Herbaceous perennial native to the American prairies.
Hardy to -20 degrees F.
Attracts Monarch Butterflies and provides nectar to the bees.
The root (as suggested by the species name) delves deep and is very tough. It has a peculiar odor.
The herb is seldom used in current herbal practice, and is mainly planted for display.
Sow the seed in the early spring.
The seed is a cold-soil germinator. If you are not planting in the early spring, or garden in a warmer climate and warm soil, then it is best to pre-treat the seeds in moist medium in the refrigerator (not the freezer) for 2 weeks before sowing warm.
Germination is relatively fast and quite rewarding, as the seedlings are large and characteristically shaped.
Tap-rooted plants are best sown in-situ, in the garden bed.
Plant prefers full sun and regular watering.
Will survive in low-fertility areas and will cohabit happily with grasses.
These large plants are best spaced at least 2 feet apart.
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