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USDA Plant Hardiness Zones

To help gardeners understand which plants will grow well for them, the entire USA has been segmented into ‘Plant Hardiness Zones’. Knowing your zone number is helpful when shopping for plants because:

  • Cold-area gardeners can avoid buying plants that simply won’t survive their lowest winter temperatures.
  • Warm-area gardeners can steer clear of plants that need a period of cold weather in order to bloom again.
Find your Plant Hardiness Zone here.

Caring For Your Garden In Extreme Heat


Summer brings an abundance of blooms, interest and color to the garden, but can also bring extreme temperatures that can be hard on your plants.  For many plants, temperatures above 85 degrees can be a huge stress on their systems. But that’s where you come in: with a few simple steps and diligent attention, your garden will make it through the heat and come out the other side healthier and happier.

Also, if you’re noticing a few bare spots or have lost a couple of plants to the heat this year, there are several annual varieties that thrive in heat and that make a great late-season addition to the summer garden.

Give your containers plants a good soaking once or twice per day in extreme heat.

Caring For Container Plants

You may see the most stress in your container plants in the heat. If possible, water your containers twice per day – once in the early morning and once in the evening – being sure to soak them all the way through. If this isn’t possible due to water conservation efforts, one soak per day should suffice. If your plants are in full sun and aren’t doing well in heat, try putting them in a shadier spot until temperatures cool down.

Caring For Perennials

Water: Unlike container plants, your perennials won’t need a daily dose of water, but a general rule is to try to water them twice the amount you usually do. So if in cooler temperatures you water your perennial garden once per week, try doing it twice per week in the heat. Again, make sure to give the plants a thorough soaking when you water.

Compost: Having a strong level of organic matter, or compost, mixed in with your soil helps the soil retain more water and helps your plants tolerate the heat better.

Mulch: A thin layer of mulch (around 2”) can help your soil retain moisture and protect your plants from drying out in the heat. We recommend using natural mulch from the garden center, grass cuttings or shredded leaves.

It's important to keep your garden weeded during extreme heat so the weeds don't take precious water and nutrients from your plants.

Weeding: Weeds can steal precious water and nutrients from your plants that are extra important during the heat. Make sure to keep your beds weeded, especially in the heat. To help keep you from overheating, we recommend weeding in the early morning or in the evening.

Adding Temporary Shade: Many gardeners in hot climates use temporary shade cloths, sheets or sheer curtains in the hot months to give their gardens a little shade. If you try this method, make sure your plants still have proper ventilation.

Caring For Wildflowers

The best thing about wildflowers is that’s just what they are – wild. Once established, wildflowers can withstand some drought and high temperatures. But if you’re noticing drooping, we recommend giving them a good morning watering every few days in the extreme heat.

Mexican Sunflowers are a great heat-loving annual for the summer garden.

Annuals to Add to Your Garden in The Summer

If you’re looking for an extra pop of color in the late summer but temperatures have been high, consider adding heat-tolerant annuals to your garden:

It’s an undertaking to care for and nurture your garden in the extreme heat, but there's no doubt that it's worth it at the end of the day (or season).

3 thoughts on “Caring For Your Garden In Extreme Heat”

  • shirley laroff
    shirley laroff July 2, 2016 at 9:49 am

    I want Mexican sunflowers. I have planted over and over again these seeds. I believe a certain bird we have in the garden eats the plants as soon as they pop up. Please advise what I can do to protect them.

    Reply
  • Cynthia

    Perhaps make domes of wire, with smaller openings than chicken wire, to go over the plants until they are bigger, or start the seeds in a covered place and set out bigger plants. I wonder what kind of bird this is?

    Reply
  • jerry

    Had a similar situation....did not know what was destroying plant....a senior citizen, who loved plants, told me to try the following....lo & behold, it worked!
    Take a half teaspoon on chili powder,....dissolve in 3 ounces of water,....spray plant....hope it works for you also.

    Reply
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