Alex Hyde / Orange-tip butterfly (Anthocharis cardamines) egg and newly-emerged caterpillar on seed pod of Garlic Mustard (Alliaria petiolata). Peak District National Park, Derbyshire, UK. May. Focus stacked imag...

Alex Hyde / Orange-tip Butterfly egg (Anthocharis cardamines) on seed pod of Garlic Mustard (Alliaria petiolata). Peak District National Park, Derbyshire, UK. May. Focus stacked image.

Simon Colmer / Green-veined White butterfly egg (Pieris napi) above, Orange-tip butterfly egg (Anthocharis cardamines) below, on Garlic mustard (Alliaria petiolata) Sussex, UK. June.

Wild Wonders of Europe / Biancar / Snail on Garlic mustard (Alliaria petiolata) leaves, Hallerbos, Belgium, April 2009 WWE OUTDOOR EXHIBITION

Chris Mattison / Orange-tip caterpillar, (Anthocharis cardamines), pupated on Garlic mustard (Alliaria petiolata), one of its foodplants. Wales, UK. June.

Chris Mattison / Orange-tip pupa, (Anthocharis cardamines), having changed colour to match that of its foodplant, Garlic mustard (Alliaria petiolata). Wales, UK. June.

Chris Mattison / Orange-tip caterpillar, (Anthocharis cardamines), on Garlic mustard (Alliaria petiolata), one of its foodplants.

Chris Mattison / Orange-tip caterpillar, (Anthocharis cardamines), recentrly pupated on Garlic mustard (Alliaria petiolata), one of its foodplants. Wales, UK. June.

Chris Mattison / Orange-tip caterpillar, (Anthocharis cardamines), starting to p[upate on Garlic mustard (Alliaria petiolata), one of its foodplants.

Chris Mattison / Orange-tip caterpillar, (Anthocharis cardamines), on Garlic mustard (Alliaria petiolata), one of its foodplants. Wales, UK. June.

Colin Varndell / Garlic mustard (Alliaria petiolata) in flower in spring, Dorset, UK. April.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on secondary host plant Hedge mustard (Alliaria petiolata). Berkshire, England, UK. June.

Kim Taylor / Orange tip Butterfly (Anthocharis cardamines) egg on Garlic Mustard (Alliaria petiolata) flower stalk. Surrey, England, UK, May. Digitally enhanced.

Rod Williams / Garlicmustard (Alliaria petiolata) Brockley Cemetery, Lewisham, London. April.

Will Watson / Large white butterfly (Pieris brassicae) caterpillar on Garlic mustard (Allaria petiolata), Cambridgeshire, England, UK, August.

MYN / Niall Benvie / Orange tip butterfly (Anthocharis cardamines) on Garlic mustard (Alliaria petiolata), Burgundy, France. April.

MYN / Niall Benvie / Orange tip butterfly (Anthocharis cardamines) on Garlic mustard (Alliaria petiolata), Burgundy, France. April.

Alex Hyde / Chrysalis of Orange Tip Butterfly (Anthocharis cardamines) on Garlic Mustard (Alliaria petiolata). The orange wing tips clearly visible through the chrysalis show that this is a male just about to eme...

Alex Hyde / Chrysalis of Orange Tip Butterfly (Anthocharis cardamines) on Garlic Mustard (Alliaria petiolata) against black background in mobile field studio, The orange wing tips clearly visible through the chry...

Alex Hyde / Chrysalis of Orange Tip Butterfly (Anthocharis cardamines) on Garlic Mustard (Alliaria petiolata). The orange wing tips clearly visible through the chrysalis show that this is a male just about to eme...

Simon Colmer / Orange-tip butterfly egg (Anthocharis cardamines) on Garlic mustard (Alliaria petiolata) Sussex, UK. June.

Simon Colmer / Green-veined white butterfly egg (Pieris napi) on Garlic mustard (Alliaria petiolata) Sussex, UK. June.

