Clearweed (Pilea microphylla) is a houseplant favored for its delicate foliage and ease of cultivation. It is also known as Artillery Plant or Angeloweed. Its small stature and fine texture make it an appealing choice for indoor settings.
Understanding Clearweed
Clearweed (Pilea microphylla) features minute, lime-green leaves, typically less than 1/2 inch, arranged on short, arching, translucent stems, creating a fine, fern-like appearance. Native to tropical and subtropical Central and South America, it thrives in warm, humid conditions, often spreading as a groundcover. The common name “Artillery Plant” comes from the male flowers’ ability to forcefully eject pollen into the air, a unique and harmless reproductive trait.
Clearweed Houseplant Care
Light
Clearweed thrives in bright, indirect light, mimicking its natural understory habitat. An east or north-facing window is ideal, providing ample light without direct, intense sun. Direct afternoon sunlight can scorch its leaves, causing browning or crispy edges. If natural light is insufficient, supplemental LED grow lights positioned 6-12 inches above for 12-14 hours daily can be beneficial.
Watering
Consistent soil moisture is important for Clearweed, but it is sensitive to overwatering. Water when the top inch of soil feels dry, allowing excess water to drain completely. Overwatering can cause root rot; prolonged dryness may lead to wilting or leaf drop. Adjust watering frequency seasonally, increasing it during spring and summer growing periods and reducing it in cooler months.
Soil and Potting
Clearweed grows best in a well-draining, fertile potting mix that retains some moisture. A peat-based mix or one designed for African violets works well, providing adequate drainage and moisture retention. Soil pH should be slightly acidic to neutral (6.0-7.0). Repot every 1-2 years or when the plant becomes root-bound, moving it to a pot only slightly larger to avoid excessive soil moisture.
Temperature and Humidity
Clearweed prefers average to warm temperatures (65-75°F / 18-24°C). It is sensitive to sudden temperature changes and cold drafts; avoid placing it near heating or air conditioning vents. Moderate to high humidity (50-70%) is appreciated. Increase humidity with a pebble tray, by grouping plants, or by misting foliage regularly.
Fertilizing
During its active growing season (spring and summer), Clearweed benefits from light fertilization. Use a balanced, water-soluble fertilizer diluted to half strength every 2-4 weeks. A 10-10-10 or 20-20-20 NPK ratio is suitable. Reduce or stop fertilizing during fall and winter when growth slows. Over-fertilization can cause brown or crispy leaf edges and salt buildup.
Propagating Clearweed
Propagating Clearweed is straightforward, primarily through stem cuttings. Select healthy, vigorous stems 2-4 inches long, ensuring each has at least 2-3 leaves. Remove leaves from the bottom inch or two to expose nodes. Cuttings can be rooted in water (roots typically form within weeks) or directly planted into a moist, well-draining potting mix. Maintain a warm, humid environment for cuttings, possibly by covering with a clear plastic bag or propagation dome, and keep soil consistently moist until roots develop.
Addressing Common Clearweed Issues
Clearweed can exhibit issues related to its environment or care. Leggy, sparse growth indicates insufficient light, suggesting a brighter location is needed. Yellowing leaves can signal overwatering or underwatering; check soil moisture and adjust watering practices. Leaf drop may occur due to environmental stress or improper watering. Common houseplant pests like spider mites and mealybugs can affect Clearweed; early detection and treatment with horticultural oil or insecticidal soap can manage infestations.
Why Grow Clearweed
Clearweed offers several advantages, making it a desirable houseplant. It is low-maintenance and adapts well to various indoor environments, suitable for both novice and experienced plant enthusiasts. Its unique, delicate appearance, with tiny lime-green leaves and translucent stems, adds a distinctive texture. Clearweed is also well-suited for terrariums due to its compact size and humidity preference. Additionally, Pilea microphylla is non-toxic to humans and pets, making it a safe choice for households with children or animals.