Robert Thompson / Hawthorn berries (Crataegus monogyna) Brackagh Moss NNR, Portadown, Co. Armagh, Northern Ireland.

Andres M. Dominguez / Hawthorn berries (Crataegus monogyna) in Poplar woodland (Populus) Sierra de Grazalema Natural Park, southern Spain. October.

Mike Read / Common reed bunting (Emberiza schoeniclus) female perched in Hawthorn (Crataegus monogyna) Blashford Lakes Nature Reserve, Hampshire and Isle of Wight Wildlife Trust Reserve, Ellingham, near Ringwood,...

Alan Williams / Hawthorn (Crataegus monogyna) blossoming in carpet of Bluebell (Hyacinthoides non-scripta), hills in background, Aber Valley, Gwynedd, Wales, UK. May 2019.

Nigel Cattlin / Figure of eight moth (Diloba caerouleocephala) caterpillar on Hawthorn (Crataegus monogyna). England, UK.

Graham Eaton / Hawthorn (Crataegus monogyna) tree growing out of joints in carboniferous limestone, Ingleton, Yorkshire, January 2017. The tree has exploited a water enlarged joint or gryke in the limestone pavement...

Paul Hobson / Brown hairstreak (Thecla betulae) resting on Hawthorn (Crataegus monogyna). Lincolnshire, England, UK. July.

Paul Hobson / Yellow bunting (Emberiza citrinella) male singing, perched in Hawthorn (Crataegus monogyna) tree. Sheffield, England, UK. April.

Andy Sands / Girl smelling Hawthorn (Crataegus monogyna) blossom Hertfordshire, England, UK, May

David Woodfall / Hawthorn (Crataegus monogyna) growing on former colliery mining spoil, Dare Valley Country Park, Rhondda Cynon Taf, Wales, UK, May.

Colin Varndell / Hawthorn (Crataegus monogyna) berries ripening on tree. Dorset, UK September 2016

Ashley Cooper / Hawthorn tree (Crataegus monogyna) bent over by the prevailing wind on Humphrey Head Point above Morecambe Bay near Grange over Sands, England, UK. November 2006

Ashley Cooper / Hawthorn trees (Crataegus monogyna) bent over by the prevailing wind on Humphrey Head Point above Morecambe Bay , Grange over Sands, England, UK. November 2006

Nick Upton / Hawthorn blossom (Crataegus monogyna), Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), Wiltshire, UK, May.

Ernie Janes / Ivy (Hedra helix) in flower growing around Hawthorn (Crataegus monogyna) bush in hedgerow. Norfolk, England, UK. September.

Ernie Janes / Blackthorn (Prunus spinosa) sloes and Hawthorn berries (Crataegus monogyna) Norfolk, England, UK, August.

Ernie Janes / Blackthorn (Prunus spinosa) sloes and Hawthorn berries (Crataegus monogyna) Norfolk, England, UK, August.

Robert Thompson / Puss moth (Cerura vinula) camouflaged on small Hawthorn tree (Crataegus monogyna) Burren National Park, County Clare, Ireland, April.

Mike Read / Common linnet (Carduelis cannabina) pair perched in Hawthorn (Crataegus monogyna) Broughton Down Hampshire and Isle of Wight Wildlife Trust Reserve, Broughton, Hampshire. England, UK August.

Dave Bevan / Pair of Wood pigeons (Columba palumbus) perched in a Hawthorn tree (Crataegus monogyna), exchanging food, Gloucestershire, England, UK, June.

John Waters / Tracking timelapse of Common hawthorn trees (Crataegus monogyna), Dartmoor National Park, Devon, England, UK, September 2012.

John Waters / Hawthorn tree (Crataegus monogyna) shaped by the prevailing wind, growing in sheep pasture near Oxwich Point, Gower peninsula, Wales, UK, October.

Fabrice Cahez / Hawthorn (Crataegus monogyna) berries covered in frost, Vosges, France, January.

Fabrice Cahez / Hawthorn (Crataegus monogyna) berries covered in frost, Vosges, France, January.

Terry Whittaker / Hawthorn tree (Crataegus monogyna) on cliff top shaped by prevailing wind. Dover Cliffs, Kent, UK. July

Stephen Dalton / Hawthorn tree (Crataegus monogyna) in full leaf in spring, Sussex, UK May

Mike Read / Hawthorn (Crataegus monogyna) two leaves on lightbox Ringwood Hampshire UK October

Mike Read / Hawthorn (Crataegus monogyna) individual leaf on lightbox Ringwood Hampshire UK October

Will Watson / Mistletoe (Viscum album) berries, growing on Hawthorn (Crataegus monogyna), Worcestershire, England, UK, April.

