Assertion: milkweed | /r/HasProperty | needed in large numbers
Facets:
value: to support the monarch butterfly population
type: PURPOSE
Source sentences:
text: While milkweed is needed in large numbers to support and expand the monarch butterfly population, we do not recommend planting tropical milkweed, and further suggest milkweed of any species not be planted within 5–10 miles of monarch overwintering sites in California.