- Position: full sun or partial shade
- Soil: fertile, moist, preferably humus-rich soil
- Rate of growth: average to fast-growing
- Flowering period: June to August
- Hardiness: fully hardy
Exceptionally long, green-tipped, white bracts that are often incurved in the middle and raggedly toothed towards the ends, surround umbels of greenish white flowers, creating larger than average flower heads. In ideal conditions this masterwort will self seed freely if the faded flowers are not removed, but the resulting seedlings rarely come true to type.
- Garden care: Incorporate plenty of organic matter when planting and water well in dry weather especially newly established plants. Lift and divide large clumps in early spring and apply a generous 5-7 cm mulch of well-rotted manure or garden compost around the plant. Divided specimens may take some time to establish since they don't like having their roots disturbed.