Answer: In my experience it can take several years for a seedling mimosa tree to attain sufficient maturity to begin blooming well. In a cold climate such as yours where the growing season is shorter and the winter cold stress is more severe, it may take a bit longer. I should mention that although mimosas are winter hardy into zone 6, your zip code places you in zone 6A or the coldest part of that zone; depending on your microclimate it may be as cold as zone 5. So this may not be the best choice of tree for you, your local county extension and/or professional nursery staff may be able to help you evaluate the growing conditions where you want to plant it as to what to expect.
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