How fast does sedum grow? Heucheras?
I planted a row of sedum spaced 15 inches apart (Florida Friendly gold) with a row of heucheras 24 inches apart approximately 18 inches behind the sedum. How fast should I expect them to grow in toward each other and fill in the gaps? I plan to mulch soon but if I want them to fill in should I mulch at all in those areas? They are in an area of landscaping that is about 40 feet wide and previously had mulch and that is all. I ripped out the old mulch and put these in. I would like them to eventually be a true border.
I am in zone 9B.