Soil Cold Water

its always best to use room temp. water so you dont shock the roots.

next time fill some jugs and let them sit for a day.
 
I use ice to slow the rate of water entering the soil. In summer months it's just a added bonus to keep the root zone cooler for a few minutes. It would also depend on pot size and room temps but If you water right you are not going to hurt the roots.
 
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