Mimosa (Albizia julibrissin) is usually grown in the south or the West Coast of the US, but it is actually hardy to USDA Zone 6. Prolonged temperatures close to 0°F will damage the tree, but any dead branches can be pruned back in the spring. Growing the tree in a sheltered spot will help.

Consider carefully, however, before planting this tree. Although mimosa trees have many attractive features and can make an ornamental specimen plant on a lawn, there are a number of  important reasons not to plant it:

• First, it is an invasive species. Silk trees grow vigorously and displace native trees and shrubs, spreading by seed and vegetative means. It is difficult to remove due to the numerous long-lived seeds and its ability to re-sprout vigorously.
• Conversely, your specimen tree will be short-lived, surviving only 10 to 20 years in the Northeast.
• Third, its branches are brittle and it poses a serious litter problem from broken branches, the flowers and seed pods. T
• hey are also allelopathic, meaning that they have a mechanism to prevent other plants from growing near-by.

Mimosas are extremely susceptible to fusarium wilt disease but this is less of a problem in drier, colder regions. There is a cultivar of mimosa known as cold hardy mimosa (Albizia julibrissin 'E. H. Wilson' ) which is hardy to Zone 5. A. julibrissin f. rosea is smaller (15 - 25 ft.) and cold hardy to zone 5b.

Courtesy of NYBG Plant Information