While recommendations regarding the ideal timing of watering vary, deep watering is preferred over shallow watering. Morning watering is often prescribed in times of high heat, but wilted plants should be watered as soon as is reasonable to minimize the time spent in a wilted state.
Know your plants' roots:
Mature trees can suffer from heat and drought stress just like smaller plants but may not show symptoms of that stress until much later.
Mulch conserves moisture in the soil by slowing evaporation and minimizing temperature fluctuation in the soil. Shallowly rooted and young plants will be most impacted when the top few inches of soil are hot and dry.
Move containers where they get shade. Provide shade cloth or other means of shade, where possible. Heat stress is compounded when other plant stressors like drought, wind, or intense sun are also present. If using a shade device not typically used for gardening, like a beach or picnic umbrella, consider adding it in the late morning and removing it towards the end of the day so plants get some direct sunlight. Be prepared for plants that are heavily shaded for long periods to “stretch” towards more light. So you can plant your grow indoor and use led grow lights to offer sunlike light.
Leaves take in small amounts of moisture through the stomata or openings in the leaves. In small-scale gardens and home greenhouses, providing additional humidity can be helpful for many plants.
Typically, applying moisture to leaves intentionally is not recommended in the garden: leaf moisture along with the presence of a pathogen and the right temperature increase susceptibility to plant disease. However, in cases of prolonged high temperatures, the benefit of a humid environment probably outweighs the risk of plant disease.
Some strategies for adding humidity could be a morning, light overhead watering to the leaves or canopy, or greenhouse plants. Outdoor container plants can be grouped together and misted with a mist sprayer. A pressurized mist sprayer makes this job easier with large numbers of plants or large plants.
If your plants are indoor, you can use plant humidifier to add humidity for your plants.
Too-warm soil temperatures can kill young seedlings, or cause cankers where the stem meets the soil line. Transplanting is stressful to plants without the added issues caused by high temperatures. Postpone planting or transplanting until cooler temperatures arrive.
Removal of leaves and branches means a new part of the canopy will be exposed to sunlight. In times of intense heat, this can lead to sunburn in leaves that were previously shaded. Trees and shrubs with sunburn in a portion of the canopy will likely recover but will be unattractive in the meantime. Stressed trees are more likely to attract damaging insects like wood-boring beetles.
During periods of intense heat, inducing new growth is not ideal. Wait until a cooler period for this garden activity.
Many treatments for plant disease and insect issues can damage plants when temperatures are consistently above 80F: check the label of a product for specifics before applying. Some plant types such as conifers and succulents can be further damaged by any treatment—even soap or neem oil—applied during extreme heat.
One activity to not postpone in the garden during a heatwave is harvesting. Many plants are better adapted to extremes than ornamental plants: they compete with garden plants for water and nutrients.
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