Houseplant Temperature Guidelines
Just as plants vary in their moisture needs, so, too, do they vary in their temperature requirements. Some plants like it cool; some like it hot.
No houseplant wants to freeze or bake. Just like outdoor plants, houseplants need the proper conditions to thrive. Both moisture and temperature are an important factor in your houseplant's life, and unlike the outdoors, you are in control of that.
In order to keep your houseplant healthy, the temperature you should keep your house at depends on the type of plant you're growing. For example, tropical houseplants (like hibiscus or palm varieties) prefer higher temperatures (up to 85°F ) while cool-season plants like Christmas cactus and azalea need cooler temperatures (around 60°F) to properly bloom. Meanwhile, common houseplants like philodendron and snake plant will thrive in normal houseplant temperatures (60°F to 75°F). No matter the houseplant you're growing, all varieties appreciate a 10-degree drop at night. The drop duplicates what the plants experience in nature.
Luckily, your plants have ways of showing you they're not comfortable in their environment. Here are some signs that your houseplant may need an adjustment in their environment:
Leaf Curling and Browning
If your houseplant's leaves are starting to curl and turn brown, the most likely cause is excessive light. If your plant is on a windowsill or next to a large window, try moving it to a spot out of direct light or mute the light with a curtain.
Yellow leaves could be caused by a dramatic temperature drop (meaning 15°F or more) or a cold draft. Play around with your plant's location to see where it thrives best. Another possible cause of yellowing leaves is overwatering or underwatering your plants. Adjust the watering schedule accordingly and observe how your plants take it.
The most common reason for the death of houseplant flowers is frostlike conditions. So if you're keeping your flowering houseplant near a window in the fall or winter, move it! Your plant will appreciate more average temperatures, like anywhere from 60°F-75°F.
The No. 1 way to protect your plants from harm is to place them far from negative conditions. Unless your plant enjoys chilly temperatures (which most don't), keep it away from cold drafts. This includes open windows in cool weather and air-conditioning vents.
On the other hand, most houseplants don't enjoy heat, either. Keep plants away from radiators and heated vents. Not only can hot air cause damage to your plants, but it takes away the moisture in the air, which most plants need to survive.