Holly

English, European or common holly (Ilex aquifolium) is an evergreen that’s prevalent locally, in the UK and beyond. Native to most of Western Europe, it has proliferated in parts of North America including Canada, Hawaii and the west coast, where it’s now considered invasive.

Holly is a highly resilient species, tolerating frost and seasonal drought with relative ease. It’s adaptable too, thriving in shade but quick to populate new habitat as a pioneer species. Because this species thrives in shade, it’s commonly found with oak and beech, sometimes even taking over the area as the dominant species.

Once established, holly can live for up to 300 years and reach over 15m in height.

Few species are more recognisable than holly, thanks to its shiny, hard, dark green leaves with sharp prickles and its bright (female) scarlet berries that mature in autumn and stick around for winter. Other features include a thin, smooth, light brown-grey bark and four-petalled white flowers that bloom in spring.

Unlike some other species, holly has separate male and female trees, making it dioecious. All species of Ilex (holly) are dioecious, meaning male and female plants are separate. Examples of the opposite (monoecious trees) include birch, chestnut and walnut.

Holly is great for wildlife, providing food and habitat for birds and small mammals including dormice and hedgehogs. Its heavy white wood is good for making furniture or burning as firewood and its foliage is common in Christmas decorations.

Phytophthora ilicis, better known as holly leaf blight, is a common threat leading to dieback – a pathogen that causes branches, twigs and roots to die.

Images: tree by Bob Harvey, CC BY-SA 2.0; buds by Sarah Adamson CC0 (iNaturalist); female flower by kenny_well (iNaturalist); leaves by Hans (Pixabay); fruit by dendoktor (Pixabay)

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