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Selaginella Siamensis Hieron, also known as a type of Spike Moss or Club Moss, is a tropical plant that thrives in conditions mimicking its native forest floor environment. It is often grown in terrariums or humidified rooms.

Here are the Selaginella Siamensis Hieron key care requirements:

💧 Humidity (The Most Important Factor)

High Humidity is Essential: Selaginella Siamensis Hieron plant needs high humidity to thrive, ideally 75% or higher. It can tolerate a minimum of around 60%, but you will need to mist regularly.
Best Environment: It is best suited for a closed terrarium, vivarium, or paludarium where humidity is easily maintained.
Boosting Humidity: If growing outside of a closed environment, use a humidifier placed nearby or set the pot on a pebble tray with a shallow layer of water (make sure the pot’s bottom is not submerged).

☀️ Light

Bright, Indirect Light: Selaginella Siamensis Hieron prefers bright, indirect light or partial shade.
Avoid Direct Sun: Never expose it to direct, strong sunlight, as this will quickly scorch and damage the delicate leaves.
Low Light Tolerance: It can tolerate lower light, but its vibrant coloring and growth may be reduced.

💦 Watering

Keep Soil Consistently Moist: The soil should be kept moist at all times and should never be allowed to fully dry out.
Avoid Soggy Soil: While it needs moisture, the soil must not be soggy or saturated to prevent root rot.
Watering Technique: Bottom watering (sitting the pot in an undertray of water for a short period) is recommended to ensure the roots are watered and to prevent overwatering.
Temperature: Use room temperature water, as cold water can shock the plant.

🪴 Soil & Potting

Soil Mix: Use a well-draining, yet moisture-retaining soil mix, such as a high-quality houseplant potting mix amended with perlite (for drainage) and vermiculite or peat moss (for moisture retention).
Potting: It likes to be slightly pot-bound. Only repot when the roots are clearly growing out of the drainage holes, typically increasing the pot size by one step.

🌡️ Temperature

Warm Temperatures: Keep the plant in average to warm household temperatures, ideally between $18-28^circtext{C}$ ( $65-82^circtext{F}$ ) during the day.
Avoid Drafts: Protect it from cold drafts, air conditioning, and heat vents, which can dry out the foliage.

✂️ Pruning and Fertilizing

Pruning: Prune any yellowing or dead growth to keep the plant tidy and promote a more bushy appearance.
Fertilizing: Fertilize sparingly during the growing season (spring/summer). Use a balanced liquid fertilizer diluted to half or quarter strength once a month.