Repotting guide

When & how to repot Tormentil (Potentilla erecta)

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.

Mature size: 5–20 cm tall, spreading to 30–40 cm or more

Watch for — Powdery mildew in dry periods: In dry, warm summers the foliage may develop powdery mildew, especially in sheltered spots with poor air circulation. Improve ventilation and avoid wetting the foliage when watering.

How to tell tormentil needs repotting

Repotting on a calendar is less reliable than reading the plant. For tormentil, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for tormentil) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot tormentil

Only every 2–4 years, when genuinely crowded. Tormentil is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Creeping, mat-forming perennial with slender rooting stems.

What size pot to step tormentil up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Tormentil positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping tormentil into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot tormentil

Early spring, just as new growth restarts, is the ideal window for tormentil. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting tormentil

Confirm it actually needs it. Slide tormentil out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip tormentil out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh acidic to neutral, free-draining, low-fertility soil (ph 4.5–6.5), set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water tormentil again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for tormentil

Tormentil wants acidic to neutral, free-draining, low-fertility soil (ph 4.5–6.5). Sandy or peaty, low-nutrient soils replicate its heathland habitat best. A mix of lime-free loam, sharp sand, and a little fine peat or composted bark works well. Never use alkaline compost, chalk grit, or lime, as Tormentil is intolerant of calcium-rich soils. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tormentil — frequently asked questions

How often should you repot tormentil?

Only every 2–4 years, when genuinely crowded for tormentil. Only repot tormentil every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using acidic to neutral, free-draining, low-fertility soil (ph 4.5–6.5). The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does tormentil need?

When is the best time of year to repot tormentil?

Does tormentil like to be root-bound?

Yes — tormentil genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise tormentil after repotting?

Not immediately. Wait about 4 weeks after repotting tormentil. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.