It’s still cold and wintery, so let’s imagine ourselves in a happy place…warm, sunny, dry…with dead lawns.
As the photo shows, the turfgrass is dead; this happens every summer during the Pacific Northwest’s droughty summers. Yet many of the weedy species are obviously thriving. Why?
Remember, this is a physiology quiz. You can discount herbicides, fertilizers, etc. This is a cool (no pun intended) adaptation that many species native to dry, subtropical to temperate environments possess. And there are serious implications for water use related directly to this adaptation, or lack thereof.
Let’s see lots of brainstorming on this – no points deducted for trying! (And if you are a true ecophysiology geek, let other people try first before posting the answer.)