Life span:
It may live to 400 years in the wild.
Fruit, seed:
American sweetgum starts to produce fruit at the age of 15 to 20 years. Fruit of American sweetgum consists of 40 to 60 capsules arranged in the form of spiny balls. They are filled with numerous seeds and propagates via seed, stem cuttings and grafting.
Links: https://en.m.wikipedia.org/wiki/Liquidambar_styraciflua
http://www.softschools.com/facts/plants/american_sweetgum_facts/1278/
make by
Iris Deng