I have planted hundreds of Foster Holly trees. To my knowledge, I have only had two die. I replaced them with new Foster Holly's before the homeowner complained. However, today the homeowner telephoned and said I was an idiot and refund all of their money for the job. She said everyone knows you must plant a female and a male Foster side by side or they will surely die. I have heard this about some plants/trees, but never any type of holly. Does anyone have a definitive answer to this. Also, the builder payed for the landscaping. He also gave me an extra $500.00 to puchase bigger and better plants (bigger/better than normal), and she wants her money back!