I had another idea. This way of weaving in threads keeps the edges of the square intact. See the first idea here.
Finish off in the normal way by slip stitching into the third chain and drawing the thread through the loops on the hook. Yarn over, cut off the wool then draw the end through the loop.
Turn the square to the wrong side and weave the end in the back of the Vs (ie the side nearest you). Weave through about five stitches.
By just weaving in the back stitches the edge of the square looks unaltered.
When I start a new colour I also try to get rid of the loose end. Pull a loop through where you want to start. No need to knot.
Work your first three chain but crochet in the loose end aswell.
Another six squares done. I'm aiming for 360! Still
a few a lot to go.
PS Thank you for your help in identifying the flowers. I'm going to hunt for my flower book this afternoon.