Fertilising guide
How to fertilise Bulbous Buttercup (Ranunculus bulbosus)— schedule & NPK
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.
Growth habit: Compact, clump-forming perennial with a swollen, corm-like stem base; summer-dormant after seed set.
Watch for — Competition from vigorous grasses: In grassland settings the bulbous buttercup is easily suppressed by coarse, rank grass growth; manage surrounding sward height and avoid fertilising to keep the plant's low-fertility niche open.
What fertiliser bulbous buttercup actually wants — and why
Bulbous Buttercup is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 bulbous buttercup: 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 bulbous buttercup, 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 bulbous buttercup:
No feeding required or recommended; high fertility produces coarse, leafy growth that can suppress flowering and makes the plant uncharacteristically large. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when bulbous buttercup 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 bulbous buttercup
Half strength is the safe default for bulbous buttercup — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water bulbous buttercup first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bulbous buttercup watering schedule.
Signs you are over-feeding bulbous buttercup
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bulbous buttercup:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding bulbous buttercup
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full bulbous buttercup care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of bulbous buttercup with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for bulbous buttercup
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 bulbous buttercup — frequently asked questions
What fertiliser does bulbous buttercup need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Bulbous Buttercup is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed bulbous buttercup?
No feeding required or recommended; high fertility produces coarse, leafy growth that can suppress flowering and makes the plant uncharacteristically large. No feeding required or recommended; high fertility produces coarse, leafy growth that can suppress flowering and makes the plant uncharacteristically large. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for bulbous buttercup?
Half strength is the safe default for bulbous buttercup — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding bulbous buttercup look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding bulbous buttercup year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of bulbous buttercup?
Flush the pot of bulbous buttercup with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Bulbous Buttercup care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water bulbous buttercup — 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 pires's sinningia
- How to fertilise carmine begonia
- How to fertilise bottle gentian
- All 10153 fertilising guides in the Growli library