Answer: Santa Rosa is somewhat self fertile but will set a better crop with a pollenizer. I am concerned about the winter hardiness of this plum in your area. Santa Rosa is considered hardy to zone 5. Your zip code places you in zone 5A, the coldest part of zone 5. Depending on your microclimate it may be as cold as zone 4. I would suggest you consult with your local county extension and see which varieties of plum they recommend for your local area and growing conditions. They will also be able to tell you if you need to plant a second variety for pollination, and will be able to advise you on a preventive spray program based on disease and pest incidences in your local area. There is some extension information available at their web site, including a list of suggested varieties for New York. You may need to cut and paste the complete url into your browser to make it work correctly.
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