Fertilising guide

How to fertilise Zantedeschia 'Flame' (Zantedeschia 'Flame')— schedule & NPK

Also called Flame calla lily, red-orange calla.

More about zantedeschia 'flame'

About Zantedeschia 'Flame'

Zantedeschia 'Flame' · also called Flame calla lily, red-orange calla · flowering

Zantedeschia 'Flame' is a compact hybrid calla lily whose spathes open golden yellow and mature to fiery orange-red, above white-speckled green leaves. A tender tuberous perennial, it needs warmth, bright light and fertile, moist, well-drained soil. Lift the rhizome before frost in cold regions. Excellent in pots and summer bedding at around 35-45 cm.

Growth habit: Tender rhizomatous perennial forming a low, clumping mound of speckled leaves with upward-facing funnel spathes; dies back to the rhizome in winter.

Watch for — Few blooms: Excess nitrogen or shade reduces flowering. Use a potassium-rich feed and a brighter position to encourage repeat blooms.

What fertiliser zantedeschia 'flame' actually wants — and why

Zantedeschia 'Flame' 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 zantedeschia 'flame': 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 zantedeschia 'flame', 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 zantedeschia 'flame':

Feed every 2-3 weeks during active growth with a balanced or potassium-rich liquid fertiliser to maximise the bright blooms. Avoid heavy nitrogen, which pushes leaf at the expense of flowers; cease feeding as dormancy begins. In practice: no routine feeding at all for zantedeschia 'flame' — 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 zantedeschia 'flame' 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 zantedeschia 'flame'

None is the correct answer for zantedeschia 'flame'. 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 zantedeschia 'flame' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the zantedeschia 'flame' watering schedule.

Signs you are over-feeding zantedeschia 'flame'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for zantedeschia 'flame':

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 zantedeschia 'flame'

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 zantedeschia 'flame' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If zantedeschia 'flame' 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 zantedeschia 'flame'

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 zantedeschia 'flame'.

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 zantedeschia 'flame' — frequently asked questions

What fertiliser does zantedeschia 'flame' 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. Zantedeschia 'Flame' 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 zantedeschia 'flame'?

Feed every 2-3 weeks during active growth with a balanced or potassium-rich liquid fertiliser to maximise the bright blooms. Avoid heavy nitrogen, which pushes leaf at the expense of flowers; cease feeding as dormancy begins. Feed every 2-3 weeks during active growth with a balanced or potassium-rich liquid fertiliser to maximise the bright blooms. Avoid heavy nitrogen, which pushes leaf at the expense of flowers; cease feeding as dormancy begins. In practice: no routine feeding at all for zantedeschia 'flame' — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for zantedeschia 'flame'?