Centella asiatica aka Gotu Kola

Centella asiatica is a low-growing, creeping groundcover that typically reaches only 20cm (8 inches) in height. However, it spreads extensively through stolons (runners) that root at the nodes, creating dense mats up to 1 meter or more in spread. In favorable conditions with consistent moisture, a single plant can spread much further as the stolons can extend up to 250cm. Growth rate is moderate, though its spreading habit can make it appear faster-growing.

Centella asiatica is adaptable to various soil types including light (sandy), medium (loamy), and heavy (clay) soils. The key requirement is consistent moisture rather than specific soil composition. A mixture of peat moss, sand, and loamy soil provides ideal porosity and moisture retention. The plant prefers slightly acidic to neutral pH (5.5-7.0) and benefits from rich organic matter. Avoid compacted soils that prevent proper drainage, as this can cause root problems despite the plant's love of moisture.

Centella asiatica thrives in temperatures between 20-28°C (68-82°F) but can survive in a range of 5-30°C (41-86°F). It is hardy to USDA zones 7-10 and UK zone 8, tolerating brief cold snaps down to -5°C to -10°C in sheltered positions. The plant is frost tender and will die back in freezing conditions but may regrow from roots in milder winters. In colder regions, it can be overwintered indoors or treated as an annual.

Centella asiatica naturally grows in tropical and subtropical wetlands, so it appreciates moderate to high humidity. While it can adapt to average household humidity, it thrives with higher moisture levels in the air. Regular misting, a pebble tray with water, or placement near other plants can help increase humidity. Low humidity combined with insufficient watering will cause the leaves to become crispy and brown at the edges.

Feed Centella asiatica monthly with a balanced liquid fertilizer during the active growing season (spring and summer). Adding compost or well-rotted manure to the soil improves fertility and moisture retention. Avoid over-fertilizing as the plant naturally grows in nutrient-moderate environments. During fall and winter, reduce or stop fertilizing as growth slows. For plants grown for culinary or medicinal purposes, organic fertilizers are preferred.

Centella asiatica is easily propagated through division or stem cuttings. For division, separate sections of the plant that have rooted at the nodes along the stolons - each section should have roots attached. For stem cuttings, take a healthy stem with at least one node and place it in water or moist soil until roots develop. Seeds can also be sown in spring in a greenhouse. Division during the growing season (spring is ideal) produces the fastest results.

Centella asiatica produces tiny, inconspicuous flowers that are easily overlooked. The flowers are greenish-white to pinkish, less than 3mm across, and appear in small rounded clusters (umbels) held near ground level under the foliage. Blooming typically occurs from July through September in temperate climates, though the plant can flower year-round in tropical regions. The flowers are not ornamentally significant but will produce small seeds if pollinated.

Centella asiatica is primarily self-pollinating, as the plant is hermaphroditic (having both male and female parts) and self-fertile. Research indicates that while small insects can pollinate the flowers, ants appear to be the primary insect pollinators - making this plant somewhat unusual in the botanical world. The tiny flowers held close to the ground are well-suited for ant visitation. Seeds ripen from August to September following successful pollination.

Centella asiatica grows outdoors in USDA zones 7-10 (UK zone 8). It thrives as a groundcover in moist, shaded areas and is excellent for bog gardens, pond edges, or damp spots where other plants struggle. In colder regions (zone 6 and below), it can be grown as an annual or brought indoors for winter. The plant tolerates temperatures down to -5°C to -10°C briefly but is frost tender and will die back in prolonged freezing conditions. It may naturalize and spread aggressively in favorable climates.

In tropical climates, Centella asiatica grows year-round with consistent care. In temperate regions, it grows vigorously during warm, humid months (spring through fall) and slows or dies back in winter. Reduce watering and stop fertilizing in winter if growth slows. In monsoon climates, the plant may die back during the dry season. For overwintering indoors, provide bright indirect light, maintain moisture, and keep temperatures above 10°C. Fresh growth emerges from roots when warm conditions return.

Centella asiatica benefits from occasional trimming to control its spreading habit and encourage bushier growth. Remove any yellow or damaged leaves as they appear. If the plant becomes leggy or sparse, trim back the stolons to encourage denser growth. Regular harvesting of leaves for culinary or medicinal use naturally keeps the plant compact. In gardens, you may need to trim back spreading runners to prevent the plant from becoming invasive.

