Soak seed in water for 24 hours. Then lightly cover the seed soil temp 65-70F & takes 21-35 days to germinate. will look like parent but cold hardeniss may vary (+ or -)
May take cuttings now or spring apply 0.4 to 0.8% IBA (Rooting hormone) stick in well drained soil & mist. Bottom heat helpful taking 25-80 days to root.

Mimosas are very easy to root from cuttings. Wait until spring and take a 24 inch cutting just at leaves start to sprout. Put it in damp sand and in light shade. Keep the soil moist. Use your favorite rooting compound. Or layer a limb.

I cut a 12 in branch from one side of my mimosa tree and then cut that piece into three smaller branches and placed them in a glass pitcher , I didn’t really know what I was doing but to my surprise , they started growing . They have some roots at the bottom and the branches have growth all over . I don’t know when I should transfer to s pot ?