Japanese Apricot (Ume) care

Light

Japanese Apricot needs sun on the leaves, not just bright ambient room light. Full sun outdoors is essential for strong flower-bud formation and dense flowering; shade produces sparse bloom and leggy growth. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water japanese apricot when the top 1-2 cm of soil dries, often daily in summer. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Keep evenly moist during the growing season but allow slight drying between waterings to firm up flower buds. Avoid waterlogging, and reduce watering markedly during winter dormancy.

Soil and pot

Japanese Apricot grows best in free-draining bonsai mix. A blend of akadama with pumice and lava grit drains well while holding moisture. Neutral to slightly acidic soil suits ume best; sharp drainage helps prevent root rot. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Japanese Apricot sits happiest at around Ambient outdoor humidity humidity and -10 to 30°C (14 to 86°F). Needs no extra humidity as a hardy outdoor bonsai. Good air movement reduces the risk of fungal leaf and shoot diseases common to Prunus. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed japanese apricot sparingly. Feed every two weeks from after flowering through late summer with a balanced bonsai fertiliser, shifting to lower nitrogen and higher phosphorus in late summer to set flower buds. Do not feed while dormant or in bloom. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on japanese apricot in the Growli community. Each is annotated with the most common cause so you know where to start.

• Sparse flowering — Pruning at the wrong time or too little sun removes flower buds, which form on old wood; prune immediately after bloom and site in full sun.
• Aphids on new growth — Prunus is highly aphid-prone in spring; rinse or treat with insecticidal soap before honeydew and sooty mould develop.
• Fungal leaf and shoot diseases — Leaf spot, blossom blight and silver leaf can affect ume; prune cleanly with disinfected tools and remove infected material promptly.
• Winter bud loss — Without an adequate cold rest or with desiccating frost on buds, flowering is poor; give a proper dormancy and shelter swelling buds from hard freezes.

Propagation

Propagated from semi-hardwood cuttings in summer, by grafting choice cultivars onto Prunus rootstock, or by air-layering. Seed requires cold stratification and seedlings vary in flower colour. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Japanese Apricot is toxic to pets. Prunus mume belongs to the genus the ASPCA lists as toxic to dogs, cats and horses (e.g. Apricot, Plum, Cherry). The toxic principle is cyanogenic glycosides in the stems, leaves and seeds (kernels), most dangerous when wilting. Signs include brick-red gums, dilated pupils, panting, difficulty breathing and shock. Keep prunings and pits away from pets. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Japanese Apricot deep-dive guides

Every aspect of japanese apricot care, each with its own calibrated guide:

• Japanese Apricot watering schedule
• Japanese Apricot light requirements
• Best soil mix for japanese apricot
• Japanese Apricot fertilizing guide
• When to repot japanese apricot
• How to propagate japanese apricot
• Japanese Apricot growth rate & size
• Japanese Apricot cold hardiness
• Japanese Apricot temperature & humidity
• Is japanese apricot toxic to cats & dogs?
• Is japanese apricot toxic to cats?
• Is japanese apricot toxic to dogs?
• Getting japanese apricot to bloom

Featured in these plant shortlists

Japanese Apricot qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Japanese Apricot is also known as Japanese Apricot, Ume, and Chinese Plum.

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• All 5561 plant care guides in the Growli library