• In cultivation
PumpkinSky, CC BY-SA 4.0, via Wikimedia Commons
  • PumpkinSky, CC BY-SA 4.0, via Wikimedia Commons

Nashi Pear Kosui - Pyrus pyrifolia 'Kosui'

Pyrus pyrifolia 'Kosui'

Nashi Kosui: bronze-golden round fruits with crisp, juicy flesh. Not self-fertile, needs pollination. Low-stem tree. Harvest mid-August.

Availability date: 30/06/2026

Description

Height at maturity 2.5 to 3.5 m
Spread at maturity 2.5 to 3 m
Exposure Sun, partial shade
Flowering period April
Hardiness -20°C

Nashi Pear Kosui – Pyrus pyrifolia 'Kosui'

Main interest

The Nashi pear 'Kosui' is an old Asian variety. Its fruit is appreciated for its very crisp, juicy and subtly sweet flesh, with little acidity. The round fruits, golden with copper highlights, are harvested from mid‑August, making it one of the earliest Nashi cultivars. Grafted on a low stem, it is perfectly suited to small gardens. Note: 'Kosui' is not self‑fertile and requires a compatible pollinator.

Origins and characteristics

  • Geographical origin: Japan, obtained in 1959 by crossing ‘Kikusui’ and ‘Wasekozo’
  • Botanical family: Rosaceae
  • Notable features: Highly appreciated in Asia for its crisp texture and digestibility. One of the sweetest Nashi varieties.

Description and particularities

  • Adult height: 2.5 to 3.5 m (low‑stem form)
  • Adult width: 2.5 to 3 m
  • Habit: Compact, slightly spreading
  • Bark: Smooth, light grey
  • Foliage: Deciduous, dark green, thick leaves
  • Growth: Medium to fast
  • Hardiness: Good, down to -18/-20 °C

Flowering and fruiting

  • Flowering period: Early April (mid‑early)
  • Flowers: White, clustered, very melliferous
  • Fruits: Round, bronze‑gold, crisp white flesh, very juicy and sweet, with low acidity. Harvest from mid‑August to September.
  • Storage: 2 to 3 weeks in a cool, dark place

Exposure and soil

  • Ideal exposure: Full sun
  • Soil: Light, deep, fertile, well‑drained
  • pH: Neutral to slightly acidic

Planting

  • Soil preparation: Mix mature compost, potting soil and a little ericaceous soil; ensure good drainage
  • Spacing: 3 to 4 m
  • Planting period: November to March, outside frost periods

Watering

  • At planting: Regular watering, without excess
  • At maturity: Moderate needs, appreciates summer moisture

Pruning

  • When and how: Train as an open vase or palmette; light winter pruning to encourage flowering

Propagation

  • Method: Grafted onto quince rootstock

Garden uses

  • Ideal locations: Small orchards, fruit hedges, kitchen gardens
  • Recommended associations: Nashi ‘Hosui’, ‘Shinseiki’, pear ‘Williams’, aromatic herbs

Disease protection

  • Sensitivities: Resistant to scab, moderately sensitive to fire blight
  • Natural prevention: Air the canopy, horsetail decoction, avoid excessive humidity

Tips for good development

Plant in full sun, moderate watering, summer mulching to retain moisture.

Cross‑pollination required

The cultivar 'Kosui' is not self‑fertile. It requires compatible pollinators such as:

  • Pyrus pyrifolia ‘Hosui’
  • Pyrus pyrifolia ‘Shinseiki’
  • Pyrus communis ‘Williams’

Caractéristiques

  • Common name : Nashi Pear Kosui
  • Family : Rosaceae
  • Category : grafted low stem fruit tree
  • Spread : 2.5 to 3 m
  • Foliage : deciduous
  • Fruit : Round, bronze-gold, with crisp white flesh, very juicy and sweet
  • Use : isolated - orchard
  • Soil : neutral to acid
  • Enemies : aphids - caterpillars
  • Possible diseases : resistant to diseases
  • rootstock : Cydonia Oblonga K.Adams

Shipping & delivery

How does the delivery work?

  • Step 1 As soon as you place your order your plants are selected
  • Step 2 Each order is processed individually.
  • Step 3 Plants are packed, staked and labeled.
  • Step 4 Packaging is carefully implemented to avoid any problems.
  • Step 5 Packages are ready to be shipped.

Nos méthodes de livraison

Expédition de nos plantes dans toute l'Europe (sauf en outre mer et les îles).

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