|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
Originating from North America
A grand and impressive oak, forming a typically strong and distinctive branching habit. It bears abundant large leaves similar in appearance to our native oak but 3 or 4 times larger. The red oak is a vigorous species growing at a faster rate than our native robur and produces a lighter and less strong timbers because of this, and is perhaps a little more prone to damage in high winds in exposed positions. It sets acorns readily in the UK and is the best American oak for our climate. In winter its leaves turn a rich dark red before falling.
Thriving in all but shallow chalky soils and best in full sun.
Height and spread after 4 – 5 years 2.5m x 2m
Semi mature height and spread after 10 – 15 years 6m x 4m
Potential mature height and spread after 25 – 30 years 15m x 12m