Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust (BBOWT) is offering half-price membership.
The charity, one of 46 Wildlife Trusts working for wildlife across the UK, aims to protect the area's natural beauty.
There are more than 1,700 volunteers working for the charity looking after 85 nature reserves and four education centres.
READ MORE: Berks, Bucks and Oxon Wildlife Trust “delighted” otters are in Oxfordshire
At the moment they are running a wildlife photography competition, and in June they are running a '30 days wild' challenge for participants to 'reconnect with nature'.
They are giving new members a half price rate for one year if they join by May 31.
The amount comes to around £2 a month which goes towards the Wildlife Trust's work.
Last month the trust called on local politicians to sign a pledge to fight to improve people's access to nature.
Nicky Warden, Public Affairs and Planning Officer for BBOWT, said: "The pandemic proved how important spending time in nature is to people’s health and wellbeing - but it also highlighted the inequalities in access to natural green spaces.
"One in three people in England do not have nature near their home, with little or no green space at all in some of the most disadvantaged areas.
"Local councillors have huge power to help us with our mission to restore nature: they decide on planning applications, co-ordinate public transport, create and look after parks and design our town centres."
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