Coleus 'Henna' Care Sheet for Closed Terrariums
 
Overview: Coleus 'Henna' is a striking ornamental plant with vibrant foliage, making it an excellent choice for closed terrariums. Here's a care guide tailored specifically for growing Coleus 'Henna' in a closed terrarium environment.
 
Terrarium Setup:
Select a clear glass container with a tight-fitting lid to create a closed terrarium environment.
Provide a layer of drainage material such as gravel or activated charcoal at the bottom to prevent waterlogging.
Add a thin layer of sphagnum moss or a moisture-retaining substrate to promote humidity and moisture regulation.
 
Light:
Coleus 'Henna' thrives in bright, indirect light, making it suitable for placement near a window or under artificial grow lights.
Avoid exposing the terrarium to direct sunlight, as it can lead to leaf scorch or overheating inside the enclosed environment.
 
Watering:
Closed terrariums create a self-sustaining ecosystem where water recycles within the container.
Water sparingly, only when condensation levels drop significantly or the soil feels dry to the touch.
Be cautious not to overwater, as excessive moisture can lead to root rot and fungal issues within the enclosed environment.
 
Temperature:
Maintain a consistent temperature range between 65°F to 75°F (18°C to 24°C) within the terrarium.
Avoid exposing the terrarium to extreme temperature fluctuations, as it can stress the plant and disrupt the enclosed ecosystem.
 
Humidity:
Closed terrariums naturally create a humid environment ideal for Coleus 'Henna'.
Monitor humidity levels regularly and ensure they remain within the optimal range of 60% to 80%.
If humidity levels drop, mist the inside of the terrarium with water or place a small humidifier nearby to increase moisture levels.
 
Soil:
Use a well-draining, nutrient-rich potting mix suitable for tropical plants.
Ensure the soil is loose and airy to promote healthy root growth and prevent compaction within the enclosed environment.
 
Fertilization:
Coleus 'Henna' in closed terrariums typically requires minimal fertilization due to the recycling of nutrients within the ecosystem.
If necessary, apply a diluted, balanced liquid fertilizer sparingly during the growing season to supplement nutrient levels.
 
Pruning:
Regularly trim back any overgrown or leggy stems to maintain the desired size and shape of the plant within the terrarium.
Remove any yellowing or dead leaves to promote overall plant health and prevent decay in the enclosed environment.
 
Pests and Diseases:
Closed terrariums provide a protective barrier against most pests and diseases.
However, monitor the plant closely for signs of pest infestations or fungal issues, especially in areas with poor air circulation.
Treat any problems promptly with appropriate organic or chemical remedies to prevent them from spreading to other plants in the terrarium.
 
Additional Tips:
Rotate the terrarium occasionally to ensure uniform light exposure and prevent uneven growth.
Keep the terrarium clean by wiping down the glass walls periodically to remove dust and debris.
Enjoy the vibrant colors and unique foliage of Coleus 'Henna' as it thrives within the enclosed ecosystem of your closed terrarium, creating a captivating miniature garden display.