Root balls: 3 inches (8 cm). Start of spring or the beginning of autumn. Spacing 6 to 18 inches (15 to 45 cm).
Seeds: Surface 1/8 inch (3 mm). Germination time: one month to 1 ½ years. Seed: Method 1: Seeds should first be sown into peat pots in the autumn. Next sink the pots into the ground in an area that offers shade, preferably close to a wall that faces north. Provide a glass/plastic covering. Keep an eye on them to ensure that the soil remains moist. Bring the peat pots indoor at the beginning of spring and keep at 60 to 65°F (16 to 18°C). Transplant seedlings when they are 12 months old in either spring or autumn. Seed: Method 2: In the spring; sow into peat pots as above, wrap in a plastic bag, then stratify by refrigeration for three weeks. Next bury the pots as described above. Once seedlings emerge transplant them to their final location.
Requirements and care: Dappled shade, winter sun ok. Good drainage. Soil pH 6.0 to 7.5. Humus. Moist soil. Regular watering. Light feed two times per annum. Tidy dead leaves and flowers in autumn. Propagate: by dividing the root ball following flowering.