The Woodland Trust is offering grants for community tree planting
initiatives. Community groups, associations and not for profit
organisations such as community action groups, local residents groups,
environmental action group, scouts, brownies, etc. can apply for grants
of £100 for tree planting projects organised by the local community. The
grant covers costs directly related to the tree planting project. This
can include purchase of native trees, the purchase of other tree
planting materials and publicity costs. The Woodland Trust Community
Tree Planting Grant is open until the 31st January 2008.

http://www.treeforall.org.uk/GetDigging/Events+grants.htm