posted 5 years ago
I think it depends on how big they get. Which is variable. If you taper off water too soon or don't water much till you have to (me) they can go dormant sooner. If you have less fertile soil. Or otherwise worse growing conditions they won't grow very fast. If you crowd them, again not as big.
So I think it's a function of growth rates, growing conditions and total size. It may also be a function of variety.
I think if they reach a certain size they will make scapes. If not, maybe next year.
Western Montana gardener and botanist in zone 6a according to 2012 zone update.
Gardening on lakebed sediments with 7 inch silty clay loam topsoil, 7 inch clay accumulation layer underneath, have added sand in places.