What is the ideal nighttime temperature range for interior plants?

The ideal nighttime temperature range for interior plants typically falls between 60-70°F. Option C indicates a range of 50-60°F, which is slightly lower than the optimal range, but for many houseplants, especially those that are not exceptionally heat-loving, this range can still be acceptable.

Cooler nighttime temperatures can help mimic natural environmental conditions, where temperatures often drop at night. This is beneficial for plant processes such as respiration and encourages healthier growth patterns. In addition, many interior plants can tolerate or even thrive in temperatures on the lower end of the spectrum, as long as they are not exposed to extremes that can cause stress or damage.

Higher temperatures, such as those indicated in the choices suggesting 70-80°F, can lead to stress for plants that prefer cooler conditions at night. Similarly, temperatures that drop to 40-50°F could be too cold for most common houseplants, risking damage or slowing down their metabolism significantly.