Chanca piedra is a small tropical annual or short-lived perennial in the family Phyllanthaceae, native to coastal lowlands and disturbed ground across South and Central America, India, and Southeast Asia. Its common name translates as 'stone breaker' in Spanish, reflecting its primary ethnobotanical role. Plants reach 12–24 inches tall with fine alternate leaves and inconspicuous flowers arranged along the undersides of slender stems.
In zones 10–12 it self-seeds prolifically and behaves as a persistent volunteer in warm, frost-free gardens. It tolerates part shade and adapts to a range of well-drained soils, performing best in loose, loamy ground at a slightly acidic to neutral pH. Mulching helps retain moisture during dry seasons and suppresses competing weeds around the plant's shallow roots. In cooler zones it must be started indoors and grown as a warm-season annual.
Chanca piedra is documented in Ayurvedic, South American, and South Asian traditional medicine systems for urinary tract conditions and liver support. Laboratory and limited clinical research has identified the compounds phyllanthin and hypophyllanthin with hepatoprotective and antilithic activity. Some human trials have examined its effects on calcium oxalate kidney stone passage and on hepatitis B surface antigen levels.
Damping Off
Seedlings collapse at the soil line with thin, water-soaked stems; seeds may fail to emerge or rot before sprouting.
Sow in well-draining mix, avoid overwatering, and ensure good airflow. Remove affected seedlings and let the surface dry between waterings.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.