Fertilising guide

How to fertilise Japanese Maple (Acer palmatum)— schedule & NPK

Also called Japanese maple.

More about japanese maple

About Japanese Maple

Acer palmatum · also called Japanese maple · flowering

Japanese maple is a slow-growing deciduous tree or large shrub prized for its delicate palmate leaves and spectacular autumn color in reds, oranges, and gold. Tiny reddish-purple spring flowers give way to winged samaras. It thrives in dappled shade with shelter from wind and hot afternoon sun, in moist, acidic, well-drained soil, and adapts well to large containers and bonsai.

Growth habit: Slow-growing deciduous tree or multi-stemmed large shrub with a graceful, layered, often rounded canopy; many forms are naturally compact.

What fertiliser japanese maple actually wants — and why

Japanese Maple is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.

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 maple: 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 maple, 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 maple:

Light feeder; apply a slow-release balanced or ericaceous fertiliser once in early spring. Avoid high-nitrogen feeds, which force soft growth prone to scorch and weaken autumn color. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.

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

Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for japanese maple. The variable that actually matters is pH, not concentration.

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

Signs you are over-feeding japanese maple

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

Brown, scorched leaf margins from too strong or too frequent a dose.
White salt crust on the soil surface.
Soft, lush growth that fruits or flowers poorly.

Signs you are under-feeding japanese maple

Yellowing leaves with green veins (iron chlorosis from high pH).
Weak growth, poor cropping and an overall pale, stressed look.
Stunted new shoots in spring despite adequate water and light.

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

Flushing and leaching the salts

Flush japanese maple with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.

Organic vs synthetic feeds for japanese maple

Organic options

Composted pine bark, pine-needle mulch, used coffee grounds and an organic ericaceous feed gently maintain acidity. UK: Vitax or Westland Ericaceous; US: Espoma Holly-tone or Dr. Earth Acid Lovers. Slow, soil-improving, hard to overdo.

Synthetic / liquid feeds

A liquid or granular ericaceous feed — UK: Miracle-Gro Ericaceous, Vitax or Westland; US: Miracle-Gro Acid-Loving Plant Food or Espoma Holly-tone. Pair with rainwater and an acidic mulch for it to work.

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 maple — frequently asked questions

What fertiliser does japanese maple need?

An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves. Japanese Maple is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.

How often should I feed japanese maple?

Light feeder; apply a slow-release balanced or ericaceous fertiliser once in early spring. Avoid high-nitrogen feeds, which force soft growth prone to scorch and weaken autumn color. Light feeder; apply a slow-release balanced or ericaceous fertiliser once in early spring. Avoid high-nitrogen feeds, which force soft growth prone to scorch and weaken autumn color. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.

What strength of feed for japanese maple?