Fertilising guide
How to fertilise Keitt Mango (Mangifera indica 'Keitt')— schedule & NPK
Also called Keitt mango.
More about keitt mango
About Keitt Mango
Mangifera indica 'Keitt' · also called Keitt mango · tropical
'Keitt' is a very late-season mango bearing large, sweet, nearly fibreless green-skinned fruit that often stays greenish when ripe. A tropical evergreen, it needs heat, full sun and a dry spell to flower, and tolerates marginal warm climates better than many. Frost-sensitive, it crops outdoors only in frost-free zones, or under glass elsewhere.
Growth habit: Medium to large evergreen tree with a moderately vigorous, spreading, rounded canopy. Flowers in terminal panicles after a cool, dry rest and ripens its very large fruit late in the season. A consistent, productive bearer.
What fertiliser keitt mango actually wants — and why
Keitt Mango 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 keitt mango: 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 keitt mango, 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 keitt mango:
Use a balanced fruit-tree fertiliser through the growing season, easing off before bloom. Raise potassium as the large fruit develops; favour nitrogen for young trees. Because the crop ripens very late, maintain steady mid-season nutrition but avoid heavy late feeding. 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 keitt mango 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 keitt mango
Half strength is the safe default for keitt mango — 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 keitt mango first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the keitt mango watering schedule.
Signs you are over-feeding keitt mango
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for keitt mango:
- 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 keitt mango
- 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 keitt mango care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of keitt mango 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 keitt mango
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 keitt mango — frequently asked questions
What fertiliser does keitt mango 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. Keitt Mango 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 keitt mango?
Use a balanced fruit-tree fertiliser through the growing season, easing off before bloom. Raise potassium as the large fruit develops; favour nitrogen for young trees. Because the crop ripens very late, maintain steady mid-season nutrition but avoid heavy late feeding. Use a balanced fruit-tree fertiliser through the growing season, easing off before bloom. Raise potassium as the large fruit develops; favour nitrogen for young trees. Because the crop ripens very late, maintain steady mid-season nutrition but avoid heavy late feeding. 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 keitt mango?
Half strength is the safe default for keitt mango — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding keitt mango 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 keitt mango 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 keitt mango?
Flush the pot of keitt mango 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
- Keitt Mango care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water keitt mango — 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 monstera
- How to fertilise pothos
- How to fertilise fiddle leaf fig
- All 5561 fertilising guides in the Growli library