Colin Varndell / Hawthorn blossom (Crataegus monogyna) Dorset, May.

Fabrice Cahez / Hawthorn (Crataegus monogyna) flowers, Vosges, France, May.

Fabrice Cahez / Hawthorn trees (Crataegus monogyna) in flower in field with cattle, Vosges, France, May.

Alex Hyde / Hawthorn (Crataegus monogyna) flowers, Peak District National Park, Derbyshire, UK. May.

Alex Hyde / Hawthorn Shieldbug (Acanthosoma haemorrhoidale) on Hawthorn (Crataegus monogyna), Peak District National Park, Derbyshire, UK. May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, in a hedgerow bordering pastureland, Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, Wiltshire, UK, May.

Nick Upton / Hawthorn blossom (Crataegus monogyna), pink form, Wiltshire, UK, May.

Mike Wilkes / Robin (Erithacus rubecula) perched on Hawthorn (Crataegus monogyna) Warwickshire, UK, January.

Ross Hoddinott / Close up of Hawthorn (Crataegus monogyna) flowers, Cornwall, UK. May 2013.

Chris Mattison / Hawthorn (Crataegus monogyna) growing on limestone pavement, stunted by continual cropping by sheep, Lancashire, UK. May.

Colin Varndell / Blackthorn (Prunus spinosa) sloes and Hawthorn berries (Crataegus monogyna) ripening in tangled hedgerow, Dorset. September.

David Woodfall / Landscape with Hawthorn trees (Craetegus monogyna) looking north-west from Burrowbridge during January 2014 floods, in Somerset levels, England, UK, 11th January 2014.

David Woodfall / View looking south from Burrowbridge over flooded Hawthorn (Crataegus monogyna) trees during January 2014 floods, Somerset Levels, England, UK, 11th January 2014.

David Woodfall / View looking east from Burrowbridge over flooded Hawthorn (Crataegus monogyna) trees during January 2014 floods, Somerset Levels, England, UK, 11th January 2014.

Chris Mattison / Common orange lichen (Xanthoria parietina) on Hawthorn twig (Crataegus monogyna) together with a Shield lichen (Parmelia sulcata) England, UK. April.

Chris Mattison / Single hawthorn (Crataegus monogyna) tree on hillside, Deep Dale, Derbyshire, England, UK, May 2013.

Chris Mattison / Single hawthorn (Crataegus monogyna) tree on hillside, Deep Dale, Derbyshire, England, UK, May 2013.

Fergus Gill / Tree sparrow (Passer montanus) perched on a branch of Hawthorn blossom (Crataegus monogyna) Perthshire, Scotland. June 2013

Fergus Gill / Tree sparrow (Passer montanus) perched on a branch of Hawthorn blossom (Crataegus monogyna) Perthshire, Scotland. June 2013

Fergus Gill / Yellowhammer (Emberiza citrinella) perched on a branch of Hawthorn blossom (Crataegus monogyna) Perthshire, Scotland. June 2013

Fergus Gill / Tree sparrow (Passer montanus) feeding a fledgling on a branch of Hawthorn (Crataegus monogyna) blossom, Perthshire, Scotland. June 2013

Fergus Gill / Tree Sparrow (Passer montanus) fledgling. Perched on a branch of Hawthorn (Crataegus monogyna) blossom. Perthshire, Scotland. June 2013

Fergus Gill / House Sparrow (Passer domesticus) (left) and Tree sparrow (Passer montanus) (right) perching on a branch of Hawthorn (Crataegus monogyna) blossom. Perthshire, Scotland. June 2013

Fergus Gill / Tree Sparrow (Passer Montanus) juvenile, perched on a branch of Hawthorn blossom. Perthshire, Scotland. June.

Fergus Gill / Tree Sparrow (Passer montanus) perching on a branch of Hawthorn blossom. Perthshire, Scotland. June.

Ross Hoddinott / 2020VISION / Monochrome image of a Hawthorn tree (Crataegus monogyna) and granite outcrop near Saddle Tor, Dartmoor National Park, Devon, England, UK, January 2011.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves and petioles and stems of hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustule swelling on the stem and spike of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules lesion and aecial horns forming on upper leaf of Hawthorn (Crataegus monogyna), Berkshhire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on flower and peduncle of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Will Watson / Hawthorn (Crataegus monogyna) leaf buds opening, Herefordshire, England, UK, April. Focus stacked under controlled conditions.

Will Watson / Hawthorn (Crataegus monogyna) in blossom, Afon Senni valley, Brecon Beacons National Park, Powys, Wales, UK. April.

Will Watson / Hawthorn (Crataegus monogyna) in blossom, Afon Senni valley, Brecon Beacons National Park, Powys, Wales, UK. April.

