The majority of plants that we usually keep indoors reside in tropical or sub-tropical areas. As you know, the conditions in those regions are significantly warmer than the temperature in the rest of the world.

That’s one of the reasons why many plants adapt well to indoor conditions- the inside temperature suits them perfectly. They usually do fine, but in some situations…

My guide on indoor plant temperature will give the answers to some of the most common questions such as what temperature is too cold for plants, what happens to a plant if the temperature is too low, how cold is too cold for house plants and many more.

Stay with me and enjoy my brief research on plants and temperature!

Best Temperature for Plant Growth

Like I’ve already mentioned, the vast majority of plants are perfectly fine with average indoor temp., which ranges from 60 – 75°F (expressed in °C, it’s between 15 – 24).

That makes them an excellent choice for various types of homes and offices, with or without many windows.

Of course, some species need more, some less than that, and that’s where you step in, adjusting those degrees to make your plant feel comfortable.

When it comes to tolerance to too high or too low temperatures, these are three main groups of plants:

  • Perennials, aka heat-tender species do well in temp. around 60 degrees of Fahrenheit (or in °C, around 15)
  • Half-hardy or annuals, as you prefer, which encompasses the majority of types we keep, are okay between 50 – 55 degrees of Fahrenheit (10 – 13°C)
  • Hardy species can grow in temp. of 45 degrees of F (7°C)

As you can see, this categorization is based on their appearance. If you’ve wondered how cold can plant tolerate and what temperature do plants die- it’s below 7°C. No matter how hardy and resistant, it’s too low for them to live and prosper.

Now that you know which temperature range is suitable for plants based on their structure, you will be able to tell what temperature should you bring plants inside. The ideal time is mid-autumn when days become colder (and shorter).

Pro-Tip: Too sensitive or extremely resistant, all plants have one thing in common- they don’t like fluctuations in temperature. So, wherever you keep it, just make sure that the room has a consistent temperature.

A Couple of Dangers that Lurk around Your House

Temperature itself can be harmful only if it’s too low or too high, and if the plant is exposed to such inappropriate conditions for a longer period.

That’s why you need to check the windowsills.

We all like to keep our plants on windows. There’s no doubt that this is the best place, mainly because of the natural source of light. However, when we leave it open and the wind starts blowing, the draft “walks in”.

Draft Can Harm Indoor Plants

When the temperature indoors differs a lot from the outside (which is particularly noticeable during the heating season), it may harm your plant.

Any type of draft, especially the chilly one, is not good for plants, so you need to be careful where you will place the container.  If you still want to keep it near the window, the best would be to draft proof it.

Also, rapid shifts in temperatures or prolonged exposure to any of the extremes are not good for your dear green friends. Some slight changes, let’s say between 5 – 10 °F are not harmful and dangerous, but anything above that is too much for plants. Even the sturdiest ones.

Pro-Tip: When temperatures are higher than the recommended level (above 75°F /24°C) misting can help. By providing more humidity, you will create a balanced environment and your plant will be able to develop properly.

Which Are the Most Common Signs That Temperature Is Inadequate?

Just like with other fields (watering, humidity, light…), your plants will “tell” you if something wrong is going on.

Here’s what to pay attention to:

  • Flowers die quickly: If this is going on, then it might be too warm inside. Consider relocating plants to someplace where the temperature is lower.
  • Foliage is yellowing and falling: This is also one of the indicators that the temperature is not suitable for the plant. To be more precise, it’s one of the signs plants are too cold.
  • Lower foliage drops and wilts, the edges turning crispy and brown: If you’ve spotted this, it’s a signal that it’s too warm.

Pro-Tip: You’ve provided the right temperature for your plant, and it still won’t develop? Then the problem is something other, so consider rearranging your watering schedule, see if it receives enough or too much light, mist it.

Conclusion

I truly hope my house plant guide brought you some valuable insights into how cold is too cold for plants and how to maintain the right conditions for your dear green friends.

Where do you keep your plants during the coldest months of the year?

Share your experience with me, I’d like to hear from you!

Follow us on: