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Dahlia Tubers

Dahlia Tubers

Flowers until the first night frost.

A blue dahlia does not exist. Growers have been trying for two centuries, but the plant simply does not make the pigment, so everything from white to nearly black is possible and blue is not. They flower from July until it turns properly cold, and the more you cut, the more come.

401 varietiesflowers July to Octoberfrom €1,80

Flowering month
401 products

Hand-picked for quality and size.

If you want early flowering, start the tubers indoors in a pot from February or March and put them outside in mid-May. Plant the tuber 10 to 15 cm deep. Low kinds go about 30 cm apart, tall ones 50 to 60 cm. Full sun matters: at least six hours a day.

Keep cutting off spent flowers and the plant makes new ones. Give tall kinds a stake, and pinch out the top once when the plant is about 30 cm. That makes it fuller.

After the first night frost the leaves turn black. Then lift the tubers out of the ground, cut the stem back to about 10 cm, let them dry and store them cool and frost-free in a box with peat or sand.

Practical: Dahlias are not hardy here. Do not plant the tubers until mid-May, once the soil is above 10 degrees, and lift them after the first night frost. They range from 30 cm in a pot to a metre and a half at the back of the border. If you want to help bees with them, choose the kinds with an open heart.

At a glance: Dahlia Tubers

Variety Flowering months Height Planting depth Planting distance
Dahlia Missis Dutch july to october 90 cm 10 cm 50 cm
Dahlia Black Narcissus july to october 90 cm 10 cm 50 cm
Dahlia Joyfull Investment july to october 90 cm 10 cm 50 cm
Dahlia Blue Bayou july to october 80 cm 10 cm 50 cm
Dahlia Bacardi july to october 80 cm 10 cm 50 cm
Dahlia Cornel july to october 80 cm 10 cm 50 cm
Dahlia Copper Boy july to october 100 cm 10 cm 50 cm
Dahlia Sturm Sweet Maria july to october 80 cm 10 cm 50 cm
Dahlia Gelia july to october 80 cm 10 cm 50 cm
Dahlia Karma Naomi july to october 80 cm 10 cm 50 cm
Dahlia Marble Ball july to october 80 cm 10 cm 50 cm
Dahlia Evanah july to october 45 cm 10 cm 50 cm
Dahlia Daisy Duke july to october 100 cm 10 cm 50 cm
Dahlia Richards Fortune july to october 45 cm 10 cm 50 cm
Dahlia Lindsey Michelle july to october 90 cm 10 cm 50 cm
Dahlia Seattle july to october 80 cm 10 cm 50 cm
Dahlia Sam Hopkins july to october 80 cm 10 cm 50 cm
Dahlia Pure Happiness july to october 80 cm 10 cm 50 cm
Dahlia Lindas Baby july to october 110 cm 10 cm 50 cm
Dahlia Maki july to october 80 cm 10 cm 50 cm
Dahlia Romance july to october 80 cm 10 cm 50 cm
Dahlia Park Princes july to october 50 cm 10 cm 50 cm
Dahlia Nicholas july to october 80 cm 10 cm 50 cm
Dahlia Diana's Memory july to october 70 cm 10 cm 50 cm