Loic Poidevin / Lotus (Nelumbo nucifera) in flower in botanic garden, Vendee, France, July.

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Pascal Pittorino / Horned pansy (Viola cornuta) in botanic garden, Var, France, March.

Andrew Walmsley / Silver eye / Grey backed white eye (Zosterops lateralis) in flowering Pohutukawa tree (Metrosideros excelsa) Botanic Gardens, Christchurch, South Island, New Zealand, December

Heather Angel / Red wattlebird (Anthochaera carunculata) feeding on nectar of flame grevillea (Grevillea excelsior) Kings Park, Western Australia Botanic garden, Western Australia.

Heather Angel / Painted lady butterflies (Vanessa cardui), three nectaring on potted Chrysanthemums (Chrysanthemum sp) in evening light. Urumqi Botanic Garden, Wushi, Xinjiang Uygur Autonomous Region, China. Septembe...

Heather Angel / Red wattlebird (Anthochaera carunculata) nectaring on Fuschia grevillea (Grevillea bipinnatifida). Western Australia Botanic Garden, Kings Park, Perth,

Heather Angel / Red wattlebird (Anthochaera carunculata) nectaring on Grevillea (Grevillea preissii). Western Australia Botanic Garden, Kings Park, Perth, Australia. November.

Heather Angel / Ant (Formicidae) nectaring on Geraldton waxflower (Chamelaucium uncinatum). Western Australia Botanic Garden, Kings Park, Perth, Australia. November.

Heather Angel / Carpenter bee (Xylocopa caffra) male piercing corolla to rob nectar from Ninepin heath (Erica mammosa), failing to pollinate flower. Harold Porter Botanic Garden, Cape Fynbos, South Africa. February.

Heather Angel / Orange breasted sunbird (Anthobaphes violacea), male nectaring on Heather (Erica sp). Kirstenbosch Botanic Garden, Cape Town, South Africa. February

Heather Angel / False tiger moth (Dysphania militaris) nectaring on Crapnell's camellia (Camellia crapnelliana). Hong Kong Botanic garden, Hong-Kong.

Loic Poidevin / Lotus (Nelumbo nucifera) in flower in botanic garden, Vendee, France, July.

Adrian Davies / Pasque flower (Pulsatilla ambigua), cultivated in a botanic garden, Surrey, England, UK. Native to Asia.

Adrian Davies / Pitcher plant (Nepenthes robcantleyi), cultivated specimen in botanic garden, Surrey, England, UK. Native to the Philippines.

Ernie Janes / Magpie-lark (Grallina cyanoleuca) Melbourne Botanic Garden, Victoria, Australia.

Ernie Janes / Magpie-lark (Grallina cyanoleuca) Melbourne Botanic Garden, Victoria, Australia.

Ernie Janes / Indian lotus (Nelumbo nucifera) flowers, Melbourne Botanic garden, Victoria, Australia.

Ernie Janes / Indian lotus (Nelumbo nucifera) close up of flower, Melbourne Botanic garden, Victoria, Australia.

Ernie Janes / Indian lotus (Nelumbo nucifera) close up of flower, Melbourne Botanic garden, Victoria, Australia.

Adrian Davies / Ylang ylang (Cananga odorata) growing in botanic garden, Surrey, UK.

Edwin Giesbers / Longevity spinach (Gynura procumbens) close up of leaf, Botanic Garden Meise, Belgium.

Edwin Giesbers / Indian lotus (Nelumbo nucifera) seed pod, Botanic Garden Meise, Belgium.

Edwin Giesbers / Indian lotus (Nelumbo nucifera) flower, Botanic Garden Meise, Belgium.

Edwin Giesbers / Utrecht University Botanic Gardens, the Netherlands, May 2013.

Edwin Giesbers / Orchid (Coelogyne swaniana) with botanist in the background, Botanic Garden Leiden, the Netherlands. September 2013.

Edwin Giesbers / Orchid (Bulbophyllum lobii) with botanist in the background, Botanic Garden Leiden, the Netherlands. September 2013.

Edwin Giesbers / Seed collection, Botanic Garden Amsterdam, the Netherlands, August.

Edwin Giesbers / Bromeliads growing in greenhouse, Botanic Garden Amsterdam, the Netherlands, August.

Edwin Giesbers / View out to river from greenhouse of Botanic Garden Amsterdam, the Netherlands, August 2013.

Edwin Giesbers / Indian pokeweed (Phytolacca acinosa) occurs in Asia. Botanic Garden Amsterdam, the Netherlands, August 2013.

Edwin Giesbers / Kalachoe (Kalanchoe daigremontiana) flower. Endemic to Madagascar. Botanic Garden Amsterdam, the Netherlands.

Edwin Giesbers / Succulent (Euphorbia ferox) occurs in South Africa. Botanic Garden Amsterdam, the Netherlands, August 2013.

Edwin Giesbers / White velvet tradescantia (Tradescantia sillamontana) occurs in Mexico. Botanic Garden Amsterdam, the Netherlands, August 2013.

Edwin Giesbers / Close up of Madagascar ocotillo (Alluaudia procera) stalk, leaves and spines, endemic plant to Madagascar. Botanic Garden Amsterdam, the Netherlands, August 2013

Edwin Giesbers / Close up of Agave leaves (Agave potatorum) endemic to Mexico. Botanic Garden Amsterdam, the Netherlands, August 2013.

Edwin Giesbers / Arayat pitogo (Cycas riuminiana) occurs in Philippines. Botanic Garden Amsterdam, the Netherlands, August 2013. Endangered species.

Edwin Giesbers / Agave (Agave felgeri) leaves, close up. Endemic plant to Mexico. Meise National Botanic Garden of Belgium, Belgium, August.