Will Watson / Hawthorns (Crataegus monogyna) in blossom, Afon Senni valley, Brecon Beacons National Park, Powys, Wales, UK. April.

Will Watson / Hawthorns (Crataegus monogyna) in blossom, Afon Senni valley, Brecon Beacons National Park, Powys, Wales, UK. April.

Brian Bevan / Common cuckoo (Cuculus canorus) male perched in Hawthorn bush (Crataegus monogyna) on windy day, Bedfordshire, UK.

Brian Bevan / Common cuckoo (Cuculus canorus) male perching in Hawthorn bush (Crataegus monogyna) and looking around before taking flight, Bedfordshire, UK.

Brian Bevan / Common cuckoo (Cuculus Canorus) male perched in Hawthorn bush (Crataegus monogyna) on windy day, Bedfordshire, UK.

Mike Read / Two people walking down overgrown footpath. Martin Down National Nature Reserve, Hampshire, UK. May.

Chris Mattison / Hawthorn tree (Crataegus monogyna) in flower, growing on banks of River Bela, with sheep grazing in background. Cumbria, UK. May.

Nick Upton / Social pear sawfly (Neurotoma saltuum) (Pamphiliidae) larvae feeding within silk tent on Hawthorn leaves (Crataegus monogyna) in woodland, near Trowbridge, Wiltshire, UK, June.

Nick Upton / Buff-tailed bumblebee (Bombus terrestris) nectaring on Hawthorn (Crataegus monogyna) blossom, Kenfig National Nature Reserve, Glamorgan, Wales, UK, May.

Linda Pitkin / Common hawthorn (Crataegus monogyna) berries, Selsdon Wood Nature Reserve, Surrey, England. October.

Linda Pitkin / Watercolour painting of Common hawthorn (Crataegus monogyna) berries. Botanical illustration by Linda Pitkin.

Linda Pitkin / Common hawthorn (Crataegus monogyna) berries, Selsdon Wood Nature Reserve, Surrey, England. October.

Guy Edwardes / Hawthorn (Crataegus monogyna) tree shaped by the prevailing wind, at sunset, The Black Mountains, Brecon Beacons National Park, Wales, UK. August.

Guy Edwardes / Hawthorn (Crataegus monogyna) tree shaped by the prevailing wind, at sunset, The Black Mountains, Brecon Beacons National Park, Wales, UK. August.

Will Watson / Different types of hedgerows in winter: low cut; low cut with oak (Quercus robur) trees and a gappy hedge with mature Hawthorns (Crataegus monogyna) and oaks, viewed from Bradnor Hill, Herefordshire,...

Will Watson / Hawthorn (Crataegus monogyna), Ash (Fraxinus excelsior) and Cow parsley (Anthriscus sylvestris), Bridleway, Harley Mountain, Herefordshire, England, UK. June, 2021. June.

Chris Mattison / Hawthorn (Crataegus monogyna) growing from limestone outcrop, Cressbrook Dale, Derbyshire, UK. May, 2010.

Colin Varndell / Common hawthorn (Crataegus monogyna) flowers in May blossom. Dorset, UK, May.

Will Watson / Ancient hawthorn (Crataegus monogyna) with berries and stripped of leaves, Hergest Ridge looking across to Herrock Hill, Herefordshire / Radnorshire border, UK. October,

Nick Upton / Old man's beard, the seedheads of Wild clematis (Clematis vitalba) and Hawthorn (Crataegus monogyna) berries in a hedgerow, Wiltshire, UK, September.

Linda Pitkin / Autumn leaves including Sweet gum (Liquidambar styraciflua); Hawthorn (Crataegus monogyna); Tutsan (Hypericum androsaemum); Norway maple (Acer platanoides); Prunus sp and Strawberry tree (Arbutus uned...

Philippe Clement / Blossoming common hawthorn / oneseed hawthorn / single-seeded hawthorn / mayblossom (Crataegus monogyna) showing white flowers in spring, Belgium. April

Philippe Clement / Blossoming common hawthorn / oneseed hawthorn / single-seeded hawthorn / mayblossom (Crataegus monogyna) showing white flowers in spring, Belgium. April

Nigel Cattlin / May or hawthorn blossom (Crataegus monogyna) white flowers on a small fragrant tree typical of spring, Berkshire, England, UK, May

Nigel Cattlin / May or hawthorn blossom (Crataegus monogyna) white flowers on a small fragrant tree typical of spring, Berkshire, England, UK, May

Nigel Cattlin / May / Hawthorn blossom (Crataegus monogyna) buds white flowers on a small fragrant tree typical of spring, Berkshire, England, UK, April

Colin Varndell / Ripe Hawthorn berries (Crataegus monogyna) in autumn, Dorset, UK. October.