As the saying goes, it all depends ... If you want to mow "over" the edge,
it must be level with the grass or just lower; if there is a path on one
side, how high is the revealed edge? If very high (say 6" or more), you may
be best blocking the edging with mortar.
I use blocked concrete edging for path to lawn edges, or drive to raised
lawn, and plastic (green, snake effect) for flower bed to lawn. |The latter
has the advantage you can do as you say, dig a slot, and drop it in.
David

"Bob Hoath" wrote in message
...
Hi all

I want to put lawn edging in, and have seen suitable moulded 1/2 round
concrete edging (650mm*150mm) at the local DIY superstore. Is it simply a
case of digging a slot and dropping the blocks in, or is more work
required
to do the job properly. I know this is not plant related, but would
appreciate guidance.

TIA

BobH