What Temperature is Too Hot for Hydrangeas?

Temperatures exceeding 90°f (32°c) are too hot for hydrangeas. High temperatures can cause wilting and damage to the plant’s leaves, flowers, and overall health.

Hydrangeas are attractive ornamental plants that require specific environmental conditions to thrive. While they are adaptable to a wide range of temperatures, extreme heat can harm the plant. Sudden temperature fluctuations, direct sunlight, and lack of moisture can all negatively impact hydrangeas. In this article, we will take a closer look at the effects of hot temperatures on hydrangeas and how to protect the plant during heat waves. Additionally, we will discuss the ideal temperature range for hydrangeas and how to ensure optimal growing conditions to promote lush foliage, robust blooms, and healthy growth.

What Temperature is Too Hot for Hydrangeas?

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Understanding Hydrangeas

When it comes to understanding hydrangeas, it’s essential to know the various varieties first. There are five common types of hydrangeas with different blooming times and conditions. If you are seeking to grow beautiful hydrangeas, the right growing conditions are crucial: partial shade, adequate water, and good drainage are essential.

For the blooms to flourish, the temperature should not exceed 75 to 80 degrees fahrenheit. Moreover, certain varieties of hydrangeas may require different seasons and conditions to bloom their best. Therefore, it’s essential to understand the growing conditions and the blooming time of the specific hydrangea variety you choose.

Remember, with the right conditions and care, your hydrangeas will thrive and delight you with their stunning beauty.

Optimum Temperature For Hydrangeas

Hydrangeas are beautiful ornamental plants that require the right conditions to thrive. To ensure they grow healthily, gardeners need to observe the optimal temperature. The ideal range for hydrangeas is between 60°f to 70°f (15°c to 21°c). At this temperature, they can grow robustly, producing beautiful blooms.

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However, if the temperature rises above 80°f (27°c), hydrangeas can perish, resulting in wilted flowers or leaves. Experienced gardeners often refer to a map of heat zones which help them identify the high and low temperatures in different regions. If the temperature becomes too hot, gardeners can provide extra shade with cloth or by watering the hydrangeas frequently.

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Effects Of Extreme Heat On Hydrangeas

Extreme heat can be harmful to hydrangeas. Signs of heat stress may include wilting, drooping leaves, and brown or scorched leaf edges. To save your hydrangeas, try watering them deeply and frequently during hot weather, ideally in the early morning or late evening.

You can also add a layer of mulch around the base of the plant to help retain moisture in the soil. Additionally, consider providing some shade for your hydrangeas during the hottest part of the day, such as with a temporary cover or umbrella.

Maintaining a healthy soil moisture level can help prevent heat damage and keep your hydrangeas looking vibrant and healthy.

How To Protect Hydrangeas From Heat

Hydrangeas are beautiful summer plants that can struggle when temperatures rise above 75 degrees fahrenheit. To protect them from the heat, it’s critical to prune them regularly. Make sure to cut dead flowers or stems, and reduce their size by up to one-third if necessary.

When watering hydrangeas, it’s best done in the morning to lessen evaporation. During heat waves, water them two to three times a week, ensuring that the soil is moist but not soaked. Giving hydrangeas natural or artificial shade is a helpful way to keep them cool on hot days.

Use a shade cloth or cover them with an umbrella. By following these tips, hydrangeas will bloom and thrive all summer long.


Hydrangeas are beautiful, blooming plants that can add so much to any garden. However, if you want to ensure that your hydrangeas thrive, you need to be careful about exposing them to extreme temperatures. So, what temperature is too hot for hydrangeas?

There are a few factors to consider, including the specific type of hydrangea you have, the amount of sunlight it receives, and the humidity in your area. Generally speaking, though, you should avoid exposing your hydrangeas to temperatures above 90°f.

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Doing so can cause wilting, leaf scorching, and other types of damage. Keep an eye on the weather forecast and be sure to provide plenty of water and shade during hot spells to give your hydrangeas the best chance to flourish.


As a gardener, it is essential to understand the needs of your plants to ensure they thrive, which includes knowing the temperature tolerances of each plant. With regards to hydrangeas, they prefer temperatures that are not too hot, and anything above 80°f can result in heat stress.

This can lead to wilting, scorched leaves, and stunted growth. To prevent this, it is advisable to plant hydrangeas in a spot that gets morning sun and afternoon shade or a place where they can receive dappled light. Mulching the soil around the plant can also help regulate soil temperature and moisture, which is crucial during hot seasons.

Regular watering is also necessary to keep the soil consistently moist and prevent heat stress. With these simple precautions, you can ensure that your hydrangeas remain healthy and vibrant, providing you with beautiful blooms all season long.