We have some growing wild & native on our property so I harvested some seed. I have planted them & it took them 21 days to sprout. I have a bunch of babies now. I understand that when faced with competition of other grasses & such as is the case on our property that they tend not to clump or thicken or show up as much. But when planted as "plants" in a bed or such they really "pop" & become clumping & larger than when faced with competition.