THE LEAVES ON MY VANILLA STRAWBERRY HYDRANGEA ARE TURNING YELLOW. WHAT SHOULD I DO TO FIX THIS?

The yellow leaves are telling you that it needs a drink of water! Newly planted shrubs often need heavier watering once things heat up for summer. Next year, when it is settled in and has good roots, it won’t need the extra water. For now, give it an extra pitcher of water from time to time until it rains or the temperatures cool down.