Yea I noticed my strawberries were not making any progress on the fluffy potting soil then when i put them on the clay soil they just burst with new leaves runners and strawberries at the moment they all stoped producing strawberries but all have lots of runnersI am growing them as well, have quite a few of these long planters with strawberries, right next to it is a kiddie pool with strawberries, loading up for the 2nd time this season. Even with the heat they are still producing and I have them in full sun, I think strawberries like a heavier soil. And they LOVE water.