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FlowersTenderPerennial (short-lived)
Dahlia
Dahlia is a tender tuberous perennial grown for richly coloured flowers in an exceptional range of forms, sizes and planting styles. It is one of the strongest late-summer performers for borders and cutting gardens when given warmth, fertility and regular picking.
Basic information
Category
Flowers
Lifecycle
Perennial (short-lived)
Hardiness
Tender
Planting partners
0 companions · 0 crops to avoid
Growth profile
Germination window
7–14 days
Germination temperature
18–22 °C
Plant spacing
60 cm
Row spacing
75 cm
Sowing depth
2 cm
Height
120 cm
Spread
60 cm
Calendar
JJan
FFeb
MMar
AApr
MMay
JJun
JJul
AAug
SSep
OOct
NNov
DDec
Sow Indoors
Sow Outdoors
Plant Out
Flowering / Harvest
Timings based on average frost dates in the UK. Sign up to set your frost dates.
Care tips
Plant dahlias into fertile well-drained soil after frost risk has passed, pinch the tips of young plants if bushier growth is wanted, and support taller varieties before flowers appear. Deadhead or cut flowers regularly, feed as buds develop, and lift or protect tubers in colder areas.
Common pests
Slugs, earwigs, aphids, powdery mildew.
Companions
No companion crops have been added yet.
Don’t grow with
No crops to avoid have been added yet.