A series of events in the city’s parks, gardens and open spaces is designed to showcase the work of volunteers and to encourage residents across age groups to make the most of their open spaces.
Other events range from health walks and gardening clubs to pond clearing and after-school play sessions.
Councillor Gill Mitchell, chair of the environment, transport and sustainability committee, joined head gardener George Harris and volunteers at Preston Park Walled Garden last week.
Mitchell said thousands of residents took part in a 'Big Parks Conversation' initiative to gauge views last year with many saying they were interested in volunteering.
Meanwhile seven of the council's green spaces won Green Flags recently. They are Easthill Park, Hove Park, Kipling Gardens, Preston Park, St Ann’s Well Gardens, Stoneham Park and The Level.