What is the ideal nighttime temperature range for interior plants?

• A. 60-70 F
• B. 70-80 F
• C. 50-60 F
• D. 40-50 F

Answer: (A)

Interior plants thrive when nighttime temperatures stay moderate and steady, avoiding extremes. The best range for most interior tropicals is about 60–70°F at night. This cool enough level helps slow growth to a healthy pace and minimizes water loss, while staying warm enough to prevent chilling injury to sensitive tropical tissues. Temperatures in the 70–80°F range at night are warmer than ideal for many species and can stress plants if humidity isn’t high enough. On the other hand, dipping into the 50s or 40s can damage or stress tropical leaves and roots. So, keeping nighttime conditions around 60–70°F provides a safe, comfortable environment for interior plants.