Depressed Clearweed (Pilea microphylla) is a delicate, low-growing plant suitable for indoor spaces, terrariums, or as outdoor groundcover in warmer climates. Its small, delicate leaves and mat-forming habit make it an appealing choice for plant enthusiasts.
What is Depressed Clearweed?
Pilea microphylla, also known as Artillery Plant or Rockweed, is a small herbaceous plant in the Urticaceae family. It features tiny, bright green, succulent-like leaves, typically under a quarter-inch, on delicate, branching stems. This mat-forming plant grows 6 to 12 inches tall and spreads widely. Native to tropical and subtropical Americas, it thrives in moist, shaded environments, often on rocks or in crevices.
A remarkable feature of Pilea microphylla is its unique method of pollen dispersal, which earned it the “Artillery Plant” nickname. When its male flowers mature, they explosively eject pollen into the air, sometimes propelling it up to 20 inches away. This fascinating mechanism, triggered by changes in humidity or even a gentle touch, serves as an efficient reproductive strategy in its natural habitat.
Essential Care Practices
Light Needs
Depressed Clearweed thrives in bright, indirect light, ideally near a north or east-facing window. Direct sun can scorch its delicate leaves, causing browning or crispy edges. Insufficient light leads to leggy growth, with elongated stems and pale, yellowing leaves.
Watering Schedule
Maintain consistent soil moisture, but avoid overwatering. Water when the top inch of soil feels dry, ensuring excess water drains to prevent root rot. During the spring and summer growing season, water more frequently (e.g., two to three times weekly). Reduce watering in fall and winter as growth slows.
Soil Requirements
Depressed Clearweed thrives in well-draining, loose, fertile soil rich in organic matter. An ideal potting mix consists of equal parts peat moss, perlite, and standard potting soil, ensuring good drainage and moisture retention. Keep the soil airy to support healthy root development and prevent compaction. Adding compost can enhance soil structure and nutrient availability.
Temperature and Humidity
Depressed Clearweed prefers warm, consistent temperatures, ideally 60°F to 80°F (15°C to 27°C). It is sensitive to cold drafts and sudden fluctuations. The plant also prefers moderate to high humidity (50-70%). To increase humidity, use a pebble tray, group plants, or use a humidifier. Regular misting also helps in dry indoor environments.
Fertilization
During spring and summer, fertilize Pilea microphylla regularly. Apply a balanced liquid fertilizer (e.g., 10-10-10 or 20-20-20 NPK) diluted to half strength every two to four weeks. Reduce or stop fertilization in fall and winter as growth slows. If using mineral-rich tap water, occasionally flush the soil with distilled water to prevent salt buildup.
Troubleshooting and Maintenance
Common issues with Depressed Clearweed stem from improper care. Yellowing leaves indicate overwatering or nutrient deficiency, requiring watering adjustments or fertilizer. Crispy or browning leaf edges suggest low humidity, underwatering, or excessive direct sunlight. Leggy growth, with stretched, sparse stems, indicates insufficient light; relocate the plant to a brighter spot.
Depressed Clearweed can encounter pests like spider mites, mealybugs, and fungus gnats. Spider mites are identified by fine webbing, while mealybugs are white, cottony masses. Treat by increasing humidity for spider mites, or using insecticidal soap or neem oil for various pests. Maintenance includes pruning to shape, encourage bushiness, or remove dead growth. Repot every one to two years, or when root-bound, ideally in spring, for fresh soil and root space.