Fertilising guide
How to fertilise Crimson Water Lily (Nymphaea 'Laydekeri Fulgens')— schedule & NPK
Also called Crimson Water Lily, Fulgens Water Lily, Red Laydekeri.
More about crimson water lily
About Crimson Water Lily
Nymphaea 'Laydekeri Fulgens' · also called Crimson Water Lily, Fulgens Water Lily · flowering
One of the most richly coloured of all hardy water lilies, 'Laydekeri Fulgens' bears deep crimson-magenta flowers with contrasting orange-red stamens from June to September. A compact Laydeker hybrid suited to small to medium ponds, it is exceptionally hardy and free-flowering. Leaves emerge purple-blotched, maturing to plain green, adding seasonal foliage interest.
Growth habit: Compact rhizomatous aquatic perennial forming a relatively small leaf spread. Young leaves emerge with attractive purple blotching, aging to plain mid-green. Day-blooming; flowers open in morning and close by late afternoon. Fully dormant in winter.
Watch for — Fading flower colour in very hot water: In shallow ponds in hot climates, water temperatures above 30°C can cause flower colour to fade from deep crimson to pale pink. Ensure adequate depth (at least 30 cm) to buffer water temperature.
What fertiliser crimson water lily actually wants — and why
Crimson Water Lily flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.
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 crimson water 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 crimson water 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 crimson water lily:
Apply slow-release aquatic fertiliser tablets pushed into the compost near the rhizome monthly from May through August. As a compact cultivar, it needs proportionally less feeding than large-growing varieties; avoid overfeeding, which encourages excessive leaf growth at the expense of flowers. In practice: no routine feeding at all for crimson water lily — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
The dormant-season rule matters more than the exact interval: skip feeding entirely when crimson water 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 crimson water lily
None is the correct answer for crimson water lily. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
Feeding always goes onto already-damp soil, never dry roots — water crimson water lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the crimson water lily watering schedule.
Signs you are over-feeding crimson water lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for crimson water lily:
- Abundant leafy growth and very few flowers (the classic over-rich symptom).
- Soft, floppy stems and a sprawling, leafy habit.
- Scorched edges and salt crust if it has been fed in a container.
Signs you are under-feeding crimson water lily
- Effectively never an issue — these plants flower on poverty.
- Only on genuinely dead soil: weak, thin growth and few blooms.
- A short-lived plant in completely spent container compost.
If the symptoms point at watering, light or roots rather than nutrition, the full crimson water lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
If crimson water lily has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Organic vs synthetic feeds for crimson water lily
Organic options
A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.
Synthetic / liquid feeds
None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in crimson water lily.
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 crimson water lily — frequently asked questions
What fertiliser does crimson water lily need?
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Crimson Water Lily flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
How often should I feed crimson water lily?
Apply slow-release aquatic fertiliser tablets pushed into the compost near the rhizome monthly from May through August. As a compact cultivar, it needs proportionally less feeding than large-growing varieties; avoid overfeeding, which encourages excessive leaf growth at the expense of flowers. Apply slow-release aquatic fertiliser tablets pushed into the compost near the rhizome monthly from May through August. As a compact cultivar, it needs proportionally less feeding than large-growing varieties; avoid overfeeding, which encourages excessive leaf growth at the expense of flowers. In practice: no routine feeding at all for crimson water lily — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
What strength of feed for crimson water lily?
None is the correct answer for crimson water lily. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
What does over-feeding crimson water lily look like?
Abundant leafy growth and very few flowers (the classic over-rich symptom). Soft, floppy stems and a sprawling, leafy habit. Scorched edges and salt crust if it has been fed in a container. Feeding crimson water lily at all — especially "to help it flower" — is the defining mistake. Rich soil gives you a big green plant and almost no blooms; restraint is what produces the flowers.
Should I flush the soil of crimson water lily?
If crimson water lily has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Keep reading
- Crimson Water Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water crimson water 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 catalpa bignonioides
- How to fertilise catalpa bignonioides 'aurea'
- How to fertilise catalpa speciosa
- All 6887 fertilising guides in the Growli library