bulbs feel shrivelled, mist very lightly — a few drops, not a soak.
Bulb-by-bulb notes
- Tulips and daffodils: hardy; in zones 3–7 they can usually be left in the ground. Lift only if drainage is poor or you are rotating beds.
- Dahlias: must be lifted in most zones. Store at 5–10°C in barely moist compost.
- Gladioli: lift, dry, and store dry at 5–10°C. Cormels can be saved separately.
- Hyacinths: hardy but prone to rot; if lifting, store very dry.
- Amaryllis: keep in the pot, stop watering, and store the pot dry at 13–15°C.
Warning signs in spring
Before planting, squeeze each bulb. Firm is good. Soft, spongy, or light-as-a-shell means it is dead — discard it rather than planting it and hoping.
Shop fresh, healthy flower bulbs for autumn planting.