Fertilising guide

How to fertilise London Pride (Saxifraga umbrosa)— schedule & NPK

Also called London Pride, St Patrick's Cabbage, Prattling Parnell.

More about london pride

About London Pride

Saxifraga umbrosa · also called London Pride, St Patrick's Cabbage · flowering

London Pride is a tough, shade-tolerant evergreen perennial forming rosettes of leathery, spoon-shaped leaves. In late spring it sends up airy sprays of tiny pale-pink flowers on slender red stems. Reliable and low-maintenance, it thrives in moist, well-drained soil and is an excellent ground-cover for shady borders and rockeries.

Growth habit: Rosette-forming evergreen perennial; slowly spreading by offsets to form a low mat 15–20 cm tall, with erect flower stems reaching 30–40 cm in bloom.

Watch for — Vine weevil: Larvae feed on roots, causing sudden wilting and plant collapse. Check compost for creamy grubs; treat with nematodes (Steinernema kraussei) in autumn or spring when soil is moist and above 5 °C.

What fertiliser london pride actually wants — and why

London Pride 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 london pride: 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 london pride, 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 london pride:

Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as growth resumes. A single annual feeding is generally sufficient; over-fertilising promotes lush foliage at the expense of flowers. In practice: no routine feeding at all for london pride — 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 london pride 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 london pride

None is the correct answer for london pride. 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 london pride first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the london pride watering schedule.

Signs you are over-feeding london pride

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for london pride:

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.

Signs you are under-feeding london pride

Effectively never an issue — these plants flower on poverty.
Only on genuinely dead soil: weak, thin growth and few blooms.
A short-lived plant in completely spent container compost.

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

Flushing and leaching the salts

If london pride 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 london pride

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 london pride.

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 london pride — frequently asked questions

What fertiliser does london pride 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. London Pride 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 london pride?

Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as growth resumes. A single annual feeding is generally sufficient; over-fertilising promotes lush foliage at the expense of flowers. Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as growth resumes. A single annual feeding is generally sufficient; over-fertilising promotes lush foliage at the expense of flowers. In practice: no routine feeding at all for london pride — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for london pride?