Farhan Ahmed wrote:Correct time would be Spring. (Mar-Apr).
You can try sowing mimosa Post Monsoon also...though season left will be less.
What sowing method & Media are you using?
I sowed the seeds in a small size pot.Put cow dung in it , watered it with spray bottle and kept the pot at place where it get sunlight from 12pm_ 4 pm almost. But the months were of may and june.