Ostrya japonica is a deciduous tree with a rounded habit. Its mid green leaves are ovate to lanceolate with serrate margins, up to 12cm long and 5.5cm broad. Its leaves turn yellow in autumn before they fall. Its bark is dark grey. Its dioecious yellow flowers are in the form of catkins in mid spring with the males being slightly longer than the females. Its fruit are hop like greenish fruit clusters that become brown in autumn.
Ostrya japonica, commonly known as the Japanese Hop Hornbeam is native to Japan, Korea and China. In its native habitat it grows in temperate forests.
The etymological root of the binomial name Ostrya is derived from the Greek ostrua, meaning bone-like which refers to its hard wood. Japonica is derived from the Latin meaning ‘from Japan’.
The landscape architect may find Ostrya japonica useful as an attractive tough tree which will tolerate most conditions.
Ecologically, Ostrya japonica will attract the larvae of some species of lepidoptera will feed on its foliage.
Ostrya japonica prefers moist, fertile, well-drained soils. It tolerates most pH of soil.
Ostrya japonica requires little to no maintenance. Dead or damaged material may be removed in winter.
Genus - Ostrya
Species - Japonica
Common name - Japanese Hophornbeam
Germination rate - 70%
Pre-Treatment - Required
Hardiness zones - 6 - 8
Height - 25'-30' / 7.60 - 9 m
Spread - 15'-20' / 4.60 - 6 m
Plant type - Small tree
Vegetation type - Deciduous
Exposure - Full Sun, Partial Sun
Growth rate - Slow
Soil PH - Acidic, Neutral, Alkaline
Soil type - Moist, well drained
Water requirements - Average, Wet
Landscape uses - The landscape architect may find Ostrya japonica useful as an attractive tough tree which will tolerate most conditions.
Bloom season - Spring, early summer
Leaf / Flower color - Green / Light Green
1. Soak the seeds for 24 hours in warm water. Soaking seeds in warm water with a dash of dish soap prior to stratification has helped improve the germination. It is thought that the soap pierces any oily residue on the surface of the seed allowing water to be imbibed.
2. Place the seeds in a handful of just slightly moist sand or vermiculite and then into a plastic ziplock bag. Seal the bag and leave it in the refrigerator for 60 days.
3. Sow seeds about 1mm deep in a Well drained seed sowing mix at about 12°C.
4. Ostrya seeds will germinate after the stratification done. Sometimes takes a long time, so please be patient.
Normally will only germinate with light, GA-3 may promote germination - even in the dark.
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