Cornell Cooperative Extension

Suffolk County
daisy

Perennials are favorites among gardeners.

spotted lantern fly

A Spotted Lanternfly. A new invasive pest on Long Island.

spring blossoms
Image by Mina Vescera, CCE Suffolk County

Magnolia in full bloom in the spring.

Horticulture Factsheets

Our Cornell University research-based Horticulture Fact sheets provide answers to homeowner’s most common questions. Additional information can be obtained by contacting one of the Horticulture Diagnostic Labs by phone or in person.

tomatoes ripening on the vine

Vegetable Gardening

Vegetable gardening Diseases Insects

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Lawn

Lawn Care

Learn about maintaining healthy lawns.

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An apple tree at Wickham’s Fruit Farm in Cutchogue

Growing Tree Fruit

Factsheets on growing tree fruit

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Gold Medal Plant tree 2000

Ornamental factsheets

Factsheets covering trees and shrubs, as well as all other ornamentals in the landscape. Indoor plant care as well.

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digging in the garden with a pitchfork

General Gardening Information

General gardening factsheets including sustainable gardening and IPM

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tick

Indoor/Outdoor Pests

Factsheets covering indoor/outdoor pests, tick biology and control, wildlife and poisonous plants.

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Contact

Alice Raimondo
Horticulture Consultant
aw242@cornell.edu
631-727-4126

Last updated November 17, 2025

Horticulture Factsheets

Open to the Public!

See us in person with your horticulture questions, or deliver us your soil, plant or insect samples. Samples may be also be left in a dropbox at the front door of the Horticulture Diagnostic Labs at 423 Griffing Avenue in Riverhead. Our Bayard Cutting Arboretum, Great River location will be opening for the season Thursdays and Fridays starting April 2026. Date to be announced.

Please be assured staff are working to continue to support all of our residents and businesses.

Horticulture Hotline: 631-727-4126
Monday-Friday 9am-12noon

Contact sib7@cornell.edu or aw242@cornell.edu for further information.