While conditions vary from state-to-state -- sometimes making what works well in one inadvisable in another -- many other land grant universities have excellent online information that can be adapted to New York conditions. If you're in doubt, contact your local office of Cornell Cooperative Extension.
Ohio State Yard and Garden Online Factsheets - Topics on trees, shrubs, groundcovers, flowers, fruit, vegetables, lawns, insects & pests, landscaping, specialty gardens, weed control, soil management, nursery, landscape and turf image library, factsheet series, etc. OSU's PlantFacts site also features databases of factsheets, videos, plants.
University of Maryland Home and Garden Information Center - Includes plant diagnostic website and Northeast gardener 'Q & A hotline'
Purdue University, Consumer Horticulture - A wide variety of information of interest to the home gardener, including the virtual plant and disease diagnostic laboratory.
Missouri Extension Service Horticulture Publications - Factsheets on fruits, vegetables, flowers, houseplants, lawns, trees, shrubs, landscaping, weed control, garden soils, propagation.
Michigan State University's Master Gardener Page - Many useful links.
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