Thermopsis are hardy perennials that range from 30 cm to 1.5 m in height.
They bloom from late spring to summer and carry yellow flowers resembling those of peas.
Some common names for Thermopsis include goldenbaner, Aaron's rod, False Lupine, and Carolina Lupine.
Thermopsis montana by peganum.
The seeds of Thermopsis plants should be sown outdoors just before the last frost of spring or late on in autumn. Once sown, lightly cover the seeds.
Ideally they should be grown in a sunny or partially shaded area of the garden that has a gritty soil of pH 5.5 to 7.
If starting off indoors then sow Goldenbanners, Aaron's rod, and similar seeds into peat pots about seven weeks before the last frost is expected.
The seeds should first be chipped and need to be imbibed by soaking in warm water for a day. It should take from two weeks to a month for them to germinate. Once established plant the young plants outdoors following the last frost of spring at about 50 to 60 cm apart.
It is easy to care for Thermopsis plant species - taller varieties should be staked in windy areas; remove the flowering stalks once they have finished flowering to allow for a second bloom; cut back to the ground in the autumn.
If you require more plants it is probably best to grow from seeds as the plants have a delicate taproot; however if you prefer to you can propagate by division in the spring.
Some of the main species of this plant are Thermopsis lanceolata, Thermopsis montana, Thermopsis villosa, Thermopsis caroliniana, and Thermopsis rhombifolia.
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