Dutch clover and dandelions are the the lawn plants that do the most good for the bees. Flowering trees are the best way to provide bee forage unless you are a farmer. One tree can provide as much forage as an acre of clover.

Linden, crabapple, and red maple are all very productive landscaping trees that produce good forage.

We live out in the country where the landscaping standards are pretty low. There is a little grass around the house that we keep reasonably well trimmed, but the chickens will destroy anything else.