Originally Posted by
Chumley
Hi Spencer,
Had the same deal a few years ago - you can approach this on several levels.
First you could simply dig a shallow trench and bury the bricks so that the top of the bricks is the same height as the base of the grass - gives you a mow strip, does the basic separation, is simple to do, but the grass will make a mess of it over time growing between the bricks (did this first time around), and the garden bed will tend to spill over onto the grass if you add mulch/chips/whatever and/or have kids/dogs running around.
Then you could do the same and mortar the bricks in place - more solid, better barrier for the grass, but same problems with the other stuff above.
What I ended up doing was digging a trench about 100mm deep and twice the width of a single brick, filled this with concrete (no need to get carried away with the strength of the mix, so could be more mortarish than concrete), then laid the single row of bricks on the garded bed side of the concrete strip. The still gave me a mowing strip, the extra height meant the garden bed had more height to play with before spilling over and the mortar made the whole thing nice and solid.
In hindsight I would have put 2 layers of bricks in as a couple of the bricks worked loose - both were at corners were people hit them with shoes/bikes/wheelbarrows/etc - figure a second layer would have added strength.
I was very happy with the result. I tied it into a small retainer wall at one end and a low curved wall at the other that bordered a concrete slab with a 'sports wall' for the kids. It was more work than I thought but worth it in the end.
Cheers,
Adam