Pothos, often called Devil’s Ivy, is a popular houseplant known for its trailing vines and attractive foliage. While adaptable indoors, understanding its thermal requirements is important for outdoor placement. Pothos has distinct temperature preferences critical for its well-being and vigorous outdoor growth. Knowing these needs helps cultivate a thriving plant outdoors.
Optimal Outdoor Temperature Range for Pothos
Pothos, native to tropical Southeast Asia, thrives in warm, humid conditions. The ideal outdoor temperature range is 65°F to 85°F (18°C to 29°C). This range mimics its natural habitat, promoting robust growth, efficient photosynthesis, and healthy leaf development. While pothos can tolerate slight deviations, prolonged exposure outside this ideal window can hinder its development.
Protecting Pothos from Cold Temperatures
Signs of Cold Stress
Cold temperatures pose a significant threat to pothos, a tropical plant. When temperatures consistently drop below 50°F (10°C), pothos can suffer chilling injury; at freezing (32°F / 0°C) or below, frost damage is a severe risk. Signs of cold stress include yellowing or brown spots on leaves, often starting at the edges. Prolonged cold exposure can also cause leaves to wilt, droop, or blacken, indicating cell breakdown.
Preventing Cold Damage
To prevent such damage, bring pothos indoors when overnight temperatures are consistently below 50°F (10°C). During cold snaps, container-grown pothos can be temporarily moved to a sheltered location like a garage or covered patio. For in-ground plants in warmer zones, covering them with a frost cloth can offer some protection against brief temperature dips. If cold damage occurs, prune away any blackened or mushy leaves and stems to prevent further spread of rot, and move the plant to a warmer, stable environment.
Managing Pothos in Hot Temperatures
Signs of Heat Stress
High temperatures also challenge outdoor pothos, especially with direct sun exposure. When temperatures consistently rise above 90°F (32°C), pothos can experience heat stress. This stress manifests as wilting leaves, which curl inward or droop. Scorched patches, yellowing, or browning of leaves, especially at the tips, can also indicate heat damage. Intense, direct sunlight can exacerbate heat issues, leading to leaf burn and fading of the plant’s vibrant color.
Mitigating Heat Stress
To mitigate heat stress, position outdoor pothos in bright, indirect light or dappled shade, particularly during the hottest parts of the day. Increasing watering frequency is also crucial, as moisture evaporates quickly in hot conditions, but always ensure the soil drains well to prevent root rot. Good air circulation helps dissipate heat and can be improved by strategic placement or pruning.
Seasonal Transition and Outdoor Care Tips
Acclimatizing Pothos
Transitioning pothos outdoors in spring and indoors in fall requires a gradual approach to prevent shock. In spring, wait until overnight temperatures are consistently above 50°F (10°C) before moving plants outside. Begin by placing them in a sheltered, shaded spot for a few days, gradually increasing their exposure to brighter, indirect light over a week or two. This acclimatization prepares the plant for the outdoor environment.
Ongoing Outdoor Care
Adjust watering schedules seasonally based on temperature and humidity levels. Pothos will require more frequent watering during hot, dry summer periods, sometimes daily for container plants, but always check the top few inches of soil for dryness before watering. Conversely, reduce watering in cooler, more humid conditions or as fall approaches. Regularly inspect outdoor pothos for pests; early detection and treatment are important for plant health.