A pink Art Nouveau grabs the center of attention amid Purple Haze dahlias.© Jo Ellen Meyers Sharp
Dahlias have never been a favorite of mine, mainly because they always seemed persnickety — prone to mildew, rot and spider mites to name a few challenges.
But this year, Longfield Gardens [1] offered to send me some samples of these tender tubers, and, well, you can never have too many plants to try.
I was about a month late when I planted them up in containers in June. Even though July was cool, the plants took off and started their season of bloom. And did they ever. Maybe enough to change my mind.
For one thing, they are still going strong, long after other annuals have taken on a tired look. They likely will keep blooming until frost. And no sign of mildew, although a little damage from mites.
Dahlias come in many colors, forms and sizes, as large as dinner plates, which usually need staking, and others more diminutive.
Mine are border anemone dahlias, reaching 18 to 24 inches tall with flowers a bit bigger than a golf ball. Although not long-stemmed, they are tall enough for small cut flower arrangements.
When it comes to fall, we have two options: leave them in the ground and let nature take them, or dig the tubers for winter storage.
If digging, wait until the tops of dahlias are killed by frost. Discard any damaged tubers. Rinse the soil from the healthy tubers. Many dahlia experts recommend treating tubers with a fungicide, such as sulfur powder, before storing. Allow to dry, wrap in plastic or place in bags of wood shavings or similar material. Store the tubers out of light, where they won’t freeze or get so warm the they sprout.
In past years, I’ve moved dahlias, pot and all, to my basement for the winter, where they go dormant and require no water. In spring, I move the pot to my enclosed porch to acclimate the plants to more light and begin watering. They go outdoors in mid May.
In early April, take the tubers out of winter storage and plant in pots and place in a bright area indoors. Fertilize with a water-soluble product, according to label directions. In mid May, transplant dahlias outdoors in the garden or in containers. Dahlias do best in full sun or light shade in well-drained soil.
For more information about growing dahlias, check out the American Dahlia Society [2]. Elkhart has the only Indiana chapter.