Here are some local garden and wildlife organisations active in the City of London, and a list of further info sources.
Local Organisations in or near the City of London
Friends of City Gardens Community group and volunteering www.friendsofcitygardens.org.uk
City in Bloom Annual celebration of green spaces in the City of London – with a competition www.cityinbloom.org
Barbican Horticultural Society – for Barbican residents www.barbicanhortsoc.co.uk
Golden Baggers – for Golden Lane Residents www.goldenbaggers.blogspot.co.uk
Barbican Wildlife Garden – located off Fann Street and very active on Twitter at @BarbicanWLG, on Facebook as Barbican Wildlife Garden, and finally their new website address is www.barbicanwildlifegarden.club