Fertilising guide

How to fertilise Japanese persimmon (Diospyros kaki)— schedule & NPK

Also called Japanese persimmon, Oriental persimmon, Sharon fruit, Kaki.

More about japanese persimmon

About Japanese persimmon

Diospyros kaki · also called Japanese persimmon, Oriental persimmon · edible

Japanese persimmon is a beautiful, long-lived deciduous tree producing large, orange to red fruit in autumn. Astringent cultivars (such as 'Hachiya') must fully ripen before eating; non-astringent types ('Fuyu') can be eaten while still firm. Exceptionally ornamental in autumn with brilliant foliage and hanging fruit. Low-maintenance once established, requiring minimal spraying compared to other tree fruits.

Growth habit: Deciduous medium to large tree; upright-spreading habit; spectacular autumn foliage of orange, red, and purple; fruit persists on bare branches after leaf fall

What fertiliser japanese persimmon actually wants — and why

Japanese persimmon feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

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 japanese persimmon: 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 japanese persimmon, 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 japanese persimmon:

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

Follow the crop-feed label rate for japanese persimmon — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.

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

Signs you are over-feeding japanese persimmon

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

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
Lush foliage hiding the crop; soft growth prone to pests and disease.
Salt crust on the soil and scorched leaf edges in containers.

Signs you are under-feeding japanese persimmon

Pale, yellowing lower leaves and stunted growth.
Small fruit, poor set, and a quickly exhausted plant.
Blossom-end rot and weak cropping from erratic or insufficient feeding.

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

Flushing and leaching the salts

In containers, fertiliser salts build up fast — water japanese persimmon thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.

Organic vs synthetic feeds for japanese persimmon

Organic options

Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.

Synthetic / liquid feeds

A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.

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 japanese persimmon — frequently asked questions

What fertiliser does japanese persimmon need?

Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. Japanese persimmon feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.

How often should I feed japanese persimmon?

Light feeder — apply a balanced fertilizer (10-10-10) in early spring at 0.5–1 lb per year of tree age (max 12 lb per mature tree). Overfertilizing with nitrogen causes excessive vegetative growth and fruit drop. A potassium-dominant feed in midsummer improves fruit quality and color. Container trees need monthly liquid feeding. Light feeder — apply a balanced fertilizer (10-10-10) in early spring at 0.5–1 lb per year of tree age (max 12 lb per mature tree). Overfertilizing with nitrogen causes excessive vegetative growth and fruit drop. A potassium-dominant feed in midsummer improves fruit quality and color. Container trees need monthly liquid feeding. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).

What strength of feed for japanese persimmon?

What does over-feeding japanese persimmon look like?

Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once japanese persimmon starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.

Should I flush the soil of japanese persimmon?