Quercus palustris Green Pillar ('Pringreen')

RHS Plant Profile

pin oak [Green Pillar]

Synonyms

Quercus palustris 'Pringreen'

Trees

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A deciduous, columnar tree with a strong central leader and verticle side branches, spreading slightly with age. The leaves are 15cm long, glossy, deeply lobed, green in spring and summer and turning scarlet to reddish brown in autumn.

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

2.5-4 metres

Size

Time to Maturity: more than 50 years
Max Spread: 2.5-4 metres
Max Height: Higher than 12 metres

Growing Conditions

Clay Loam Sand

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

Position

Full sun Partial shade

Aspect: East–facing or North–facing or South–facing or West–facing
Exposure: Exposed
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: Deciduous
Habit: Columnar upright
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: Trade

How to Grow

Cultivation

This tall, narrow deciduous tree will grow in most deep well-drained acid to neutral soils but will not tolerate chalk or limestone. This tree is ideal for planting in avenues or as a street tree.

Propagation

Propagate by seed, sowing as soon as ripe, in a cold frame but may not come true to type. Grafting can be carried out in mid-autumn or early winter

Suggested planting locations and garden types

Architectural
City and courtyard gardens

Pruning

Pruning group 1

Pests

May be susceptible to gall wasps and aphids

Diseases

May be susceptible to powdery mildews and honey fungus