Mayapple is a rhizomatous native perennial of eastern North American woodlands that spreads to form broad, dense colonies of bold, parasol-shaped foliage. Sterile shoots carry a single leaf; flowering shoots fork into two and conceal a single white flower beneath the canopy in mid-spring. The plant goes summer-dormant by July, leaving bare ground in its wake.
It thrives in dappled light under deciduous canopy, capturing full spring sun before the overstory closes. Rhizomes spread steadily year over year; site it where colonizing is welcome, such as beneath oaks or along shaded slopes. A mulch of fallen leaves mimics its native habitat, retains moisture, and suppresses competing weeds. Colony spread can be managed by digging rhizome sections at the edges each fall.
The ripe yellow fruit is edible and has historically been used for jams and preserves, but must be fully ripe — all other plant parts are toxic. The rhizome contains podophyllotoxin, the chemical basis for the chemotherapy agents etoposide and teniposide and the active agent in topical wart treatments. Traditional Native American use included root preparations as a strong cathartic, though the margin between therapeutic and toxic dose is narrow.
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.
Rust
Orange to brown raised pustules on the undersides of leaves, with yellow spotting on the upper surface. Heavy infections cause leaves to yellow and drop.
Remove and destroy infected leaves. Avoid overhead watering and improve air circulation. Apply a sulfur or copper-based fungicide if it spreads. Clear plant debris in fall.
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.