Common name: Masterwort
Astrantia is a hardy herbaceous clump forming perennial suited to sun and shade.
It is a good subject for that wild garden look, particularly in a partially shaded area where the soil remains quite moist in summer.
The clusters of purple-red or white flowers that appear in July grow to about 300-500mm (12”-18”) high with a similar spread.
The flowers are also useful in a cut flower arrangement.
In an exposed position the plants may need supporting with twiggy sticks.
Normally seeds are sown in summer / autumn of the previous year in a cold frame, however if this was not possible you can make a sowing in a frost free greenhouse at around 10°C (50°F) and hopefully make up for lost time.
Once germinated ensure that the seedlings get the maximum light available to avoid soft leggy growth.
Prick out the seedlings sown the previous year into 70mm (3”) pots and grow on in a coldframe until planting out time.
Week 26 - 30:
Sow seeds in seed compost and place in a cold frame to germinate.
Subject to ambient temperatures they may take 1-2 months to germinate.
Cut down the stems after flowering.
Now is also a suitable time to divide and replant established plants.
Plant out potted seedlings between now and March in any ordinary garden soil at 200-300mm (8”-12”) centers.