Beautiful Albizia Julibrissin trees (also called Mimosa or Silk trees) were grown in Harvard Yard. 
Joe U. took a seed that fell and planted it. The little seed sprouted and grew for a year in the window of his Cambridge home. 
The little Albizia was ready to be transplanted. Follow its journey from Harvard Square to the Boston suburbs.

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   Albizia Tree is boxed and ready to go to suburbs.

 
Albizia Tree waits in car as Joe and Rick go to Celtics game.

 
Rick finds nice spot for Albizia Tree.

Albizia Tree looks good in new spot.

Albizia Tree is growing big!

Albizia Tree is big and even bigger now!!

Albizia Tree sprouts tons of beautiful flowers every year. 
All those beautiful flowers are the talk of the neighborhood!

Hey Rick,
I was gone before your message came through. Your tree must be in full bloom by now. I've found another tree that I like. It caught my eye in the Mt. Auburn Cemetery. The "seven-son flower" tree. Perhaps you know it less well as Heptacodium miconioides? It reminds me a bit of the Albizia julibrissin. It should start flowering in the next week or so. The tree is very slender, with bark that peels off in long strips. The one I've been visiting stands about 35' tall, which is unusually tall from what little I've read. A recent storm knocked a healthy section of branch off. I took some of that home and have a few pieces soaking in water. I'm trying to find out how to start one of my own. I'm not too optimistic I'll get results from a branch resting in water. The tree does not produce convenient seed pods like the Albizia. Here's a link: http://www.coopext.colostate.edu/4DMG/Trees/seven.htm
Joe

Joe, Didn't you get the Albizia tree started from a seed? Rick
Rick,
Yes, I did start those Albizia trees from seeds that fell right from the mother tree. But the Hepta (as in "seven") codium does not produce any seeds, none that I've been able to notice. How does a new tree get started if there are no seeds? Are birds and bees involved? Bats, perhaps?
Inquiring minds,
Joe

Email Joe:  joe@joeu.com
Email Rick: rick@bostonsites.com

Click here to see a smaller version of the Albizia Tree background