Edwin Giesbers / Century plant (Agave americana) leaves close up. Occurs in Mexico and Southern USA. Meise National Botanic Garden of Belgium, Belgium, August.

Edwin Giesbers / Ethiopian banana plant (Ensete ventricosum) close up of leaf. Occurs in Africa. Meise National Botanic Garden of Belgium, August.

Edwin Giesbers / Blue waterlily (Nymphaea caerulea) flower. Occurs in Africa and Asia .Botanic Garden Meise, Belgium, August.

Edwin Giesbers / Interior of Balatkas Greenhouse, Botanic Garden Meise, Belgium, Augus 2013.

Edwin Giesbers / Interior of Balatkas Greenhouse, Botanic Garden Meise, Belgium, Augus 2013.

Edwin Giesbers / Exterior of Balatkas Greenhouse, Botanic Garden Meise, Belgium, August 2013.

Edwin Giesbers / Castle Bouchout at Botanic Garden Meise, Belgium, August 2013.

Edwin Giesbers / Interior of greenhouse at Botanic Garden Meise, Belgium, August 2013.

Edwin Giesbers / Giant water lily (Victoria amazonica) and Pitcher plants (Nephenthes) in greenhouse, Botanic Garden Meise, Belgium, August 2013.

Edwin Giesbers / Variety of Lily pads of different size and colour, Botanic Garden Meise, Belgium, Augus 2013.

Edwin Giesbers / Water lily pond, including Giant waterlily (Victoria amazonica) in greenhouse in Botanic Garden Meise, Belgium.

Edwin Giesbers / Canal outside Botanic Garden Leiden, Netherlands, July 2013.

Edwin Giesbers / Orchid (Bulbophyllum sp) flower, Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Orchid (Bulbophyllum sp) Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Orchid (Bulbophyllum sp) on white background, Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Orchid (Bulbophyllum sp) Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Orchid (Chelonistele maximae-reginae) flowers, Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Close up of Sundew (Drosera binata extrema), occurs in Australia and New Zealand. Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Close up of Sundew (Drosera binata extrema), occurs in Australia and New Zealand. Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Close up of Sundew (Drosera binata), occurs in Australia and New Zealand. Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Carnivorous plant (Roridula gorgonias) occurs in Australia and New Zealand. Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Crimson pitcherplant (Sarracenia leucophylla) endemic to the Southeastern United States. Botanic Garden Leiden, Netherlands, July. Vulnerable species.

Edwin Giesbers / Botanist working with orchids in greenhouse, Botanic Garden Leiden, Netherlands, July.

Edwin Giesbers / Botanic Garden Leiden, Leiden, Netherlands, July 2013.

Edwin Giesbers / Interior of greenhouse at Botanic Garden Leiden, Netherlands, August.

Edwin Giesbers / Interior of greenhouse and tropical plants wth leaves of different size and shape, Botanic Garden Leiden, Netherlands, August.

Edwin Giesbers / Statue in Botanic Garden Leiden, Netherlands, August.

Edwin Giesbers / Collection of Cacti (Cactaceae) in greenhouse at TU Delft Botanical Garden, Netherlands, August.

Edwin Giesbers / Cappadocian navelwort (Omphalodes cappadocica) native to Turkey and the Caucasus. Utrecht University Botanic Garden, the Netherlands, May.

Adrian Davies / Voodoo lily (Amorphophallus bulbifer) flower in botanic garden, Surrey, England, UK, May.

Adrian Davies / Voodoo lily (Amorphophallus bulbifer) flower in botanic garden, Surrey, England

Juan Carlos Munoz / Arborescent ferns (Cyatheaceae) in Kells Bay Gardens, Ring of Kerry, Iveragh Peninsula, County Kerry, Republic of Ireland. September 2015.

Paul D Stewart / Historical illustration of Mandrake (Mandragora officinarum) flowers and fruits from the Paris Royal Botanic Garden. Engraving by Stumpf, in 'Dictionarium, Historicum, Criticum, Chronologicum, Geograp...

Pascal Pittorino / Icce Poppy flower (Papaver croceum) in botanic garden. Toulon, Var, Provence, France, November

Pascal Pittorino / Silk Floss tree flower and fruit (Ceiba speciosa) against a blue sky in botanic garden, Hyeres les palmiers, Var, Provence, France, November

Pascal Pittorino / Silk Floss tree flowers and fruits (Ceiba speciosa) against a blue sky in botanic garden, Hyeres les palmiers, Var, Provence, France, November

Ann & Steve Toon / Pincushion protea (Leucospermum cordifolium), Kirstenbosch Botanical Gardens, Cape Town, South Africa

Adrian Davies / Ethiopian Banana (Ensete ventricosum) close up detail of leaf taken in Botanic garden, Surrey UK

Niall Benvie / Giant sequoia trees (Sequoiadendron giganteum) part of the The Ben More Redwoods, Benmore Botanic Garden, Scotland, UK, July.

Niall Benvie / Giant sequoia trees (Sequoiadendron giganteum) part of the The Ben More Redwoods, Benmore Botanic Garden, Scotland, UK, July.

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower. Cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower. Cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Michael Hutchinson / Visitor taking photograph of Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the large...

Michael Hutchinson / Spadix of Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flowe...

Michael Hutchinson / Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the largest unbranched flower inflores...

Michael Hutchinson / Visitors to Kew Gardens looking at Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the...

Michael Hutchinson / Visitors to Kew Gardens looking at Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the...

Michael Hutchinson / Visitors to Kew Gardens looking at Titan arum (Amorphophallus titanum), in flower, cultivated specimen in botanic garden, native to Sumatra. Kew Gardens, London, UK. 23 April 2016 This species has the...