Repotting guide

When & how to repot Bulbous Buttercup (Ranunculus bulbosus)

Also called Bulbous Buttercup, Bulbous Crowfoot, St Anthony's Turnip.

More about bulbous buttercup

About Bulbous Buttercup

Ranunculus bulbosus · also called Bulbous Buttercup, Bulbous Crowfoot · flowering

Ranunculus bulbosus is a compact, early-flowering perennial native to dry, calcareous grassland across Europe and parts of western Asia, distinguished from other buttercups by its swollen, corm-like stem base (the 'bulb') and reflexed sepals beneath the glossy yellow flowers. It flowers earlier than the meadow buttercup (typically April to June) and then dies back in summer, making it the ideal buttercup for drier, well-drained soils where the other species would struggle. The bulbous base stores energy through the summer drought, and the plant re-emerges from autumn onwards. All parts are toxic to cats, dogs, and horses.

Mature size: 20–40 cm tall in flower; clumps 15–25 cm wide.

How to tell bulbous buttercup needs repotting

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

Flowering has tailed off year on year and the clump has become congested and overcrowded.
Lots of leaf and few flowers — a classic sign that bulbous buttercup bulbs or tubers need lifting and dividing.
Bulbs visibly bursting the pot or pushing each other to the surface.
It is the natural dormancy window (foliage yellowed and died back) — the only safe time to lift and split.

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 bulbous buttercup

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, bulbous buttercup is lifted and divided once the clump congests and flowering drops off. Compact, clump-forming perennial with a swollen, corm-like stem base; summer-dormant after seed set..

What size pot to step bulbous buttercup up to

Pot size matters less than depth and spacing here. When you replant bulbous buttercup, set the bulbs or tubers at the correct depth (a rough guide: two to three times their own height of soil over the top) and space them so they are not touching. A wide, shallow pot suits a clump better than a tall narrow one.

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 bulbous buttercup

The only safe window is dormancy: wait until the foliage has yellowed and died back naturally, lift and divide then, and replant before or at the start of the next growing season. Disturbing bulbous buttercup in full growth or flower sets it back badly.

Step-by-step: repotting bulbous buttercup

Wait for dormancy. Let bulbous buttercup foliage yellow and die back completely. Lifting while it is in growth wastes the energy it is storing for next year.
Lift carefully. Loosen the soil well away from the bulbs/tubers with a fork and ease the whole clump out without spearing them.
Separate the offsets. Gently pull the clump apart into individual bulbs or tubers. Keep only firm, healthy, blemish-free ones.
Replant at the right depth. Reset them in fresh well-drained, low-fertility, alkaline to neutral loam, chalk, or sandy soil at the correct depth and spacing — not touching — so each has room to bulk up.
Water in and rest. Water once to settle them, then keep on the dry side until growth resumes. Do not feed until leaves are actively growing.

Aftercare

After replanting bulbous buttercup, keep the soil barely moist — not wet — until shoots appear; bulbs and tubers rot in cold, saturated soil. Once leaves are growing strongly, resume normal watering. Hold off feeding until the plant is in active growth again.

The right soil mix for bulbous buttercup

Bulbous Buttercup wants well-drained, low-fertility, alkaline to neutral loam, chalk, or sandy soil. Calcareous grassland is its preferred habitat; the corm rots in waterlogged or overly fertile soils, and the plant is outcompeted by rank growth on enriched ground. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting bulbous buttercup — frequently asked questions

How often should you repot bulbous buttercup?

Lift and divide every 3–4 years once clumps congest for bulbous buttercup. Bulbous Buttercup is lifted and divided, not "repotted". Every 3–4 years, once the foliage has died back and it is dormant, lift the clump, separate the offsets, and replant at the correct depth in well-drained, low-fertility, alkaline to neutral loam, chalk, or sandy soil. Crowding, not pot size, is what reduces flowering over time.

What size pot does bulbous buttercup need?

When is the best time of year to repot bulbous buttercup?

Do you "repot" bulbous buttercup, or lift and divide it?

You lift and divide it. Bulbous Buttercup grows from bulbs or tubers, so instead of repotting you wait for dormancy, lift the congested clump, separate the healthy offsets, and replant them at the right depth and spacing. Doing this every 3–4 years restores flowering.

Should you fertilise bulbous buttercup after repotting?

Hold off feeding bulbous buttercup until it is in active growth again. Fresh soil already carries enough nutrients to get it re-established, and feeding disturbed roots too soon does more harm than good.