

Watson's Amaranth Amaranthus watsonii
Watson's Amaranth is an annual wildflower native to the lower 48 states. It blooms Apr – Oct.
More about this plant
Amaranthus watsonii is a species of amaranth known by the common name Watson's amaranth. It is native to the southwestern United States and northern Mexico, where it grows in sandy places such as deserts and beaches, and disturbed areas. It is also known as a rare introduced species in parts of Europe. This is an erect annual herb producing a glandular hairy stem to a maximum height of about a meter. The leaves are generally oval-shaped and up to 8 centimeters long, with a petiole of up to 9 centimeters. The species is dioecious, with male and female individuals producing different types of flowers. The inflorescence is a long spike cluster of flowers interspersed with spiny green glandular bracts. The fruit is a smooth capsule about 2 millimeters long that snaps in half to reveal a small shiny reddish black seed. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 10 derived from its U.S. range
- Lifespan
- Annual
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts ~29 caterpillar species
Amaranthus supports ~29 caterpillar species.
Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a moderate genus.
Recorded feeding on Amaranthus in North America, including:
+ 8 more species → ↑ show fewer
Sources for this entry (15) Open & cited
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