What to do when summer heat hits

If you’ve ever watered a planter in the morning and found it drooping by late afternoon, Greenville summer has introduced itself. A pot is a small, hot, exposed world: it heats faster than the ground, dries faster than the ground, and has no deep moisture to fall back on. When the forecast shows a week in the upper 90s, your planters need a different routine.

What to do, in order

1. Water deeply, in the morning. Fill the pot until water runs from the drainage hole, before the day heats up. In a real heat wave, check small pots again in the early evening. Daily watering is normal here in July and August, and twice daily for small containers is not a failure, it’s physics.

2. Mulch the pots. An inch or two of mulch on the soil surface slows evaporation substantially and keeps the root zone cooler. It’s the cheapest upgrade in this article and the most skipped.

3. Move what can be moved. A planter that’s failing in west-facing afternoon sun will often stabilize with nothing more than a slide six feet into bright shade for the worst weeks. Nothing about the planting has to change, just its address. Saucer-dollies under big pots make this a one-hand job.

4. Hold the fertilizer. A heat-stressed plant can’t use food, and fertilizer in hot dry soil burns roots. Feed again when the weather breaks.

5. Accept the afternoon droop, sometimes. Some plants (hydrangeas famously) wilt in late-day heat even with moist soil, then recover overnight. Check the soil before you re-water a drooper: if it’s moist two inches down, the plant is coping, not dying.

Why bigger pots ride it out

The single biggest predictor of how a planter handles a heat wave is the volume of soil in it. Big containers hold more water, heat up slower, and forgive a missed day. Small pots in full sun are on a knife’s edge all summer. If the same planter cooks every July, the fix is a size up, not more heroics.

When something has already cooked

A plant that’s crisped past recovery isn’t coming back to glory in August. Swap it for something bred for exactly this: lantana, angelonia, purslane, vinca and SunPatiens shrug at weeks the rest of the planter barely survives. Our summer guide covers the plants that actually enjoy an Upstate July, which is the long-term answer: next year, plant the heat wave into the design from the start.