Leave part of your lawn unmown from about mid May to encourage insect larvae which feed on grass. Allow to seed before cutting, and rake up the hay afterwards. Sow wild flower seed collections in your borders. At woodland edges space and sunshine combine with the trees to give shelter and warmth, and insects will concentrate there. So even in the smallest garden try to have at least one tree or shrub.
Native trees are more attractive to insects than foreign species.
If space is limited, silver birch and goat willow are quick-growing and are host to many insect visitors. With a little more space, try to make a bank of vegetation to give your garden a woodland edge structure. Shelter Belts Rows of bushes or trees can be created or improved, encouraging concentrations of insects and providing a feeding area for bats. Plant up gaps in natural hedges. A row of fast-growing cypress can be valuable.