So you need a small tree. What about a redbud? Trees grow based upon how the soil is amended when planted and the care afterwards.

Here is a link that might be useful: Propagating Perennials

Well, good for you! So I assume you are looking for a fast growing tree.

Pin oak is a good one (Quercus palustris) but it doesn't have noticeable flowers. Redbud is a nice tree, I'd get a cultivar like 'Forest Pansy'. A nice tree that flowers and which birds also like (for wildlife value) is Amelanchier arborea. Kentucky yellowwood (Cladrastis kentukea) is also one to consider. Cornus kousa is a very ornamental flowering tree.

Yet another manifestation of a common landscape design misperception, that large-growing trees will not fit in a small space, in this case, 45' by 60' or more. Please think about this: A low-growing, ornamental tree bears its main crown at the same level as human activity, thereby taking up MORE space where it matters. A big, tall oak, maple elm, whathaveyou, will be, at maturity, a trunk in this same vertical stratum, with its crown overhead, acting as the "ceiling" of your landscape, and like all ceilings, well out of the way of things you want to do.

Don't be offended Jason. I assume you're not a landscape design pro. What does irritate me to no end is the modern tendency of people who ARE pro designers to omit large-scale shade trees from their designs, I'm convinced, because the big circle that represents their crown in plan view 'appears' to take up lots of space. Hence the proliferation of McMansions with the biggest plant material on site being your redbud, flowering crab, hawthorn, etc. Huge, tall houses with no tall-growing trees to match their scale.

+oM

Well it doesn't flower but my front yard has a beautiful Sawtooth Oak tree. It is a rapid growing shade tree and very interesting to look at due to it's unusual leaves. Below is a picture. You might also consider a Tulip (poplar) Tree. They do have flowers and are fast growing shade trees.

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A tulip tree is a fine one, indeed. Fast, straight, and strong.