How to Grow and Care For Ageratum houstonianum ‘Dondo White’

How to Grow and Care For Ageratum houstonianum ‘Dondo White’

How to Grow and Care For Ageratum houstonianum 'Dondo White'

This tall Ageratum ‘Dondo White’, with its heads of soft, fluffy white blossoms on long stalks, makes it a useful cut flower and an attractive plant for the border. It has a long flowering season that lasts from early summer to late autumn. 2ft (60cm)

Botanical NameAgeratum houstonianum
Common NameAgeratum – Dondo White
Plant Family Ageratum – Floss Flowers
Plant Type Annuals
Height/Spread 6-8 inches tall and wide
ExposureFull sun to partial shade
Bloom TimeLate spring to frost
ColorWhite flowers, green foliage
Hardiness 2-12
Exposure Full Sun, Partial Sun
Water UseMedium Water Use
Season of Interest Summer (Early,Mid,Late), Fall
Watering DetailsRegular watering, 1″ per week
Spacing8-12″ apart
Light NeedsFull sun to part sun
Soil NeedsFertile, well-drained

Germination Instructions

Sow Indoors. Surface sow onto seed compost that is firm, moist, and well-drained. ideal temperature 15-18°C. Light is important because it promotes germination. It takes 10–15 days for germination. Transplant seedlings into 8 cm pots when they are strong enough to handle them so they can continue to grow in cooler environments. Once the risk of frost has passed, acclimate and plant outdoors with a 30 cm spacing. Grows up to 12 inches (30 cm) wide and 24 inches tall (60 cm) 

Best when grown in rich, moist, well-drained soils and in full sun. Has a preference for a little afternoon shade in warmer climates. Maintain a constant moisture level in the soil all through the growing season. Excellent option for city gardens, cottage gardens, beds and borders, and edging. No significant pest or disease problems. Root rot can occur in soils that are not properly drained. resistant to deer and rabbits.

Spread through seed. Simple to grow from seed; begin inside in late winter and move outside once the risk of frost has passed. Alternatively, after the last date of frost, seeds can be planted in the garden.


As they grow, seedlings need regular watering. Before planting, add compost to the soil. Deadheading will promote increased flower production. Use a time-release fertiliser when planting or apply a liquid fertiliser every three to four weeks. Self-seeds.


Cut flowers, flower beds, containers, deer resistance, pollinator attraction.