We had two pretty large Mimosas in our yard when I was a kid. While they provide a nice canopy, ours did not block enough light to stop other yard plants from growing. I've grown them in other places in more recent years, and wish they would grow up in the mountains where I live now. They're beautiful, and do have a delicate scent. I have run across individual trees that had flowers without scent, but only rarely. I think the beauty of the tree is worth the cleanup of flower drop, but that's just me- I love the outdoors, and simple chores are just another way for me to interact with it. I also love another tree which she mentions picking seedlings from her yard- Loquat. It's a great evergreen tree with some of the earliest fruit available in a home setting. I'll be building a greenhouse up here (zone 4) that will be large enough to have a loquat in. Loquats have one to three large seeds in the yellow fruit. The best way to keep from having seedlings popping up in the yard is to clean the fruit from the ground before it rots and drops seed. Better yet, harvest the sweet, delicious fruit for fresh eating or pie baking. ... or send them up here to me!