Astrantia 'Superstar'
Greater masterwort
Also known as Astrantia major 'White Giant', Astrantia major 'Superstar'
- Height × spread
- 0.8m × 0.6m
- Position
- Full sun
- Hardiness
- Colder than -20C (RHS H7)
- Flowers
- Summer, Autumn
Availability
Please ask in store about availability
Many plants are seasonal. Call 01234 567890 to check current stock.
About this plant
A rather hearty plant that carries upright branching flowering stems that stand above the foliage mound of green lobed leaves. The flowers are held in clusters. They are coloured a slightly green-flushed shade of white with a neat ring of bracts that sit beneath the central flower (an umbel). This is composed of many individual small flowers, each carried on a threadlike pink stalk. Handsome when well grown, this should flower during June and July. Note: Once the first flush is over the plant can be cut back hard to the ground. It should be fed and well-watered whilst it regenerates to deliver a further show in September.
- Flower colour
- Green, White
- Foliage colour
- Green
- Variegated
- No
- Scent
- No
- Shape
- Fan
- Height
- 0.8m
- Spread
- 0.6m
- Season of interest
- Summer, Autumn
- Flowers in
- Summer, Autumn
- Evergreen
- Deciduous
- Garden style
- Wild flower meadow, Prairie garden
- Sun or shade
- Likes full sun, likes part shade, tolerates light shade
- Soil type
- Loam (normal)
- Soil pH
- All types
- Drainage
- Moisture retentive soil
- Hardiness
- Colder than -20C (RHS H7)
- Borders & containers
- Borders
- Use for
- Ground cover, Bee attraction
- Maintenance
- Easycare – low/no maintenance
- Hazards
- No
Spring
Spring - late · Outdoors
Feed with slow release fertiliser
Apply a general purpose slow release fertiliser, spreading it around the root area of the plant as it is coming into growth. (Or apply a liquid feed at regular intervals throughout the growing season.)
This is a simple way to provide a nutrient boost as a single annual procedure.
Spring-Autumn · Outdoors
Water to keep the soil moist
For best results, this plant needs soil that is always moist. Water deeply and regularly as soon as soil appears dry. Even for established plants in the ground, a dry week can cause problems with some soils. Check plants in pots more often, especially in hot weather. Or install an automatic irrigation system which will do the hard work for you, even when you are away on holiday.
Without regular watering some plants never fully regain their beauty.
Spring - early-mid · Planting
Divide when too large
The plant can be divided if it becomes too large or another plant is required. This may involve physically dividing the clump in two, removing offsets or small bulbs or dividing rhizomes. The new plants can be grown in pots or planted in the ground.
Summer
Summer - mid · Outdoors
Feed after cutting back
If the plant is cut back to the ground after flowering. Give a general purpose feed at this time to encourage new growth to develop.
Summer-Autumn · Planting
Prune young growth after flowering
When the plant has finished flowering, remove the flower and most of the young growth that the plant has made. Leave just around 2 centimetres of young growth on the plant. Don't cut into old wood unless it is diseased or damaged.
Planting & general
Planting
Deadhead blooms during flowering season
Remove flowers as they turn brown and fade. Snip the stem just below the bloom. This will keep the plant tidy and encourage more flowers.
The removal of spent flowers encourages the plant to produce fresh ones, rather than spend its energy on the development of seeds.
Found in
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