Beat the Heat: Keeping Plants Alive at the Height of Summer

By: Elisabeth Lawton

This past June saw a merciless heat wave sweep through the country, particularly the southwest region of the United States. Here in New Mexico, we reached temperatures of up to 105°F during a time when the highs normally sit in the mid 90°s. Heat advisories were issued, suggesting everyone stay indoors. Despite it all, the garden continued to grow. It will always require care and attention in any weather. If you are feeling the heat, it is guaranteed that your plants are too. There are steps that you can take to protect your plants even in the hottest and driest of climates. Here in the Desert Oasis Teaching Garden we are very familiar with this struggle, and have some good tips to share.

 The DOT Garden is always growing

When trying to keep plants cool, take action to lower the temperature of the soil. Soil can easily trap the heat of the day and lose moisture in extreme temperatures. To shade and protect the soil as well as keep moisture inside, place a decent layer of mulch on top of the soil and around the base of the plants. The DOT Garden often uses the leaf litter from previous autumns as an effective mulch. It will also be important to water thoroughly with cold water. The cold water will lower the soil temperature and replace the moisture that has rapidly evaporated away. However, if watering with an outdoor hose, make sure you check the temperature of the water coming out of the hose before you begin soaking your plants. A dark hose laying in the sun will heat the water inside to burning temperatures; in some cases, you must run the hose for a few minutes before the water reaches a good temperature. You do not want to scald your plants or boil your soil!

The water sitting inside this hose is hot and will damage plants.

Managing sunlight exposure is another important method of controlling temperature. Plants can burn in direct sunlight just like we can, so provide shade in whatever ways work best for you. Choosing a garden location that receives plenty of morning sunlight none of the ruthless afternoon rays will already give you an advantage. However, if this is impossible, building shade structures will also work to protect your plants. Using white row cover or other shade sheets are a good method because they will reflect the sunlight and are easy to take down and move around to meet your garden’s needs.

White row cover shields our delicate lettuce.

Between the natural extreme temperatures of the desert and the uncertainty of the weather due to climate change, gardening during the peak of summer can be a grueling challenge. However, make sure to show the same care to yourself as you do to your plants: drink plenty of cool water, protect yourself from the sun, and rest frequently in the shade. The bountiful harvest at the end of the summer growing season will be a well-earned reward.

 

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