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