Here is complete guide about Mimosa Tree found in the book called “TREE AND SHRUB GARDENING FOR NORTHERN CALIFORNIA” by “Bob Tanem” and “Don Williamson”,here is an excerpt from the book
Features: flowers, foliage, habit Habit: deciduous to semi-evergreen tree with rounded to irregular crown Height: 25-40’ Spread: 15-30’ Planting: container; spring, after all risk of frost has passed Zones: 9-11
MIMOSA TREE IS OFTEN CONFUSED WITH BAILEY ACACIA BECAUSE their fern-like foliage is similar. When the trees are in flower, however, mimosa tree’s bluish purple blooms are easily distinguished from the yellow acacia flowers. Mimosa tree can survive frost providing it has matured. The specimen in Courthouse Square in San Rafael is a great example- it has survived through several Alaskan-type winters. Because hard frosts (below 15° F) happen so rarely in Northern California, this tree can become a showpiece for many coastal as well Bayside gardens.
Mimosa tree thrives in full sun in well-drained, moderate to fertile soil, though it will tolerate heavy clay soil. It has a low tolerance to salt. Ensure moderate water during the growing season. Trees in coastal areas may not produce flowers because of low summertime temperatures.
Young plants are frost tender and should be protected the first couple of winters. Older trees can be damaged when temperatures reach 15° F or lower. Most will come back from the root, but they will have to be retrained to take tree form.
Mimosa tree needs only minimal pruning. Remove any wayward branches, cutting back to the branch’s point of origin. When a mimosa tree is planted as a street tree, remove the lower branches to allow enough room under the crown for cars to pass. Prune in mid-to late winter before new growth begins.
Mimosa tree is used as a street tree, a shade tree and a specimen tree. Its roots are well behaved, so it can also make an interesting patio tree. It is a great tree when allowed the space to fully mature.
Mimosa tree is normally evergreen in mild climates, but it drops its leaves where winter temperatures drop below 25° F. The seedpods are ornamental and can be used as accents in flower arrangements.
Mimosa tree has a shallow root system that makes underplanting difficult. Try an organic mulch out to the dripline.
J.mimosifolia has fern-like, bright green foliage that drops in late winter. Large clusters of fragrant, bluish purple, trumpet-shaped flowers are produced in mid-to late spring at the tips of the light gray branches. There may be occasional blooming through summer. The flowers are followed by leathery, flat, disk-like seedpods. (Zones 9-11)
Problems & Pests
Aphids may be a problem, and mimosa tree can also experience crown gall, leaf spot and root rot where drainage is poor. It is resistant to oak root fungus.