Liatris spicata has long-lasting blooms from summer to the start of fall / autumn. Purple flowers appear on terminal spikes and open from the top downwards.
White Blazing Star plant cultivar 'Floristan Weiss' by Gail Frederick.
The flower-heads are tightly set, and have a tufted, feather-like appearance: this give the plant one of its common names – Prairie gay feather.
Liatris Blazing Star Plant Video Growing Guide
The following Liatris spicata Blazing Star Plant Genus video provides fantastic advice on growing and caring for these beautiful garden plants.
Liatris spicata Growing and Care Guide
Seeds are easiest sown in the autumn as they require cold to germinate. Spring sown seeds should first be nicked with a knife to scarify, and stratified at 40°F (4°C) for about six to ten weeks before sowing. Simply cover seeds once sown. It usually takes three to four weeks to germinate.
Space at about 12 to 18 (30–45 cm). It usually takes a couple of years for plant to fill out to their full spread.
Plants should be located in a sunny part of the garden that has a moist well-drained soil. They do not tolerate standing water or soggy soils. Good drainage is essential for surviving the winter. The soil can be light to average, but will perform best in a fertile slightly acidic soil.
Although Liatris thrive in a moist soil, they are fairly drought-tolerant (though may develop droopiness). Supply an adequate amount of water to keep soil moist, but do not soak Blazing Star plants.
Stake plants to prevent stem breakage: smaller cultivars such as Liatris spicata Kobold and the white flowered Floristan Weiss do not require staking.
Can be propagated by division of tuberous roots in the spring.
Deadhead before seed-set to prevent volunteer seedlings, or let seeds develop to attract finches.
Cut back to the ground in the winter.
If you plan to take cut flowers from Liatris spicata then harvest the flower spikes when around 50–60% have opened. Strip the stems of leaves and then hang upside-down for three weeks in a dry dark place that has excellent air-circulation. For best flower color retention dry in sand or silica-gel.
Liatris spicata is not usually susceptible to pests and diseases, gray mold and verticillium wilt are possible, and rabbits may eat leaves.
Close up of white Liatris spicata flowers, photograph by Manu; CC.