Rowan / Whitebeam trees

The Rowans or Mountain Ash trees are a group of mostly small trees growing to about 5m-7m, characterised by their heavily segmented or "pinnate" leaves, which often take on attractive autumn colours. They are also known as Mountain Ash trees, because the leaf has a passing resemblance to the common ash - although they are not related.

They are however distantly related to crab-apples and hawthorns, and most varieties bear clusters of fruitlets which hang on the tree into early winter. The fruits are usually red, but there are also yellow and pink varieties. The berries of many species (especially Sorbus aucuparia) can also be cooked and made into rowan jelly, similar to crab-apple jelly.

All forms of rowan are good sources of food for wildlife from late summer into the early winter.

Rowans are easy to grow, and most are tolerant of a wide range of conditions, including acidic soils, clay soils, wet soils, and exposed situations. Many will tolerate chalk, however they prefer well-drained neutral or acidic soils if possible.

Rowans flower very late - in May or June - and often set fruit by mid-summer. This makes them particularly well-adapted to northern climates with short damp summers and cold winters.

Rowans can be grown successfully in areas with long warm summers, provided you pay attention to watering (particularly with young trees) as they do not tolerate drought.

They can be planted in most locations, but for the best fruit and leaf colours plant in full sun.

They are generally healthy trees, although (reflecting their relation with apples) they can be susceptible to fireblight - fortunately not a common disease in the UK. Scab and aphids can also sometimes be a problem.

The growth habit of most varieties is quite upright, making them good street trees.

Most of our Rowan trees are grafted on to Sorbus aucuparia rootstocks, to help give a consistent size and better tolerance to drought. Some are grafted on Sorbus intermedia which is more suitable for the Whitebeam varieties. Although they are usually just planted and allowed to grow naturally, young Sorbus trees can be cut back and shaped and pruned in a similar way to Malus and Prunus.