1st - May Day
1st-31st Plantlife's 'No Mow May'
1st - 31st Meat-Free May
1st-31st The Tree Council's seasonal 'Walk where you May campaign - Walk Where You May
4th - International Dawn Chorus Day
4th -10th Amphibian Week
4th - 10th International Compost Awareness Week
5th - 7th IUCN WCEL World Environmental Law Congress, Morocco. Theme: 'Integrated Legal Protection of Air, Ocean and Land.'
5th - 9th The 20th Session of the UN Forum on Forests (UNFF 20), New York, USA.
5th - 11th Hedgehog Awareness Week
6th-12th (date tbc) National Hedgerows Week
8th - David Attenborough's 99th birthday!
12th - Full 'Flower' Moon
13th - World Migratory Bird Day
16th -24th Laudato Si Week
16th - Endangered Species Day
20th - World Bee Day
20th - 24th Chelsea Flower Show
22nd - International Day for Biological Diversity
23rd - World Turtle Day
25th - Rogation Sunday
26th - National Garden Wildlife Week (until 1st June)
27th - 8pm BBC 2 Springwatch returns
29th - World Otter Day
29th - Ascension Day
31st - Every Flower Counts, (Plantlife's citizen science survey)