Growing astragalus in the US is definitely possible, but it does depend on the region you are in. Astragalus is a versatile herb that can be grown as a perennial in USDA zones 6-11. This means that if you live in these zones, you can expect astragalus to come back year after year without much effort.
However, I must note that I have personally had success growing astragalus as a perennial even in zone 4, which is known for its harsh winters. So, while it may not be guaranteed to survive in colder regions, it’s worth a try if you’re interested in growing this herb. Just be aware that it may not come back year after year and should be treated as an annual in these areas.
In terms of planting, astragalus can be grown from seeds or purchased as young plants from nurseries. If starting from seeds, it’s best to sow them in the spring after the last frost. Prepare the soil by loosening it and removing any weeds or debris. Sow the seeds about 1/4 inch deep and cover lightly with soil. Keep the soil consistently moist until germination occurs, which typically takes around 2-3 weeks.
When it comes to the ideal growing conditions, astragalus prefers full sun, but it can tolerate some light shade. It also thrives in well-draining soil that is rich in organic matter. If your soil is heavy or clay-like, consider adding compost or other organic amendments to improve its drainage.
Once the plants are established, they are relatively low maintenance. Watering should be done regularly, but be careful not to overwater as astragalus doesn’t like soggy soil. It’s also a good idea to mulch around the plants to help retain moisture and suppress weeds.
In terms of harvesting, astragalus roots are typically the most sought-after part of the plant. However, they take a few years to develop fully, so if you’re growing astragalus as an annual, you may not have a chance to harvest the roots. The leaves and flowers can also be harvested for medicinal purposes, so feel free to trim them as needed throughout the growing season.
Astragalus is a wonderful herb to grow in your garden if you live in the appropriate USDA zones. It has a long history of medicinal uses and can also attract beneficial insects to your garden. Give it a try and see how it thrives in your specific region!
