Artemisia Lindleyana, which is also known as Columbia Riverbank Wormwood is a perennial sub shrub. This perennial is a native to North America north of Mexico. This perennial can grow up to a height of 8–30 inches. The stems are erect and the base is woody. The leaves are lance shaped, and are about 1-2 inches length. The leaves are lobed and toothed and with white hairs on its lower side. The flower heads form a spike and are in small bell shaped cups. This perennial is seen along river shores and along streams. It is mostly found in West Gorge, East Gorge, and in Columbia Basin and hence the name Columbia Riverbank Wormwood.
It is known to be a severe allergen. The perennial blooms in late summer.
Growing conditions/Care for Artemisia lindleyana:
• Plant in a sunny location.
• It grows in zones of USDA of 4 and -30° F temperature.
• If sowing the seeds, sow in moist sterile soil and cover with fine sand and peat moss.
• Avoid alkaline soil for this shrub.
• This herb can also be propagated by cuttings.
• Use 3-4 inches long cuttings.
• Rooting should take place in about 4-8 weeks.
• Remove the lower leaves and on the upper side about half of leaves so that the transpiration is reduced.
• This Wormwood needs full sun to partial shade.
• Dig a hole of 6 to 8 inches to plant.
• Add 2-4 inches of compost or manure to the planting soil.
• The plant’s root ball should fit the hole.
• Keep the soil moist and for good growth water occasionally especially in hot and dry weather.
• Fertilize this wormwood using liquid or general fertilizer every spring.
• Mulch the plant around to about 2-3 inches.
• Prune the shrub periodically for encouraging new growth.
• This Wormwood can tolerate poor soil.
• Maintain high humidity to ensure proper rooting.
• This Wormwood is not affected by many diseases or pests.
• Do not keep the plant wet or soggy as it develops root rot.
• Use a well-drained medium like that of 3 parts perlite to 1 part vermiculite or a mix of 1 part potting mix to 2 or 3 parts perlite.