The Fukien Tea Bonsai (Carmona microphylla) is a favored indoor bonsai species, recognized for its glossy green leaves, delicate white flowers, and intricate trunk. Originating from tropical and subtropical regions of Southern China and Southeast Asia, this evergreen plant thrives in warm, stable conditions. Maintaining consistent environmental parameters, particularly temperature, is highly important for its health and continued vibrancy.
Ideal Temperature Range
Fukien Tea Bonsai flourish within a temperature range of 60°F to 80°F (15°C to 27°C). Some sources suggest an optimal range between 60°F and 85°F (15°C and 30°C). While they can tolerate some fluctuations, consistency within this range is beneficial for the plant’s metabolic processes and overall well-being.
Sudden temperature shifts can cause stress to the plant, leading to leaf drop. Maintaining a constant temperature, ideally between 60°F and 75°F (15°C and 24°C), supports continuous growth and flowering. This stability mimics their natural habitat, preventing energy expenditure on adaptation.
Protecting from Cold
Temperatures falling below 60°F (15°C) can negatively impact a Fukien Tea Bonsai, with prolonged exposure to cold or frost being particularly damaging. Temperatures below 59°F (15°C) can lead to root problems and eventual leaf loss. Signs of cold stress include leaf drop, yellowing, shriveling, and stunted growth.
To protect the bonsai, it is advisable to bring it indoors if outdoor temperatures consistently drop below 60°F (15°C). Position the plant away from cold drafts from windows or doors. Using a heating mat can provide additional warmth, especially if the ambient room temperature is consistently cool. For those in colder climates, ensuring a consistent indoor temperature above 60°F (15°C) is important.
Protecting from Heat
Excessive heat can pose challenges for the Fukien Tea Bonsai, leading to stress and accelerated drying of the soil. Prolonged direct, intense sunlight, especially during the hottest parts of the day, can scorch leaves. High temperatures increase the plant’s water demand, making it more susceptible to drying out quickly.
To mitigate heat stress, ensure good air circulation. Provide partial shade during the peak heat of the day to prevent leaf burn. Misting the foliage can help increase local humidity and cool the plant, although it is not a substitute for proper watering. Consistent monitoring of soil moisture is important, as heat causes water to evaporate more rapidly.
Recognizing Temperature Stress
Signs of temperature-related stress in a Fukien Tea Bonsai include specific visual cues. Both cold and heat stress can manifest as wilting or drooping leaves, indicating the plant is struggling to manage its water balance. Leaf discoloration, such as yellowing, is another common symptom, which can occur from either extreme.
Leaf drop is a frequent response to sudden temperature changes or prolonged unsuitable conditions. Stunted growth or a lack of new shoots may also signal that the plant is under temperature pressure. While these symptoms can sometimes point to other issues, temperature should be a primary consideration if other care parameters are being met.