This is a process in which water seeps out at the tips or edges of a plant’s leaves. The water is from xylem — the main water transport tissue in a plant. Usually, extra water escapes through tiny holes in the plant’s leaves and stem called stomata. But sometimes, those stomata are closed. When that happens, the pressure from water entering the roots continues to force water up through the plant. The water — and nutrients it picks up on the way — forces its way out as droplets at the tips and edges of leaves.