Beating Summer Heat Stress in Your Garden
Triple-digit heat can leave plants looking rough—scorched leaves, wilted growth, and that sinking feeling: “Is my plant going to die?”
Don’t prune off scorched leaves yet. Those damaged upper leaves can still shade and protect the growth underneath. Wait until the heat passes and the plant stabilizes—then clean up.
Treat the tips below as a solid rule of thumb, but always watch what your specific plant is telling you. Different plants—and different planting situations—can need different care.
What to do (and what not to do) after a heat wave
-
Water deeply when needed (but don’t automatically water daily)
Our first instinct is to water constantly—but if a plant is dropping leaves, it may not be pulling up water efficiently. Too much water can create a second problem: stressed roots.
Aim for deep, slow soaking that reaches the root zone, then let the soil begin to dry slightly before the next deep watering. If another heat wave is coming, a thorough soak the night before can help buffer stress.
Tip: Check moisture a few inches down—not just at the surface.
-
Feed gently: organic is safest (use synthetics conservatively)
Light feeding can support healthy new growth once temperatures ease. Heavy applications of synthetic fertilizer can exacerbate stress, especially if the plant is already struggling to regulate water.
Organic fertilizers are generally more forgiving and help “coach” recovery without pushing the plant too hard.
-
Mulch to keep roots cooler and slow evaporation
Mulch is one of the best heat-wave tools you can use. It reduces moisture loss and keeps the soil temperature more stable.
We recommend at least a 2-inch layer of compost, gorilla hair, or wood chips (keeping mulch a few inches away from the trunk/stems).
-
Protect new plantings and heat-sensitive favorites
Newly planted material is the most vulnerable. Use temporary shade cloth/screens and protect young bark—especially on fruit trees like avocado or citrus—by shading the trunk or using a trunk-safe whitewash.
Exception: You can usually tidy grass-like plants right away (daylilies, agapanthus, phormium). These handle clean-up better than woody, branching plants.
Soon enough, your plants will be “selfie ready” again.
Your garden may look a little tired in the short term, but most established plants rebound once temperatures return to normal. In Southern California, “normal” is always a moving target—but recovery is very common with patient, steady care.