Yes!load those outside girls up with liquid in the mornings to help them make it through these hot days?
I also use ice. You don’t have to worry about the cold on the roots - If it’s a hot enough day to do it, the melted ice is warm by the time it hits the roots!
I put a layer of ice on the surface and let it melt. It keeps things a bit cooler and reduces moisture loss in the soil. Ill do this particularly during the hottest part of the day.
If they're in dark colored pots, you should cover the pots or paint them white- if you can keep the soil cooler, they'll take a little longer to dry out- and the roots won't get toasted from 100 degree+ soil....(that will also cause yellowing leaves, among other things)
I was thinking this exactly!
have mine in milk crates that I wrap an old pillow case around.
I do this w my smaller plants but use a burlap sack to wrap around the crate.
I do the same in the big black plastic pots If I’m flowering in them (But wrap a round the pot like BigD is saying). The burlap sack is a great insulator and you can also soak it in water, which helps keep things cool and slows drying.
Lots of shenanagins, growing outside in pots! Always worth it too