How to raise hydrangea at 40 degrees in summer?

Hydrangea 4-degree maintenance method in summer: spray water to cool down.

Hydrangea is most suitable for growing in an environment below 3 degrees. When the temperature reaches 4 degrees, we need to take some cooling measures for hydrangea. The common method is to spray water on hydrangea, and evaporation of water can take away a lot of heat.