Leave them lying on a hot driveway until they soften up a bit, then uncoil them.

I stretch them gently as I lay them out and use stakes to hold them in place until they soften up a little.

I make hairpins out of old stiff wire andpin them down if thye are notcooperaytive, or just set a rock on them. Eventually they petrify in place.

I run water through mine for a couple of hours then they lay nice. Julene

I initially use bricks to hold them in place. Then after a week or two the hose will loose that "coil" memory and I can remove the bricks.

Use landscaper stakes. You can obtain these at most hardware stores and they are inexpensive.