Fertilising guide
How to fertilise Tormentil (Potentilla erecta)— schedule & NPK
Also called Tormentil, Common Tormentil, Bloodroot.
More about tormentil
About Tormentil
Potentilla erecta · also called Tormentil, Common Tormentil · flowering
Tormentil is a creeping, mat-forming perennial native to acidic grasslands, heathlands, moors, and open woodland edges across Europe and the UK, recognisable by its small, bright-yellow four-petalled flowers produced from May to September. It requires well-drained, acidic to neutral, low-fertility soil and full sun to light shade. The most important care fact is that it is a calcifuge — it will not grow on chalk or alkaline soils. It is not listed by the ASPCA as toxic to pets.
Growth habit: Creeping, mat-forming perennial with slender rooting stems
What fertiliser tormentil actually wants — and why
Tormentil 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 tormentil: 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 tormentil, 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 tormentil:
No fertiliser needed; excess nutrients promote lush foliage at the expense of flowers and reduce hardiness. In practice: no routine feeding at all for tormentil — 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 tormentil 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 tormentil
None is the correct answer for tormentil. 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 tormentil first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the tormentil watering schedule.
Signs you are over-feeding tormentil
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for tormentil:
- 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 tormentil
- 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 tormentil care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
If tormentil 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 tormentil
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 tormentil.
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 tormentil — frequently asked questions
What fertiliser does tormentil 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. Tormentil 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 tormentil?
No fertiliser needed; excess nutrients promote lush foliage at the expense of flowers and reduce hardiness. No fertiliser needed; excess nutrients promote lush foliage at the expense of flowers and reduce hardiness. In practice: no routine feeding at all for tormentil — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
What strength of feed for tormentil?
None is the correct answer for tormentil. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
What does over-feeding tormentil 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 tormentil 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 tormentil?
If tormentil 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.
Keep reading
- Tormentil care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water tormentil — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise grefsheim spirea
- How to fertilise birchleaf spirea
- How to fertilise glossy abelia
- All 10153 fertilising guides in the Growli library