This varies according to the type of palm. They average from 1.67 kN / sq.m, 7.66 kN / sq.m to 15 kN / sq.mPalmettos average 100 lbs per trunk foot, Pindos average 500 lbs per trunk foot, Canary Island Dates average 1000 lbs per trunk foot.Source: http://www.palmtreesltd.com/faqs.html