Dahlia

Dahlias in Oxford

Dahlia pinnata

Show-stopping tuberous perennials that provide a spectacular display of colour from mid-summer right up until the first frosts. Ranging from enormous 'dinner plate' blooms to intricate pompoms and open-centred varieties that bees adore, they are a staple of the late summer UK garden.

Height100cm
SunlightFull Shade
WaterHigh Water

Growing Guide

Step-by-step instructions for growing Dahlia

Planting Calendar

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Growing Guide for

Change the guide to see different planting timelines and tips.

Ideal for bedding dahlias and single-flowered varieties (like the Bishop series) or for growing on a budget. These will flower in their first year.

1
Sow Seeds Indoors

1 Feb - 15 Feb

Fill a seed tray with moist seed compost. Sow seeds thinly on the surface and cover with a fine sprinkling of vermiculite or compost about deep. Keep at in a propagator or on a warm windowsill.

2
Prick Out

1 Mar - 8 Mar

When the seedlings are large enough to handle (usually having one pair of true leaves), transplant them individually into pots or cell trays to grow on.

3
Pot On

25 Mar - 4 Apr

As the plants fill their small pots and roots appear at the base, move them into slightly larger containers if the weather is still too cold for planting out.

4
Harden Off

12 Apr - 22 Apr

Slowly acclimatise your young plants to outdoor temperatures. Place them outside during the day and bring them in at night for a week before planting out.

5
Plant Out

26 Apr - 3 May

After the risk of frost has passed in Oxford, plant your seedlings into beds or containers. Space bedding varieties about apart, or larger varieties apart.