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Fertilising guide

How to fertilise Bird-in-a-bush (Corydalis solida)— schedule & NPK

Also called Bird-in-a-bush, Fumewort, Spring Fumitory, Solid-tubered Corydalis.

More about bird-in-a-bush

About Bird-in-a-bush

Corydalis solida · also called Bird-in-a-bush, Fumewort · flowering

Bird-in-a-bush is a tuberous, spring-ephemeral perennial of the poppy family (Papaveraceae) native to Europe and temperate Asia, naturalised in parts of Britain. It emerges from a solid, rounded corm in early spring, producing greyish-green divided leaves and dense racemes of purple-pink spurred flowers before dying down completely by mid-June. The key care point is to plant corms at 5–7 cm depth in humus-rich, well-drained soil in dappled shade and leave them undisturbed once established. Plant material contains alkaloids and is toxic to cats and dogs.

Growth habit: Spring-ephemeral tuberous perennial; produces compact basal leaf rosettes and short, upright flower racemes before dying back completely to the corm by early summer.

What fertiliser bird-in-a-bush actually wants — and why

Bird-in-a-bush 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 bird-in-a-bush: 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 bird-in-a-bush, 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 bird-in-a-bush:

Apply a top-dressing of well-rotted leaf mould or a light dose of balanced fertiliser just as shoots emerge in late winter; no feeding is needed once in flower or during dormancy. 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 bird-in-a-bush 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 bird-in-a-bush

Half strength is the safe default for bird-in-a-bush — 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 bird-in-a-bush first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bird-in-a-bush watering schedule.

Signs you are over-feeding bird-in-a-bush

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bird-in-a-bush:

Signs you are under-feeding bird-in-a-bush

If the symptoms point at watering, light or roots rather than nutrition, the full bird-in-a-bush care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of bird-in-a-bush 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 bird-in-a-bush

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 bird-in-a-bush — frequently asked questions

What fertiliser does bird-in-a-bush 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. Bird-in-a-bush 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 bird-in-a-bush?

Apply a top-dressing of well-rotted leaf mould or a light dose of balanced fertiliser just as shoots emerge in late winter; no feeding is needed once in flower or during dormancy. Apply a top-dressing of well-rotted leaf mould or a light dose of balanced fertiliser just as shoots emerge in late winter; no feeding is needed once in flower or during dormancy. 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 bird-in-a-bush?

Half strength is the safe default for bird-in-a-bush — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding bird-in-a-bush 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 bird-in-a-bush 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 bird-in-a-bush?

Flush the pot of bird-in-a-bush 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.

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