Peace lilies, scientifically known as Spathiphyllum, are popular houseplants admired for their elegant white spathes and vibrant green foliage. These plants are not true lilies but belong to the Araceae family, native to the tropical rainforests of Central and South America and parts of Southeast Asia. Their graceful appearance and air-purifying qualities make them a favored choice for indoor spaces.
Peace Lily Ideal Temperature Range
Peace lilies thrive in consistent, warm environments, replicating their natural tropical habitat. The optimal temperature range for these plants is between 65°F and 80°F (18°C to 27°C). Maintaining temperatures within this range supports their growth and overall health. Fluctuations outside this ideal zone can cause plant stress.
Temperatures below 55°F (13°C) for extended periods can cause stress and damage. While they can tolerate occasional dips to around 50°F (10°C), prolonged exposure to cooler conditions, especially below 45°F (7°C), can lead to irreversible harm. Consistent warmth ensures the peace lily’s metabolic processes function effectively, supporting lush foliage and potential blooms.
Recognizing Cold Stress
When a peace lily is exposed to low temperatures, it will exhibit visual symptoms of cold stress. A common sign is wilting or drooping leaves, which occurs because cold temperatures impair the plant’s ability to absorb and transport water, leading to dehydration. Leaves may also show color changes, turning yellow, brown, or developing white spots. In severe cases, areas of the leaves can become black, particularly along the edges, due to cellular damage.
Leaf curling is another sign, as the plant attempts to conserve heat. Blooms may also turn brown prematurely or drop off. Depending on the severity and duration of cold exposure, damage can range from minor discoloration on leaf tips to the complete browning and crispiness of entire leaves, signaling significant cellular death.
Preventing Cold Exposure
Protecting peace lilies from cold temperatures involves thoughtful placement and proactive measures. Keep these plants away from drafty windows and exterior doors, especially during colder months. Position peace lilies away from air conditioning vents, which emit cold drafts. If temperatures drop significantly, temporarily relocate the plant to a warmer, more central part of the home.
Move peace lilies indoors or to a sheltered spot if they are near less insulated areas. For brief cold snaps, insulate the pot or cover the plant with a cloth overnight. Monitor room temperature with a thermometer to ensure it remains within the peace lily’s preferred range.
Caring for Cold-Stressed Peace Lilies
If a peace lily has sustained cold damage, immediate action can aid recovery. First, move the plant to a consistently warmer location, ideally above 60°F (15°C), away from further cold exposure. Assess the damage; trim severely affected leaves (more than 50% damaged) at the base of the stem using clean, sharp shears. This redirects energy to new growth.
Proper watering is important during recovery. While peace lilies prefer consistently moist soil, avoid overwatering, as water uptake may be compromised, increasing root rot risk. Allow the top inch of soil to dry before watering with room temperature water to prevent further shock. Patience is essential for recovery. Avoid fertilizing immediately, as this can add further stress.