How to grow dahlias from tubers

Do it:

Mar

Takes just:

30 minutes

At its best:

Aug, Sep

There are three ways to grow dahlias: from tubers, rooted cuttings or seed.

Tubers are the roots of mature plants and look like a cluster of brown, carrot-like roots joined by the previous year's dried stem. You can buy them from garden centres or by mail order in spring, or use your own tubers saved from the previous year.

If you plant them out before all risk of frost has passed then they may die, so plant the tubers in large pots filled with multipurpose potting compost in March or early April. Keep them on a windowsill or in a frost-free greenhouse until late May, when it will be safe to plant them outside.

You will need

Dahlia tubers

Large pots

Multi-purpose compost

Plant labels and pen

Advertisement

When planting, ensure that the joint where the roots meet the stem is facing upwards. Label your pots and grow on in a greenhouse or sunny windowsill. Keep the tubers well watered.

Pinch out the tips of the main shoot, down to the top pair of leaves. You also need to remove most of the shoots growing from the tuber, except for five. This encourages bushy plants, strong, vigorous growth and a lot more flowers. 

When all risk of frost has passed, harden off plants by placing them outside during the day and bringing them in at night. After a week they will be ready to plant out into their final growing positions. 

Advertisement

Discover more ideas and inspiration

Related content

How to grow dahlias from rooted cuttings

How to grow dahlias from seed

How to plant heleniums

Related offers

FREE P&P

Subscriber only content

Save on hardy geraniums

Buy a collection of six bare-root hardy geraniums for £14.99 (saving £15), or save £40 when you buy the 12-plant collection for just £19.98. You'll also get free p&p.

Unlock now

SAVE 10%

Subscriber only content

Save on winter flowers

Winter needn't be a dull time in the garden - subscribers can enjoy a 10% discount across the fantastic range of bright winter flowers at Crocus.

Unlock now

HALF PRICE

Half price nerines

Plant nerines this spring and enjoy their vivid colour in autumn. With this offer, you'll get the collection of 20 nerine bulbs (five each of four beautiful varieties) for just £16.98, saving 50% on their usual price.

Order now