grasses divide autumn, but i think if you keep the divided new plant well watered it should be ok, as for collecting seed i was looking at my grasses the other day and i noticed on the same plant some of the seed had gone brown and came of easy just by brushing it and on some other part the seed was still green, so i assume when it looks brown and comes off in the hand easy as a guess anyway, has anyone here ever grown grasses from their collected seed before are they true to form