Fertilising guide
How to fertilise Pink Calla Lily (Zantedeschia rehmannii)— schedule & NPK
Also called Pink Calla Lily, Pink Arum, Rehmann's Calla.
More about pink calla lily
About Pink Calla Lily
Zantedeschia rehmannii · also called Pink Calla Lily, Pink Arum · flowering
Zantedeschia rehmannii is the original pink calla lily native to eastern South Africa, producing slender, lance-shaped leaves and elegant funnel-shaped spathes in shades of soft pink to deep rose. It grows from rhizomes, thrives in moist to wet conditions, and suits containers, borders, and cutting gardens. Toxic to pets due to calcium oxalate; dies back to rhizome in winter.
Growth habit: Rhizomatous, seasonally dormant perennial; clump-forming
Watch for — Failure to flower: Insufficient sunlight, excessive nitrogen, or rhizomes planted too shallowly inhibit flowering. Plant rhizomes 5–8 cm deep, feed with high-potassium fertiliser, and ensure at least 4 hours of bright light daily.
What fertiliser pink calla lily actually wants — and why
Pink Calla Lily 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 pink calla lily: 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 pink calla lily, 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 pink calla lily:
Feed every 2 weeks during the growing season with a high-potassium liquid fertiliser (e.g. tomato feed) to encourage flower production. Begin feeding when growth emerges in spring and cease after the plant finishes flowering and begins to die back. Avoid excessive nitrogen which promotes foliage over flowers. Treat that as every 2 weeks 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 pink calla lily 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 pink calla lily
Half strength is the safe default for pink calla lily — 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 pink calla lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the pink calla lily watering schedule.
Signs you are over-feeding pink calla lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for pink calla lily:
- 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 pink calla lily
- 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 pink calla lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of pink calla lily 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 pink calla lily
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 pink calla lily — frequently asked questions
What fertiliser does pink calla lily 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. Pink Calla Lily 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 pink calla lily?
Feed every 2 weeks during the growing season with a high-potassium liquid fertiliser (e.g. tomato feed) to encourage flower production. Begin feeding when growth emerges in spring and cease after the plant finishes flowering and begins to die back. Avoid excessive nitrogen which promotes foliage over flowers. Feed every 2 weeks during the growing season with a high-potassium liquid fertiliser (e.g. tomato feed) to encourage flower production. Begin feeding when growth emerges in spring and cease after the plant finishes flowering and begins to die back. Avoid excessive nitrogen which promotes foliage over flowers. Treat that as every 2 weeks 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 pink calla lily?
Half strength is the safe default for pink calla lily — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding pink calla lily 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 pink calla lily 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 pink calla lily?
Flush the pot of pink calla lily 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
- Pink Calla Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water pink calla lily — 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 cosmos
- How to fertilise salvia
- How to fertilise lupine
- All 8452 fertilising guides in the Growli library