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Fertilising guide

How to fertilise Masterwort 'Ruby Wedding' (Astrantia major)— schedule & NPK

Also called Ruby Wedding Masterwort, Great Masterwort, Hattie's Pincushion.

More about masterwort 'ruby wedding'

About Masterwort 'Ruby Wedding'

Astrantia major · also called Ruby Wedding Masterwort, Great Masterwort · flowering

Masterwort 'Ruby Wedding' is a clump-forming herbaceous perennial with distinctive pincushion flower heads of deep ruby-red surrounded by papery bracts. It blooms from late spring through summer and thrives in partially shaded, moist borders. A cottage-garden classic with a long flowering season. Not considered toxic to pets.

Growth habit: Clump-forming herbaceous perennial

What fertiliser masterwort 'ruby wedding' actually wants — and why

Masterwort 'Ruby Wedding' flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for masterwort 'ruby wedding': match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed masterwort 'ruby wedding', and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For masterwort 'ruby wedding':

Apply a balanced slow-release fertiliser in spring as growth resumes. Avoid over-feeding with nitrogen, which promotes leafy growth at the expense of flowers. A light top-dressing of garden compost each spring is often sufficient. In practice: no routine feeding at all for masterwort 'ruby wedding' — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

The dormant-season rule matters more than the exact interval: skip feeding entirely when masterwort 'ruby wedding' is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for masterwort 'ruby wedding'

None is the correct answer for masterwort 'ruby wedding'. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

Feeding always goes onto already-damp soil, never dry roots — water masterwort 'ruby wedding' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the masterwort 'ruby wedding' watering schedule.

Signs you are over-feeding masterwort 'ruby wedding'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for masterwort 'ruby wedding':

Signs you are under-feeding masterwort 'ruby wedding'

If the symptoms point at watering, light or roots rather than nutrition, the full masterwort 'ruby wedding' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If masterwort 'ruby wedding' has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

Organic vs synthetic feeds for masterwort 'ruby wedding'

Organic options

A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.

Synthetic / liquid feeds

None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in masterwort 'ruby wedding'.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising masterwort 'ruby wedding' — frequently asked questions

What fertiliser does masterwort 'ruby wedding' need?

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Masterwort 'Ruby Wedding' flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

How often should I feed masterwort 'ruby wedding'?

Apply a balanced slow-release fertiliser in spring as growth resumes. Avoid over-feeding with nitrogen, which promotes leafy growth at the expense of flowers. A light top-dressing of garden compost each spring is often sufficient. Apply a balanced slow-release fertiliser in spring as growth resumes. Avoid over-feeding with nitrogen, which promotes leafy growth at the expense of flowers. A light top-dressing of garden compost each spring is often sufficient. In practice: no routine feeding at all for masterwort 'ruby wedding' — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for masterwort 'ruby wedding'?

None is the correct answer for masterwort 'ruby wedding'. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

What does over-feeding masterwort 'ruby wedding' look like?

Abundant leafy growth and very few flowers (the classic over-rich symptom). Soft, floppy stems and a sprawling, leafy habit. Scorched edges and salt crust if it has been fed in a container. Feeding masterwort 'ruby wedding' at all — especially "to help it flower" — is the defining mistake. Rich soil gives you a big green plant and almost no blooms; restraint is what produces the flowers.

Should I flush the soil of masterwort 'ruby wedding'?

If masterwort 'ruby wedding' has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

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