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Monday, July 3, 2017

Advice During the Heat of Summer

Q. Can you give some tips to on how to survive this latest bout of heat? Is it simply too hot right now for plants? Is shade cloth the answer?

A. It has been hot these past few weeks and very stressful for many landscape plants. There has been a combination of high temperatures, intense sunlight, very low humidity and windy conditions. Just like us, healthy plants have the best tolerance to the extremes of heat and cold. But water and fertilizer can be a killer if too much is applied.

            Shade cloth is helpful in some situations but it is usually for vegetables. Use shade cloth to manage the intensity of sunlight and reduce sunburn on tender vegetables. Shade cloth providing somewhere between 30 to 50% shade is used with these plants. Otherwise, rely on leaves of plants to provide their own filtered light.

Avoid watering trees, shrubs or any plants that are woody every day. Try to give these plants at least one day of rest, without irrigation, between waterings. Some landscape plants have roots that suffocate easily if the soil contains too much water. These plants seem to “die overnight” when watered daily or the soil remains wet.

Mulch helps. Mulch of any kind, whether it is rock or wood chips, applied to the surface of the soil helps cool it, preserves soil moisture and helps battle weeds. Rock mulch applied to the surface of the soil is best for desert species of plants. Woodchip mulch is best for non-desert species of plants. A surface layer of mulch can add one or two extra days between irrigations.