Planting mitsuba successfully requires selecting a shaded or partially shaded location, as the plant naturally thrives away from harsh, direct midday sunlight found in forest understories. Prepare moist, rich, well-draining soil enriched with organic compost. Sow seeds lightly on the soil surface, pressing them gently without burying them deeply, as they require light to germinate effectively. Keep the soil consistently damp throughout the germination phase, and space mature plants a few inches apart to ensure healthy leaf development.