Dahlias are half hardy, so keep them protected from frost. Pot tubers individually between February and April and grow them on in a greenhouse or bright indoor position. Alternatively, start them outside in May, once the risk of frost has passed.
Out of season
Dahlia
'Mondriaan'
Embrace the pastels or use Dahlia 'Mondriaan' to add a contrasting highlight among darker tones. This dahlia not only brings subtle, soft colour to the garden, but a touch of understated elegance to bouquets too. This classy decorative dahlia features semi-double blooms in a soft shade of lemon cream washed with pink on its outer petals. Its beautifully-formed flowers are long-lasting and perfectly sized for flower arranging. The soft pastel tones of Dahlia 'Mondriaan' are easy to match with other gentle colours, and create a calming and peaceful mood in the garden.
Dahlia 'Mondriaan' forms a bushy plant and produces flowers on long, strong stems. The size of the flowers is around 12cm, making this an ideal choice for a cut flower: not too small to be un-noticed, but not too big to dominate. It will produce blooms over a long season in summer and autumn if regularly cut or deadheaded, and if the tubers are protected overwinter, can become a regular annual feature in either containers or borders. In warmer climates, a thick mulch over the Dahlia 'Mondriaan' tubers will often suffice, while in colder areas lifting the tubers and storing them in a cool, frost-free place over winter will help to ensure that these beautiful blooms will grace your garden for years to come.
Quantity
Plant profile
Plant calendar
For planting out later, use a snug-fitting 15–20cm pot filled with peat-free multipurpose compost. For a patio display, plant directly into a container at least 30cm wide and keep it somewhere bright and frost free until it can move outdoors.
Position the old stem facing upwards, with the tubers covered and the stem stump level with the compost. Tubers naturally vary in size and shape and may arrive without visible buds. Bent necks are usually fine if they remain firmly attached, so do not remove them.
Water after planting, then allow the compost to become almost dry before watering again while the tuber remains dormant. Once shoots and leaves are growing strongly, water more regularly, always allowing excess water to drain away.
Plant out after the last frost, once the plant is around 20–30cm tall and its roots hold the compost together. Space dahlias approximately 30–50cm apart in borders, allowing less room for compact varieties. Water thoroughly after planting.
Water regularly during active growth and deadhead or cut flowers often. Dahlias usually bloom from July or August until the first frost, although later-planted tubers may start in late August or September. In autumn, lift, clean and dry the tubers, then store them somewhere cool, dry, airy and frost free.
- Botanical name
- Dahlia 'Mondriaan'
- Flower colour
- Pink, yellow, cream
- Tuber size
- 1
- Established height
- 50-70m
- Established spread
- 30-50cm
- Growing skill
- Easy to grow
- Habit
- Upright
- Hardiness
- Half hardy
- Leaf colour
- Green
- Mouse resistant
- No
- Plant spacing
- 5 tubers per m2
- Pollinator friendly
- No
- Position
- Sheltered
- Rabbit resistant
- No
- Scented
- No
- Soil acidity
- Any
- Soil moisture
- Free draining
- Soil type
-
Loam
Sandy
Multipurpose compost
Loam-based compost - Suitable for
-
Large containers
Borders
Gravel gardens
Coastal gardens
Cottage gardens
Low maintenance gardens
Cut flower gardens - Sunlight
-
Full sun
Partial shade - Toxicity
- No report
- Years to establish
- 1st year
Good for cutting
Perfect for pots
Thrives in full sun
Perennial
Packed in paper
Low maintenance
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