Masterwort
Astrantia major
An ornamental plant, planted March to May, or sown March to May.
In September: cut back the masterwort.
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Masterwort, month by month
Bar: the usual months. Sprout: this month.
| Sowing, planting or job | Sep | Oct | Nov | Dec | 2027Jan | Feb | Mar | Apr | May | Jun | Jul | Aug |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow under cover. | none | none | none | none | none | none | usual | usual | usual | none | none | none |
| Plant a bare-root masterwort. | none | none | none | none | none | none | usual | usual | usual | none | none | none |
| Cut back the masterwort. | usual | usual | usual | none | none | none | usual | usual | usual | none | none | none |
| Lift and divide the masterwort. | none | none | none | none | none | none | usual | usual | usual | none | none | none |
| Deadhead the masterwort. | none | none | none | none | none | none | none | none | none | usual | usual | none |
What to do, and when
The usual months for a UK garden. Your own plan gives the week.
Sowing and planting
Sow under cover March to May, on the surface. Moderate source: Gardeners’ World. Weaker source for the depth: Seeds to Sow.
Plant a bare-root masterwort March to May, 15 to 20cm apart. Moderate source: Farmer Gracy.
Cut back the masterwort
Cut the stems down to 3cm above soil level.
Usually March to May, and September to November. Moderate sources: Gardeners’ World and Farmer Gracy.
Lift and divide the masterwort
Usually March to May. Strong source: RHS.
Deadhead the masterwort
Usually June to July. Moderate source: Beth Chatto.
What the source words mean
Strong: the RHS page for this plant is among them.Moderate: another trusted UK source, or the RHS on its group.Weaker: a blog, a forum, a small website or a page from outside the UK. Treat it as a guide.
Every line above names the page it comes from. Where we found no good source for a job, we left it out. Where the name “Masterwort” comes from.