Extreme temperatures during summer in the Arizona desert make it a challenge for gardeners. June through August are the most extreme months for heat. Your plants may start to yellow or look droopy. Do not add more water to planters if the leaves start to look droopy at the end of the day. Take a look at them in the morning and if they are still drooping, then it is time to increase your watering. Otherwise, the sun, heat and salt in the soil are causing the drooping leaves. You want to water deeply enough for the salt to wash away from the soil but too much water will cause root rot. To help the plants look their best and keep the ground cool and moist, try adding some mulch. Be careful to keep the mulch away from the stems of the plants as much as possible and water your plants in the evening or early morning during the summer. The draw back to evening watering is mosquitoes.
Another great idea for your plants is to install a patio misting system or greenhouse misting system. Plants on the patio will love the moist air from your patio misting system and it will keep your patio 10-20 degrees cooler. Call Arizona Living Landscape for your next misting system. 480-390-4477
Try these ideas for color around your flower bed from Home Depot. Annuals for summer heat