Eupatorium are hardy perennials that reach heights between 60 cm and 3 m, making them ideal for use in borders.
They flower from Summer to Autumn with clustered flowers of white, purple or pink, atop heavy foilage.
Some of the names of Eupatorium include Mist Flower, Throughwort, Boneset, Hardy Ageratum, and white snakeroot.
Eupatorium purpureum (Eutrochium purpureum / Kidney root) by Charles de Martigny.
Common Names: Boneset, Thoroughwort, Hardy Ageratum, Feverwort, Joe Pye Weed, Mist Flower, White Snakeroot.
Life Cycle: Hardy perennial.
Height: 20 to 120 inches (50 to 300 cm).
Native: Northern Hemisphere; temperate.
Growing Region: Zones 3 to 8.
Flowers: Summer through to autumn.
Flower Details: White, purple, pink. Rounded. Flat. Fuzzy. Clustered.
Foliage: Mid-green. Perfoliate leaves
Sow Outside: Cover seed. Late summer or autumn from fresh seed. Spacing: Small 12 to 20 inches (30 to 50 cm); Large 24 to 48 inches (60 to 120 cm).
Sow Inside: Germination time: one to three months. Temperature: 55°F (13°C).
Nine or ten weeks in advance. Transplant outdoors following the last frost or at the beginning of autumn.
Requirements and care: Full sunlight or light shade. Soil pH 5.0 to 6.0. Ordinary soil, moist soil. Summer mulch. Cut back to the ground in autumn. Needs to be divided every three years to maintain vigour. Self-seeds; Propagate: by dividing in the spring in cooler regions and the autumn elsewhere.
Miscellaneous: Traditionally Eupatorium perfoliatum was used as an herbal medicine in the treatment of dengue fever.
The seeds of Eupatorium should be planted outside in the autumn using fresh seed; simply cover the seed lightly with topsoil. Mist flower and other Eupatorium like to grow in a sunny or partially shaded part of the garden. they like a soil that is moist and acidic (pH 5 to 6). If you plan to first grow Mist flowers indoors then they should be prepared about ten weeks before they are due to be put in the garden (either after the last frost of spring or in the autumn). They take from between one to three months to germinate at a temperature of about 13 degrees centigrade. Once ready for transplanting the Eupatorium should be spaced at about 40cm apart (smaller species) or 75cm to 1.25M apart (larger species).
If you require more Mist Flower plants then they can be propagated by division in the august. Eupatorium plants should be cut back to the ground at the end of flowering in the Autumn and divided every three years to keep them looking fresh.