Stipa nuttalliana Steud.
Stipa parviflora Nutt. ex Steud.
Stipa viridula Trin.
Common Name: Green Needlegrass
Nassella viridula is a perennial, clump-forming grass that can grow around 50 - 110cm tall.
The plant is harvested from the wild for local use as a medicine..
Northern, western and central N. America - Yukon and Northwest Territories, south to Califormix, Arizona, New Mexico and Illinois
Plains and dry slopes[
Easily grown in an ordinary well-drained garden soil in full sun[
]. Succeeds in dry soils.
The plant has a narcotic effect on the spinal cord and brain[
Seed - sow early spring in a greenhouse and only just cover the seed. Germination should take place within 2 weeks, but make sure that the compost does not dry out. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in early summer. The seed can also be sown outdoors in mid spring.
Division in spring. Larger divisions can be planted out direct into their permanent positions. We have found it best to pot up the smaller divisions and grow them on in a lightly shaded position in a cold frame, planting them out once they are well established in the summer.