Repot Centella asiatica when roots begin to fill the container or when the plant starts to decline despite proper care. Spring is the ideal time for repotting. Choose a wide, shallow container rather than a deep one, as the plant has a spreading rather than deep-rooting habit. Use well-draining but moisture-retentive potting mix. This is also an excellent opportunity to divide the plant and create new plants from rooted sections.

Centella asiatica is generally resistant to major pest and disease problems. However, watch for slugs and snails which are attracted to the moist conditions the plant prefers. Fungal diseases can occur in poorly ventilated, overly wet conditions. Root rot may develop if soil is waterlogged without proper drainage. Spider mites may appear in dry indoor conditions. Maintain good air circulation and avoid overhead watering to prevent fungal issues.

Yellow leaves on Centella asiatica usually indicate underwatering or nutrient deficiency. This moisture-loving plant requires consistently moist soil - if the soil dries out, leaves will yellow and wilt. Check soil moisture and increase watering frequency. Yellowing can also indicate nutrient deficiency, particularly nitrogen; feed with a balanced fertilizer if the plant hasn't been fertilized recently. Old leaves naturally yellow and die back as new growth emerges.

Brown leaf tips or edges on Centella asiatica typically indicate low humidity or inconsistent watering. This tropical plant needs moist conditions both in the soil and air. Brown, crispy leaves suggest the plant is too dry. Brown mushy leaves may indicate overwatering or root rot - ensure the pot has drainage and roots aren't sitting in stagnant water. Scorched brown patches can result from too much direct sunlight, particularly harsh afternoon sun.

Drooping in Centella asiatica is almost always caused by underwatering. As a wetland plant that naturally grows in marshy conditions, it wilts quickly when soil dries out. Water thoroughly and the plant should recover within hours. Drooping can also occur from heat stress if the plant is in too much direct sun. Less commonly, severely overwatered plants with root rot may droop as damaged roots can't take up water - check for mushy, dark roots if watering seems adequate.

Slow growth in Centella asiatica is often caused by insufficient light, inadequate moisture, or cool temperatures. While the plant tolerates shade, too little light will slow growth significantly. Ensure soil stays consistently moist and humidity is adequate. Growth naturally slows in cool weather and during winter. Nutrient-poor soil or lack of fertilization during the growing season can also limit growth. Container-bound roots may restrict growth if the plant needs repotting.

Centella asiatica leaves are edible raw or cooked. Young leaves are preferred and can be added to salads, curries, soups, and stews. The flavor is aromatic with a slightly bitter taste that can be overpowering in large quantities. In Asian cuisines, it's used in drinks, juices, and tonic teas. The plant has an edibility rating of 2/5 from Plants For A Future - it's edible and nutritious but not a primary food source. As with any herb, consume in moderation.

Centella asiatica is one of the most valued medicinal herbs, receiving a 5/5 medicinal rating from PFAF. It serves as an adaptogen, nervine, and tonic herb in traditional medicine. Key uses include wound healing (speeds tissue repair and reduces scarring), cognitive support (memory and concentration), circulatory problems (especially in lower limbs), and skin conditions. Active compounds include asiaticoside and madecassoside. Caution: excess doses can cause headaches and temporary unconsciousness. Fresh plant material is preferred as dried herb loses potency quickly.

Beyond food and medicine, Centella asiatica extracts are used in cosmetic products to increase collagen production and firm skin. The plant works well for erosion control on slopes and wet areas due to its spreading, mat-forming habit. It can be grown as an ornamental groundcover in moist gardens, bog gardens, or around ponds. PFAF rates other uses as 1/5, indicating limited non-medicinal/non-edible applications.

Centella asiatica has a pantropical distribution, native to tropical and subtropical regions of Asia, Africa, Australia, and islands in the western Pacific Ocean. It is found throughout South and Southeast Asia (India, Sri Lanka, China, Japan, Indonesia), East Africa, West Africa, southern Africa, and extends to northeastern Australia. The plant grows naturally in wetlands, paddy fields, marshes, stream banks, and damp grasslands from sea level up to 3,480 meters elevation.

Gotu Kola presents a moderate level of care, which allows plant enthusiasts with some experience to expand their skills and knowledge.

Gotu Kola should be watered regularly, allowing the soil to dry out between waterings.

To ensure optimal growth, the Gotu Kola prefers bright diffused light for 6-8 hours each day. Insufficient light can result in slow growth and leaf drop, so it's important to find a well-lit location for this plant. Place it near a window, within a distance of 1 meter (3 feet), to enhance its potential for thriving.

Gotu Kola is not known to cause harm to humans or pets.