I have a new Rhododendron and a new Hydrangea which were wilted when I got home today. Today was about 90 degrees. I watered them well, and they perked back up after an hour. Tomorrow is supposed to be even hotter. Should I soak them in the morning again? Is it ok to wait until shrubs/plants begin to sag/wilt before watering them?

water them in the morning or the evening when it is still cool and i believe it is one inch daily while it is hot and 1 inch every other day while it is average temp use a tuna can to measure when its full you have given the plant 1 inch of water don't quote me on this