Description from Possibility Place: Prairie Willow is a dwarf willow found on moist to somewhat drier sites. Fall color is yellow. This plant is a classic savanna shrub in that it creates colonies. I have watched this plant get burned several times, and the colony just keeps getting larger. As a matter of observation, I believe true savanna shrubs depend on fire or grazing to form colonies. The outside edge of the colony is damaged by fire while the inside part of the colony is protected and continues to flower and fruit.
Click here for more information: https://www.possibilityplace.com/our-plants/salix-humilis