I'm about to put in a flat of Dymondia, which I'm using on a seldom-used path to a side fence instead of stepping stones. I'm assured that after it takes hold and the individual parts merge, it's trouble & maintenance free.

Nursery guy was very emphatic that I put down "pre-emergent" whatchacallit AFTER the flat is in. Says I'll be sorry if I don't as weeds will (my term) overwhelm the ground cover.

I've never used this stuff, so nervous about putting it on top of the Dymondia.

Any experience out there?

This is So.Calif coastal

TIA

HB