O'Donal's greenhouse

Maine Greenhouse “Best Practices” Workshop – March 20, 2019


O’Donal’s Nurseries, Inc. is a wholesale and retail dealer of plants, trees, shrubs and perennials, and offers landscaping design services. They have a garden center with sunroom. In 1960, Royce and Selma O’Donal  purchased what had been known previously as the Jackson Nursery; a four-generation nursery that originated in 1850. Jeff O’Donal is the second generation owner of this thriving business. In 2018 they built a new geo-thermal greenhouse. Come learn how this family-owned business uses their own set of ‘best practices’ to grow their business, ensure sustainable profitability, produce healthy plants, and safeguard the health of their employees. Tour their new geothermal greenhouse and learn what’s new in biocontrol and plant health. Whether you are a new grower looking to get started, a more experienced grower looking to expand into new crops, or just want to see what’s new, this workshop is for you. Everyone is welcome.
Online registration deadline is March 15, 2019 at 5pm.

Note: If registering more than one person, please register yourself, click Enroll, and then use the “Continue Shopping” option in your cart to add additional participant.

If you need registration assistance, please contact Terri Eldridge at theresa.eldridge@maine.edu or 207.581.3878.

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Program Description


From finding new ways to diversify crops and markets, to managing pests effectively and ensuring worker safety, incorporating best practices helps growers build sustainability and profitability into their greenhouse operations.

7:30:8:00 Check in

8:00 Welcome and Introductions

8:05-9:00 Greenhouse systems: heating, ventilation and more –Jeff Messer and Mark Rawnsley, Griffin Greenhouse Supply

9:00-10:00 Production Practices for Healthy Plants: Matt Wallhead, University of Maine Cooperative Extension

10:00-10:15 Break

10:15-11:15 Biological Control—Ronald Valentin, Director of Technical Business, BioWorks

11:15-12:00 Overview of our Production Practices —Jeff O’Donal, owner, O’Donal’s Nurseries.

12:00-12:45 lunch

12:45-2:45 Tours and hands on activities:

  • Guided tour of greenhouses—Jeff O’Donal
  • Using Biocontrol—Ronald Valentin
  • Plant Disease Diagnosis–Alicyn Smart, University of Maine Cooperative Extension

2:45-3:15 grower to grower discussion and questions for speakers

3:15-3:30 Wrap-up and pesticide credits (4 credits offered).

For more information, please visit Greenhouse Best Practices.

If you are a person with a disability and need an accommodation to participate in this program, please call Terri Eldridge at 207.581.3878 to discuss your needs. Receiving requests for accommodations at least 10 days before the program provides a reasonable amount of time to meet the request, however all requests will be considered. If you have dietary restrictions, please contact Kathy Murray at 207.287.7616 or kathy.murray@maine.gov before the registration deadline.

Program Details


Wednesday, March 20, 2019


7:30 AM – 3:30 PM


O’Donal’s Nursery and Garden Center, 6 County Rd, Gorham, ME

Contact Name

Terri Eldridge, UMaine Extension

Contact Email


Contact Phone



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