Russell Cooper / Green-veined White (Pieris napi) butterfly, male feeding from Garlic Mustard (Alliaria petiolata) flowers. South-west London. UK. April.

Andy Sands / Green veined white butterfly (Pieris napi) on Garlic mustard (Alliaria petiolata) by the hedge larval foodplant, UK. April. Captive.

Alex Hyde / Orange tip butterfly (Anthocharis cardamines) chrysalis on Garlic mustard (Alliaria petiolata) Peak District National Park, Derbyshire, UK, August.

Rod Williams / Garlic Mustard (Alliaria petiolata) Ladywell Fields, Lewisham, South East London, England, UK, April

Rod Williams / Garlic Mustard (Alliaria petiolata) Ladywell Fields, Lewisham, South East London, England, UK, April

Alex Hyde / Garlic mustard (Alliaria petiolata) flowers, Peak District National Park, Derbyshire, UK. April.

Alex Hyde / Garlic mustard (Alliaria petiolata) Peak District National Park, Derbyshire, UK. April.

Kim Taylor / Orange-tip Butterfly (Anthocharis cardamines) egg on Garlic Mustard (Alliaria petiolata) about to hatch. Surrey, England, May

Kim Taylor / Orange-tip Butterfly (Anthocharis cardamines) egg on Garlic Mustard (Alliaria petiolata). Surrey, England. May. Digitally enhanced.

Kim Taylor / Orange-tip Butterfly (Anthocharis cardamines) egg on Garlic Mustard (Alliaria petiolata) sequence from new laid to hatch. Read from top left. Surrey, England. Digital composite

Colin Varndell / Garlic mustard (Alliaria petiolata) flowering, Dorset, UK, April

Colin Varndell / Garlic mustard (Alliaria petiolata) in flower, Dorset, UK, April

Nick Upton / Red Campion (Silene dioica) and Garlic mustard / Hedge Garlic / Jack by the hedge (Alliaria petiolata) flowering on a river bank, Wiltshire, UK, April.

Nick Upton / Garlic Mustard / Hedge Garlic / Jack by the Hedge (Alliaria petiolata) flowering on a river bank. Wiltshire, UK, April.

Simon Colmer / Garlic Mustard (Alliaria petiolata) in flower. Primary foodplant of the Green-veined White butterfly (Pieris napi) and Orange-tip butterfly (Anthocharis cardamines) and the secondary foodplant of the...

Simon Colmer / Garlic Mustard (Alliaria petiolata) in flower. Primary foodplant of the Green-veined White butterfly (Pieris napi) and Orange-tip butterfly (Anthocharis cardamines) and the secondary foodplant of the...

Kim Taylor / RF- Orange-tip Butterfly (Anthocharis cardamines) taking off from Garlic Mustard (Alliaria petiolata). Surrey, UK, April. (This image may be licensed either as rights managed or royalty free.)

Kim Taylor / Orange-tip Butterfly (Anthocharis cardamines) alighting on Garlic Mustard (Alliaria petiolata). Surrey, UK, April.

Russell Cooper / Egg of Orange Tip Butterfly (Anthocharis cardamines) on Garlic Mustard (Alliaria petiolata) plant. Morden, South London, England, UK.

Simon Colmer / Orange-tip butterfly larva (Anthocharis cardamines) on garlic mustard (Alliaria petiolata) England, UK

Russell Cooper / Garlic mustard / Jack by the Hedge (Alliaria petiolata) in flower, Morden, South London, UK

Niall Benvie / Garlic mustard {Alliaria petiolata} in flower, Angus, Scotland, UK meetyourneighbours.net project

Ross Hoddinott / Garlic mustard {Alliaria petiolata} Coombe Valley, Cornwall, UK.

John Waters / Hedgerow vegetation dominated by Garlic Mustard, (Alliaria petiolata) Somerset, England, UK Digital Original, Composite

Philippe Clement / Garlic mustard flower {Alliaria petiolata} France

Kim Taylor / Orange tip butterfly (Anthocharis cardamines) egg on Garlic mustard (Alliaria petiolata) Surrey, England