The Anthurium plant, recognized as the Flamingo Flower or Laceleaf, is a popular houseplant that brings a tropical aesthetic indoors. Originating from the warm, humid rainforests of Central and South America, this plant is accustomed to stable environmental conditions. Its survival and ability to produce colorful spathes depend on consistent warmth that mimics its native habitat. Maintaining a narrow range of temperatures is paramount for the plant’s long-term health and successful flowering.
Optimal Growing Temperatures
Anthuriums thrive when kept within a temperature band that promotes healthy metabolic function and robust growth. For optimal daytime warmth, the ideal range is between 68°F and 85°F (20°C to 29°C). This temperature supports efficient photosynthesis, allowing the plant to convert light energy into the sugars needed for development. Maintaining this warmth is directly linked to the plant’s vigor and its tendency to produce new leaves and flowers.
Nighttime temperatures should be slightly cooler than the daytime average to facilitate a natural physiological process. An ideal range for the nighttime drop is between 64°F and 75°F (18°C to 24°C). This temperature differential allows the plant to efficiently respire, using stored sugars to fuel growth without losing too much moisture. A stable, slightly cooler, night environment ensures the plant uses its energy reserves effectively for growth and bloom development.
Symptoms and Protection Against Cold Damage
Temperatures below the optimal range quickly cause significant stress and physical harm to this tropical species. The danger zone for the Anthurium begins when temperatures consistently drop below 60°F (15.5°C), causing growth to slow dramatically. Prolonged exposure below 50°F (10°C) often results in severe, lasting damage, as the minimum survival temperature is well above freezing.
Cold stress manifests visually through specific changes in the plant’s tissue. Foliage begins to wilt and droop, while leaves and stems may develop browning or blackening as the internal cells collapse. Immediate protection involves moving the plant away from cold window glass, which radiates chill, and shielding it from sudden cold drafts. If the plant experiences a cold snap, using lukewarm water when watering helps avoid shocking the root system while it recovers.
Managing High Heat and Thermal Stress
While Anthuriums prefer warmth, excessive heat is detrimental to their health and appearance. Temperatures consistently exceeding 90°F (32°C) induce thermal stress, causing biological processes to become less efficient. At these high temperatures, the rate of water evaporation from the leaves increases rapidly, and the plant’s capacity for photosynthesis decreases.
Heat stress symptoms include the edges of the foliage becoming crisp and brown, leaves curling, and the overall plant wilting as it struggles to retain moisture. For optimal flower quality, prolonged average daily temperatures above 80°F (26-27°C) should be avoided, as this can lead to abnormal development of flower buds. Mitigating high heat requires ensuring sufficient air circulation around the plant, which assists in cooling the leaves. Increasing humidity also helps cool the plant through evaporative cooling, and it is advisable to move the plant away from direct afternoon sun exposure during summer.