When to Bring Tropical Plants Indoors: Temperature Guidelines

Tropical plants require specific temperature conditions to thrive, and the transition from outdoor to indoor environments can be sensitive. This article discusses the appropriate times to bring tropical plants indoors based on temperature, with a focus on Jackfruit seedlings in a subtropical region.

Understanding Tropical Plant Temperature Requirements

Tropical regions exhibit a wide range of environmental conditions, making it essential to understand the specific requirements of each plant. Different types of tropical plants can thrive in varying temperature ranges. For instance, plants from lowland riverbanks and coasts generally have lower temperature tolerances compared to those from mountainous regions.

Temperature Tolerance by Region

Truly tropical areas, such as those in USDA Zone 10b, typically experience milder winters but still require protection when temperatures approach or fall below freezing. In my experience, living in a semi-tropical/temperate climate in a USDA Zone 10b in Australia, Jackfruit seedlings are particularly sensitive. A slight frost, even around 0°C (32°F), can be fatal to these delicate plants. Therefore, it is crucial to monitor temperature fluctuations and take appropriate measures to protect them.

My Personal Experience with Jackfruit Seedlings

At about 10°C (50°F) in my climate, Jackfruit seedlings are usually kept indoors until they become robust enough to survive outdoor conditions. However, the weather can be unpredictable, as shown by a recent forecast predicting a 14°C (57°F) temperature with a nighttime drop to 6°C (43°F). Such a drastic temperature change can be detrimental to the plants, especially considering their tender stems that are only 1/8″ (3 millimeters) thick. These stems are even more susceptible to damage during excessive rain, leading to conditions like brown spot disease which can be fatal for the plant.

Timing the Transition

I recommend waiting until the trunks of Jackfruit seedlings have grown to at least 3/8″ (10 millimeters) or preferably 1/2″ (13 millimeters) thick before planting them outdoors. This ensures the plant has sufficient structural integrity to withstand outdoor conditions. Currently, the Jackfruit seedlings are in indirect sunlight, which mimics their natural habitat in a rainforest canopy, providing a protective microclimate.

General Guidelines for Bringing Plants Indoors

For tropical plants generally, it is advisable to bring them indoors if the temperature drops to below freezing. Cold blasts, even without a complete freeze, can be more harmful than the temperature change itself. Therefore, if temperatures are forecasted to dip below 10°C (50°F), it is wise to take the plants indoors.

Culture-Specific Considerations

It is important to note that Jackfruit plants are particularly sensitive due to their origin in tropical lowland regions. Other tropical plants like bananas, pineapples, and larger papaya plants can tolerate lower temperatures better, but they are still not frost or snow tolerant. Thus, they should be protected from severe cold.

Conclusion

Properly timing the transition of tropical plants between indoor and outdoor environments is key to their health and survival. By understanding and respecting the specific temperature requirements of your plants, you can ensure they thrive throughout the year. Regular monitoring of weather forecasts and immediate action when necessary will help safeguard your tropical plants during extreme temperature changes.

Keywords: tropical plants, night time temperature, indoor horticulture