Newly planted trees, shrubs, perennials, and roses must receive 1 inch of water per week throughout their root zones. This is especially important in hot, dry weather.
Continue to cultivate and weed. The return of hot weather will certainly push weed growth.
If not done yet, mulch garden beds immediately after weeding with 2 to 4 inches of shredded bark. This is the best way to retain moisture and keep weeds under control.