As a Bird of Paradise plant (*Strelitzia reginae* and *Strelitzia nicolai*), my ideal temperature range is a reflection of my origins in the subtropical coastal regions of South Africa. I thrive in conditions that mimic the warm, sunny days and relatively cooler nights of my native habitat. To ensure I grow vigorously and produce my magnificent, crane-like flowers, maintaining the correct temperature is paramount.
My preferred temperature range for active growth and development is between 65°F and 85°F (18°C to 29°C). Within this bracket, my metabolic processes, including photosynthesis, respiration, and nutrient uptake, function at their peak efficiency. This allows me to produce the large, sturdy, banana-like leaves I am known for and, most importantly, channel enough energy to develop my complex flower structures. Consistency within this range is greatly appreciated, as it prevents me from expending extra energy on stress responses.
I can tolerate temperatures above 85°F (29°C), even into the 90s°F (32-35°C), but this is not without consequence. In such heat, my rate of transpiration increases dramatically to cool my tissues, which can lead to rapid moisture loss from my soil and leaves. Without a significant increase in water availability and atmospheric humidity, my leaf edges may begin to brown and crisp, a condition known as leaf scorch. Furthermore, prolonged exposure to extreme heat can halt flower development and cause my existing blooms to wilt prematurely.
I am far more sensitive to cold than to heat. While I can withstand a brief dip to around 50°F (10°C), sustained exposure to temperatures below this point is dangerous. When the thermometer reads between 32°F and 50°F (0°C to 10°C), my growth will completely stall. More critically, cell damage begins to occur. This manifests as blackening or dark, soggy spots on my leaves and stems. A hard freeze, meaning temperatures at or below 32°F (0°C), is often fatal, as it causes the water within my cells to freeze and rupture the cell walls, leading to irreversible damage and plant death.
A slight drop in temperature at night, by about 10-15°F (5-8°C) from the daytime high, is actually beneficial and mirrors my natural environment. This cooler period allows me to slow my respiration rate and conserve energy. For flowering specimens, this diurnal temperature variation is a crucial environmental cue that can help trigger and support the blooming cycle, encouraging the production of my iconic flowers.
It is important to understand that I am not a static organism. I can acclimate to some degree to seasonal shifts, particularly if they are gradual. A sudden shock, such as being moved from a warm indoors to a cold patio in early spring, will cause severe stress. Conversely, when winter arrives, I require protection. For gardeners in climates that experience frost, I must be grown in containers and brought indoors to a bright, cool location where temperatures are maintained safely above 50°F (10°C) to ensure I survive to see the next growing season.
