Thermopsis are hardy perennials. They range from 30 cm to 1.5 m (1 to 5 feet) in height.
Plants bloom from late spring to summer, when they carry yellow flowers resembling those of peas.
Some of the common names for Thermopsis include goldenbaner, Aaron's rod, False Lupine, and Carolina Lupine.
Thermopsis montana by peganum.
Some of the main species of this plant are Thermopsis lanceolata, Thermopsis montana, Thermopsis villosa, Thermopsis caroliniana, and Thermopsis rhombifolia.
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. This location should have a gritty soil, with pH 5.5 to 7.
If starting off indoors, then sow Goldenbanners, Aaron's rod, and similar seeds into peat pots. Do this about seven weeks before the last frost is expected.
The seeds should first be chipped. Then they 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, transplant the young plants outdoors following the last frost of spring. Space out at about 50 to 60 cm apart (20 to 24 inches).
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. That said, you can attempt to propagate by division in the spring.
I hope that you enjoyed this guide on how to grow Thermopsis plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Sweetpea and Dolichos plants.