Sessile Oak

Description

Sessile oak (Quercus petraea) is a native deciduous tree and a defining feature of natural oak woodlands, particularly across the north and west of the UK. It is closely related to the English oak (Quercus robur), but takes its name from its characteristic acorns, which sit directly on the twig rather than hanging on stalks.

Well adapted to upland climates, poorer soils, and exposed landscapes, sessile oak often forms dense woodland stands and develops a broad, rounded crown with age. Like all oak trees, it supports an exceptional range of insect species, birds, and mammals, making it one of the most valuable trees for biodiversity in Britain.

How to Identify

Sessile oak trees have grey-brown bark that becomes deeply fissured as the tree matures, similar in appearance to English oak. Its leaves are dark green with rounded lobes and are typically narrower than those of the common oak.

In spring, flowers appear as subtle catkins. The easiest way to distinguish sessile oak from English oak is by the acorns. Sessile oak acorns are attached directly to the twig without stalks, while English oak acorns hang on long stems.

How to Grow

Quercus petraea grows best in well-drained soils, including lighter or more acidic soils, and is well-suited to woodland planting, informal gardens, and exposed or coastal sites. It tolerates partial shade when young but performs best in full light as it matures.

Once established, this long-lived woodland tree requires very little intervention and copes well with the UK’s varied climate conditions.