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QUERCUS
Commonly known as Oak
Genus of about 530 species of deciduous, semi-evergreen or evergreen trees and shrubs in the beech family widely distributed in woodland and scrub in the northern hemisphere extending to tropical latitudes.
Because of land use changes and climate change many species are under acute threat. In the highlands of Mexico, Central America and the northern Andes forests have been cleared to make coffee plantations and cattle ranching. Pine forests are invading oak in the Indian Himalayas because of temperature rise.
In the UK, Phytopthora ramorum (so-called sudden oak death), a bacterium thought to cause acute oak decline and the oak processionary moth, which causes defoliation, are all modern threats.
Represented in the UK by 2 natives, Sessile or Durmast (Q. petraea), stalked leaves and unstalked acorns and English or Pedunculate (Q. robur) with very short stalks on leaves and long stalks on acorns.
Two other oaks commonly seen are the holm oak (Q. ilex), evergreen, and the Turkey oak (Q. cerris) which was introduced, mistakenly, as a source of good timber.
Further Reading....
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Deciduous
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Evergreen
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Semi-evergreen - Keeps some of its foliage all year, and will drop some leaves as well.
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Tree - some give excellent autumn colour. Male catkins followed by female acorns
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Full sun - evergreen species prefer full sun -
Partial shade -
Additional Features - Good to know - - grown for habit and foliage. Best in parkland or large garden -
Pests & Diseases - aphids, gall wasps, oak wilt, honey fungus, powdery mildew, bracket fungi. -
Place of origin - widely distributed northern hemisphere -
Soil Conditions - Fertile well drained soil -
Quercus - Care Guide
Shrubs and Trees - Seeds - 1) Collecting Seeds
- When is the right time to collect seeds?
- When are seeds actually ripe and ready for collection?
- Magnolia seed collection - Video Tip ondemand_video
- Cornus capitata seed collection - Video Tip ondemand_video
- Rhododendron seed collecting - Video Tip ondemand_video
Shrubs and Trees - Seeds - 2) Storing Seeds
Shrubs and Trees - Seeds - 3) Planting Seeds
Trees - Care Guide
- How to plant a tree - Video Tip ondemand_video
- How to plant a tree
- Checking ties - Video Tip ondemand_video
- Restaking fallen young tree - Video Tip ondemand_video
- Fallen old tree - Video Tip ondemand_video
- Spring pruning - Video Tip ondemand_video
- Removing side shoots - Video Tip ondemand_video
- Deer protection - Video Tip ondemand_video
- Weed Spraying - Video Tip ondemand_video
- Removing Ivy - Video Tip ondemand_video
- Tree Survey - Video Tip ondemand_video
- Crown uplift - Video Tip ondemand_video
- Removing shoots below graft - Video Tip ondemand_video
- Removing peeling bark - Video Tip ondemand_video
- Maintaining variegation - Video Tip ondemand_video
Buy Varieties of QUERCUS
QUERCUS buckleyi >
Commonly known as: Texas red oak.
Noted for its excellent autumn colours this newly introduced species is growing well at Caerhays
QUERCUS dentata 'Carl Ferris Miller' >
Commonly known as: Daimio oak, Daimyo oak.
Stout shoots and very broad, large, ovate leaves. Rare and fairly slow growing.
QUERCUS dentata 'Sir Harold Hillier' >
Commonly known as: Daimio oak, Daimyo oak.
Large green leaves which turn brown in the autumn and hold on the tree all winter
QUERCUS ilex >
Commonly known as: Evergreen oak, Holm oak.
Evergreen oak, excellent for windy or coastal conditions
QUERCUS insignis >
Commonly known as: Oak.
This Mexican species produces its attractive pink secondary new growth in the autumn and therefore needs a very sheltered frost free location to get established
QUERCUS liaotungensis >
Commonly known as: Liaotung oak.
A dense full crowned species from China and Mongolia with leaves which hang on for most of the winter. The acorns are used in the treatment of arthritis
QUERCUS mongolica >
Commonly known as: Mongolian oak.
Leaves borne in dense clusters at the ends of the branches
QUERCUS myrsinifolia >
Commonly known as: Oak.
Small and compact tree with dark green leaves which are paler beneath. Used as a windbreak at Caerhays
QUERCUS phillyreoides >
Commonly known as: Oak.
Rare evergreen oak with oval leathery glossy green leaves and bronze-tinted new growth
QUERCUS pontica >
Commonly known as: Armenian oak, Pontine oak.
An oak with shrubby habit and huge ovate leaves. Good autumn colour
QUERCUS robur 'Concordia' >
Commonly known as: Common oak, English oak, Pedunculate oak.
Golden oak - leaves suffused golden yellow in spring and summer
QUERCUS rubra 'Aurea' >
Commonly known as: Red oak.
Clear golden new leaves which remain yellowish all summer
QUERCUS rhysophylla 'Maya' >
Commonly known as: Loquat-leaf oak.
A hardy Mexican oak with attractive downy reddish new growth maturing to a bullate glossy green
QUERCUS x schuettei 'Silver Shadow' >
Commonly known as: Schuette's oak.
Green leaves which are silvery on the reverse
QUERCUS velutina >
Commonly known as: Black oak, Quercitron oak.
Very large and irreularly lobed leaves. Reddish-brown and yellowish autumn colour
QUERCUS virginiana >
Commonly known as: Southern live oak.
Tall growing species with longitudinally furrowed bark. It keeps its leaves throughout the winter dropping them only when the new growth emerges
