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9 Hastings St
Mendon, MA 01756
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Freshness and Expertise Guaranteed at Mendon Greenhouse & Florist

Welcome to Colleen Oncay’s “labor of love.”

ColleenBelieving good products and services flow from genuine expertise and enthusiasm, Colleen makes sure everyone at Mendon Greenhouse and Florist knows flower arrangements, bouquets, plants, and gardening like the back of their hand. We honestly love what we do, and enjoy helping you choose just the right flowers and table decorations for the love of your life, yourself, or anyone you care about.

We can also help you select just the right landscaping and garden plants, and use all the best gardening techniques and supplies—from tools to soil amendments, and everything in between—to make your patch of land come alive.

Colleen’s special techniques and emphasis on quality allow us to guarantee that Mendon Greenhouse and Florist’s flowers will last at least “One Day Longer™,” and also guarantee our plants, shrubs and trees—better quality and healthier than what you might find elsewhere—will thrive for double the industry standard: two full years guaranteed instead of just one.



We love to help people find the perfect flowers that can be designed into bouquets, centerpieces, and other arrangements for themselves and others for weddings, proms, birthdays, and other gift-giving occasions.

Centerpieces Our flower shop stocks a large variety of fresh-cut flowers from all over the globe (with special emphasis on locally grown), and offers super-easy online ordering.  We also deliver your floral arrangements anywhere – locally or through FTD and 1-800-Flowers.





Every member of the Mendon Greenhouse staff takes pride in offering special care and personal attention to your individual needs, whether you’re celebrating anniversaries or birthdays, planning a beautiful memorial for a departed loved one, or anything else that will benefit from the beauty of flowers.

Colleen and her staff happily meet with wedding couples year round (even on weekends or evenings) to help plan “the big day.” From small backyard ceremonies to events of 500 or more, your gathering will receive personal, immediate attention to every detail. Find out more about Mendon Greenhouse Wedding services here.

The horticulturalists on staff at the Mendon Greenhouse are skilled at understanding garden problems and offering simple, but useful help and guidance on everything from lawn care to vegetable gardening. Our innovative garden center carries proven winners like Espoma, Jonathan Green, and Bonide brand products, to help ensure your success in every part of your yard.





History of Mendon Greenhouse and Florist



…Serving you and your neighbors for more than half a century…

Store PicsMendon Greenhouse & Florist began with Mr. and Mrs. Parkinson, during the 1940s. The Parkinson family lived in the house at 7 Hastings Street and ran a successful dairy operation. However, they also grew carnations and Chrysanthemums in the adjoining field and three greenhouses.

In the 1970s, brothers Dean and Cal Wiegers and their families purchased the house and greenhouses. At the same time, the Ober family purchased the dairy barn and developed it into the Mendon Country Gift Barn.

In 1995, Colleen Oncay and her family (with her father, Craig Wallace) purchased the greenhouse operation from the Wiegers family as a “labor of love,” and set about operating, updating, and expanding it.

After nearly two decades, Colleen is still hard at work in her garden center and flower shop, and still loves it!

GreenhouseOne look around and you’ll see that Mendon Greenhouse and Florist is an intensely personal business. If you ever question any product you’ve purchased here, please let us know. Colleen will work her hardest to make it right for you.

Why not stop by, take a look, and be inspired by the unexpectedly wide variety of floral, landscape, and garden possibilities?

Buy great flowers here.
Buy what you need for your garden here.
Get directions and our hours of operation here.