Why white dahlias mark so easily
White is the hardest dahlia colour to keep looking fresh. Strong Australian sun scorches the outer petals, and rain or irrigation spray leaves brown spots on the edges. A position with morning sun and some shade in the hottest part of the afternoon helps a lot, especially in Adelaide, Perth and inland districts.
Types worth looking at
Dahlias are grouped by flower form rather than colour, and white comes in nearly all of them.
- Pompon and ball types give tight, round white heads that hold up well.
- Waterlily forms are flat and open, with a softer look.
- Cactus and decorative types have longer, pointed or broad petals.
- Dinner-plate types can reach around 25 cm across and need firm staking.
Bridal and sympathy work
White dahlias turn up in wedding bouquets and in funeral tributes, since white is a traditional colour of purity and remembrance. They are strongest from January to March, which is when many Australian weddings are held.
What white dahlias ask of the grower
Plant tubers in spring after the frost risk has passed, in sun with free-draining soil. Mulch to keep roots cool. Watch for powdery mildew on white flowers and foliage in humid weather, and for two-spotted mite when conditions are hot and dry. Water at the base rather than over the blooms.
Pets and white dahlias
The ASPCA names dahlias as a plant that can harm dogs, cats and horses. The usual effects are a mildly upset stomach or irritated skin. If your animal has been chewing the plant, a vet can tell you what to watch for.
