Fertilising guide

How to fertilise Kalanchoe (Kalanchoe blossfeldiana)— schedule & NPK

Also called flaming Katy, Christmas kalanchoe, Madagascar widow’s thrill.

About Kalanchoe

Kalanchoe blossfeldiana · also called flaming Katy, Christmas kalanchoe · flowering

Kalanchoe is a compact succulent from Madagascar grown for its clusters of small red, pink, yellow or orange flowers. It blooms in winter and lasts for weeks, making it a popular gift plant. Toxic to pets.

Kalanchoe blossfeldiana (Flaming Katy) is a succulent native to Madagascar, adapted to bright, warm conditions with marked dry periods, which is why it stores water in its thick, fleshy leaves.

Feed lightly with a balanced or bloom fertilizer only during active growth; succulents need little fertilizer, and excess nitrogen produces lush leaves at the expense of the long-lasting flower clusters.

Growth habit: Compact succulent rosette

Sources: aspca.org, plants.ces.ncsu.edu, hgic.clemson.edu

What fertiliser kalanchoe actually wants — and why

Kalanchoe is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

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 kalanchoe: 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 kalanchoe, 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 kalanchoe:

Half-strength cactus or bloom feed monthly during the growing season; switch to a higher-phosphorus feed when buds form. The pattern that matters: feed little and often through active growth and budding — monthly — and ease right off during the rest period that triggers the next flush.

The dormant-season rule matters more than the exact interval: skip feeding entirely when kalanchoe 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 kalanchoe

Very dilute — quarter strength, the classic "weakly, weekly" approach for kalanchoe. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.

Feeding always goes onto already-damp soil, never dry roots — water kalanchoe first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the kalanchoe watering schedule.

Signs you are over-feeding kalanchoe

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

Lush green leaves but few or no flowers (too much nitrogen).
Brown, scorched leaf tips and edges — a classic fine-root burn.
White salt crust on the medium or pot, and stalled buds.
Bud blast: buds forming then shrivelling and dropping.

Signs you are under-feeding kalanchoe

Sparse or no flowering despite good light and the right season.
Smaller, paler new leaves and a generally weak, tired plant.
Flowers that are smaller or fade faster than they should.

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

Flushing and leaching the salts

Specialist and bloom feeds leave salts that scorch fine roots — flush kalanchoe thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.

Organic vs synthetic feeds for kalanchoe

Organic options

Gentler options exist: a dilute seaweed feed (mildly potassium-rich) or worm-casting tea. UK: Westland seaweed, or a dilute tomato feed like Tomorite for bud-formers; US: Espoma Orchid! / Violet! or Neptune's Harvest. Lower burn risk, slower response.

Synthetic / liquid feeds

A species-matched bloom feed at quarter strength — UK: Baby Bio Orchid / African Violet food, or a high-potash Tomorite/Phostrogen for budding bloomers; US: Miracle-Gro Orchid or Bloom Booster, Schultz African Violet.

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 kalanchoe — frequently asked questions

What fertiliser does kalanchoe need?

A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers. Kalanchoe is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

How often should I feed kalanchoe?

Half-strength cactus or bloom feed monthly during the growing season; switch to a higher-phosphorus feed when buds form. Half-strength cactus or bloom feed monthly during the growing season; switch to a higher-phosphorus feed when buds form. The pattern that matters: feed little and often through active growth and budding — monthly — and ease right off during the rest period that triggers the next flush.

What strength of feed for kalanchoe?

What does over-feeding kalanchoe look like?

Lush green leaves but few or no flowers (too much nitrogen). Brown, scorched leaf tips and edges — a classic fine-root burn. White salt crust on the medium or pot, and stalled buds. Bud blast: buds forming then shrivelling and dropping. Using an ordinary high-nitrogen houseplant feed on kalanchoe is the headline mistake — you get a healthy-looking plant that simply refuses to bloom. The second is feeding through the rest period and breaking the dormancy cue it needs to set buds.

Should I flush the soil of kalanchoe?