Frangipani, scientifically known as Plumeria, are tropical plants cherished for their vibrant, fragrant blossoms. Their successful cultivation hinges significantly on understanding specific temperature requirements. Optimal temperature conditions are fundamental for their overall health, robust growth, and prolific flowering. For gardeners cultivating frangipani outside their native tropical zones, mastering these thermal needs is crucial for the plants to thrive and produce flowers.
Ideal Growing Temperatures
Frangipani flourish in consistently warm conditions, ideally within a temperature range of 65°F to 80°F (18°C to 27°C). Maintaining temperatures within this spectrum encourages vigorous vegetative growth and supports the development of abundant flower stalks. Consistent warmth ensures efficient metabolic processes.
Temperatures that consistently fall below this optimal range can significantly impede the plant’s growth rate. When too cool, frangipani may exhibit stunted development and reduced flowering. Conversely, prolonged exposure to temperatures significantly above 80°F (27°C) can also induce stress, particularly if accompanied by insufficient moisture.
Cold Tolerance and Protection
Frangipani are highly susceptible to cold temperatures, especially those falling below 50°F (10°C). Freezing temperatures, even brief, can cause severe damage or be fatal. Signs of cold stress include blackening of the stems, shriveled or discolored leaves, and a general decline in plant vigor.
For potted frangipani, relocating them indoors to a warmer environment is an effective protective measure when cold weather is anticipated. In-ground plants in marginal climates benefit from frost cloths or blankets draped over them before a freeze, providing a layer of insulation. Choosing a sheltered planting location, such as near a south-facing wall, can also offer natural protection from cold winds and lower overnight temperatures.
Heat Tolerance and Management
Frangipani tolerate high temperatures, a characteristic of their tropical origins. However, extreme heat, particularly when sustained above 95°F (35°C), can still lead to stress, especially if humidity levels are low or water availability is insufficient. Symptoms of heat stress might include wilting of leaves during the hottest part of the day or the development of leaf scorch, where leaf edges turn brown and crispy.
To mitigate heat stress, ensure frangipani receive adequate and consistent watering, especially during prolonged hot spells. For plants in intensely hot climates, providing partial afternoon shade can reduce the direct sun exposure during the most scorching hours, preventing desiccation and protecting foliage from sunburn.
Temperature and Dormancy
Cooler temperatures and shorter daylight hours typically trigger a natural dormancy cycle in frangipani, usually when temperatures consistently drop below 50-55°F (10-13°C). During this period, the plant sheds its leaves and ceases active growth. This dormancy is a survival mechanism, allowing the plant to conserve energy and protect itself from the adverse conditions of cooler seasons.
During dormancy, the care routine for frangipani changes significantly; watering should be drastically reduced or even stopped entirely to prevent root rot. Protecting the dormant plant from frost is also important. This leafless state is a normal part of the frangipani’s life cycle, allowing the plant to re-emerge vigorously when warmer conditions return.