J
Ornamentals
Dahlia
Dahlia × hortensis
A tuberous plant with large flowers in every colour from July to the first frost.
- Light
- Full sun (6 h or more)
- Height
- 0.5–1.5 m
- Watering
- Moderate: 2–3 times a week in summer
- Soil
- fertile, rich in organic matter
- Edible?
- No: ornamental
- How to plant
- Plant pieces with 2–3 eyes 8–10 cm cm deep, 60 cm apart.
- Care
- Plant after the last frost. Stake tall ones and cut flowers often. In cold areas lift the tubers in autumn.
Calendar by climate
Warm coast
F
M
A
M
J
J
A
S
O
N
D
Mild Mediterranean
J
F
M
A
M
J
J
A
S
O
N
D
Southern interior
J
F
M
A
M
J
J
A
S
O
N
D
Continental interior
J
F
M
A
M
J
J
A
S
O
N
D
Cold interior and uplands
J
F
M
A
M
J
J
A
S
O
N
D
Atlantic
J
F
M
A
M
J
J
A
S
O
N
D
Canary Islands (subtropical)
J
F
M
A
M
J
J
A
S
O
N
D
SowPlantHarvestPruneFeedTreat
Dates are for growing outdoors, based on the local climate. In a greenhouse or tunnel everything comes earlier.
Feeding and doses
Mild Mediterranean
- Organic granular fertiliserJun, Aug50–80 g / m²
Pest prevention and doses
Mild Mediterranean
- AphidsPotassium soap · Jun10–20 ml / L
Approximate doses: always follow the product label. Spray in the evening, never in full sun or on flowers visited by bees. No sulphur above 30 °C.
How easy to grow by climate
- Warm coastNeeds regular careToo warm a climate
- Mild MediterraneanEasy
- Southern interiorNeeds regular careExtreme summer heat
- Continental interiorEasy
- Cold interior and uplandsNeeds regular careHard, long frosts
- AtlanticEasy
- Canary Islands (subtropical)Needs regular careNo winter chill
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