Quercus × crenata 'Ambrozyana'

RHS Plant Profile

oak 'Ambrozyana

Synonyms

Quercus × lucombeana 'Ambrozyana'
Quercus cerris 'Ambrozyana'
Quercus × hispanica 'Ambrozyana'
Quercus ambrozyana

Trees

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A semi-evergreen, bushy tree with a broadly ovate crown and thick, fissured bark, eventually reaching up to around 14m high. Oblong to ovate leaves are up to 12cm long with a leathery texture and 6-9 shallow lobes. The dark green leaves have a greyish-green felty underside and often persist on the trees until spring unless the winter weather is very severe

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity: 20–50 years
Max Spread: wider than 8 metres
Max Height: Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–facing or North–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Fagaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Bushy
Potentially harmful: Pets (dogs): Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Quercus can be deciduous or evergreen trees or shrubs, with entire, lobed or toothed leaves; flowers inconspicuous, followed by characteristic acorns; sometimes good autumn colour
Name Status: Accepted

How to Grow

Cultivation

Grow in deep, fertile, well-drained soil in full sun or partial shade. Trees should retain leaves throughout winter once established unless planted in very exposed positions or subjected to prolonged, severe winter weather. See tree cultivation for further advice

Propagation

Propagate by grafting in mid-autumn or late winter

Suggested planting locations and garden types

Architectural
Coastal
Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to oak processionary moth, aphids, caterpillars, leaf-mining moths and oak gall wasps

Diseases

May be susceptible to powdery mildews and honey fungus