Ecologically minded garden design without trees?
I have been reading a lot of books about ecological gardening using native plabts, Doug Tallamys Bringing Nature Home is the prime example, and I want to incorporate these ideas and practices into the gardens at my first house. I bought almost a year ago and did minimal work on the ornamental gardens as I got vegetable beds set to grow. This year I hope to focus more on the other beds, but I am looking for some input. In the reading I have done, it sounds like trees are the most bang for your buck ecologically, supporting wildlife, caterpillars, providing shade ect... but I have a small house on a small lot with over head utilities in most of the areas that are not right up against the house.
So, whats the next best thing to trees? So far, in the little bit I have done, I have plenty of pollinator plants like rudbekia, bee balm, corepsis, a flowering dogwood, two red dogwood shrubs and a handful of blueberry bushes. Where do I go next?