Heat Advisory Tips for Plants

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patio umbrellas protect container gardens during record heat. (charlotte ekker wigGIns photo)

Heat Advisory Tips for Plants

We are seeing record-high heat advisories again this summer in USDA Hardiness zone 6b, a time that challenges not only people but animals in our gardens as well. Plants stop reproducing and enter survival mode when temperatures are over 86F. The following are some tips to help us all manage the record hot and humid temperatures:

1. Water Deeply & Early

  • Water early in the morning (before 9 AM) to reduce evaporation.

  • Soak the root zone deeply 1-2 times a week. Underground watering wands help get the water to roots.

  • Use soaker hoses or drip irrigation for efficiency.

  • Water hanging plants mornings and evening; move them into shade or cool garage temporarily.

  • Add water to bird baths daily so birds and other garden residents have access to water.

2. Mulch Generously

  • Water deeply before mulching. Mulch helps regulate soil temperature and retain moisture.

  • Use straw, shredded leaves, wood chips at least 3” deep.

  • Keep mulch away from tree trunks.

  • Apply as a tire surrounding the plants leaving a lower trough towards the center where water can accumulate.

3. Stop Fertilizing

  • Fertilizer encourages tender growth that wilts easily.

  • Pause fertilizing until temperatures are cooler.

4. Provide Shade

  • Use old sheets, row covers, or shade cloth.

  • Move plants into afternoon shady areas.

  • Patio umbrellas help protect plants in containers.

  • Prioritize afternoon sun protection (2-6 PM).

5. Prioritize the Most Vulnerable

  • Focus on seedlings, containers, leafy greens, and transplants.

6. Protect Roots in Containers

  • Bury plastic bottles with holes so watering can get water to roots.

  • Move pots to shade if possible.

  • Group containers and wrap them in light-colored fabric.

7. Avoid Disturbing the Soil

  • Avoid weeding or transplanting during extreme heat.  

8. Mist in the Evening

  • Light evening misting can cool foliage.

  • Avoid misting in full sun to prevent damage.

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Charlotte