By John Geiger
Prolonged high heat not only impacts our morale and our utility bills, it takes its toll on the landscape, too. But with proper care, you can maintain a beautiful and healthy outdoor space through it all. Here are some tips to help get your plants through.
Mulch
Apply 2-3” of organic mulch (e.g., wood chips, pine straw, leaves) around your plants and trees. Mulch helps retain soil moisture, suppresses weeds, and regulates soil temperature. Avoid over mulching which can impede water filtration and gas exchanges needed for healthy plant root growth.
Water Efficiently
Water your plants deeply and less frequently. Frequent, shallow watering trains roots to remain at the surface where they’re more susceptible to heat, drought and disease. Push your finger in the soil or pot substrate, if it is moist, there is no need to water, but if the soil is dry, apply water. Early morning or late evening is the best time to water, as it reduces water loss through evaporation. Use drip irrigation or soaker hoses to target the roots directly.
Avoid Pruning
Pruning during high heat can stress the plant and increase its vulnerability to pests and disease.
Avoid Fertilizing
Fertilizing during very hot weather can stress your plants further. Excess growth, lots of stems and leaves will outgrow the root system and create stress as the roots try to maintain the plants roots. It’s best to fertilize when the temperatures are cooler.
Weed often
Weeds compete with plant roots for moisture.
Use Water-Saving Techniques
Consider employing rainwater harvesting techniques, such as collecting rainwater in barrels or cisterns, to use for irrigation during dry periods.
Protect Newly Planted Items
Young plants are more susceptible to heat stress. Shield them from direct sunlight and consider using shade cloth or temporary structures until they are established.
Preparing for future heat waves
- Choose Drought-Tolerant Plants: Opt for native plant species that can withstand hot and dry conditions. These plants require less water and are better adapted to our local climate.
- Group Plants Wisely: Group plants with similar water needs together. This practice, known as hydrozoning, allows you to water efficiently and avoid overwatering certain areas.
- Choose Permeable Surfaces: When planning hardscapes like patios and walkways, consider using permeable materials like gravel or permeable pavers. These surfaces allow water to soak into the ground, reducing runoff and supporting soil moisture.
- Shade and Windbreaks: Create shaded areas in your landscape by planting trees, using pergolas, or installing shade sails. These structures not only provide relief from the sun but also reduce water evaporation from the soil. Windbreaks, such as hedges or fences, can also help prevent excessive evaporation.
