How to lift and store dahlias

How to lift and store dahlias

Find out how to lift dahlia tubers in autumn, and how to store them over winter, with advice from Alan Titchmarsh

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
At its best
At its best

Plant is not at its best in January

Plant is not at its best in February

Plant is not at its best in March

Plant is not at its best in April

Plant is not at its best in May

Plant is not at its best in June

Plant is at its best in July

Plant is at its best in August

Plant is at its best in September

Plant is not at its best in October

Plant is not at its best in November

Plant is not at its best in December

To do
To do

Do not To do in January

Do not To do in February

Do not To do in March

Do not To do in April

Do not To do in May

Do not To do in June

Do not To do in July

Do not To do in August

Do not To do in September

Do not To do in October

Do To do in November

Do not To do in December

Dahlias are beautiful, tender perennials that flower from summer into autumn, providing a long season of colour and interest. They are grown from tubers, which look like a cluster of brown, carrot-like roots joined by the previous year’s dried stem.

After flowering, dahlias start to rot back into the ground and the nutrients from the plant are returned to the tubers, which remain in the ground over winter and start growing again in spring. However, because dahlias are tender they don’t reliably survive British winters. You may be lucky if you live in the south – after cutting back the stems, simply apply a thick mulch at the base of the plant to protect the tubers from frost. But if you live in the north or if you experience a particularly long, cold winter, your dahlia tubers may rot and have to be replaced.

So, while you could take the risk and replace them if they rot, you can guarantee your dahlias getting through winter by digging them up and storing them. Then simply replant them in May, when all risk of frost has passed.

Watch this short video, where Alan Titchmarsh shows how to dig up and clean your dahlia tubers ready for winter storage, and follow our step-by-step instructions below.

Related content:

Learn how you can ensure a fabulous display of dahlia flowers for next summer, whatever the weather, in three easy steps.

How to store dahlias

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You Will Need

  • Secateurs
  • Garden fork
  • Dry compost
  • Storage box or container

Total time:

Step 1

Dig up your dahlias

Once the dahlia foliage has started to die down, dig all around the clump and lift the tubers with a fork, taking great care not to damage them with the fork spikes. Shake off as much soil as you can. Then, using secateurs, cut down the dahlia stems and compost the leaves.

Cutting back dahlia foliage
Cutting back dahlia foliage

Step 2

Rinse the tubers

Use a hose or bucket of water to thoroughly rinse the soil off the dahlia tubers, and then stand the tubers upside down to dry.

Rinsing soil off dahlia tubers
Rinsing soil off dahlia tubers

Step 3

Pack the tubers

Once dry, pack your dahlia tubers in a box or pot, and cover them with dry compost (it’s important to ensure the compost is dry, as damp compost could lead to your tubers rotting in store). You can also store dahlia tubers in vermiculite, or wrap them in dry newspaper. Once packed into their pots, store your tubers in a frost-free place, such as under the greenhouse staging, in a dry shed or garage.

Packing the dahlia tubers in dry compost
Packing the dahlia tubers in dry compost
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If your dahlias are in a warm, sheltered spot in the border and you don’t want to lift them, add a thick layer of mulch for extra insulation in winter.

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