Importance and benefits of professionally pruning your trees : The WHO and the WHY of professional tree pruning

http://pubs.cas.psu.edu/FreePubs/pdfs/uh099.pdf

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DD Tree & Landscape is Licensed in Rockland, Westchester, Putnam & Yonkers Counties in NYS and in NJ: Rockland License #H-112821-A6-00-00 Westchester License #WC-23810-H11 -Certified New York State -Fertilizer Spray Applicator Yonkers License # 5917 Putnam License # PC7230 New Jersey License #13VH05964000 NJ Business Registration #NJTC768143