October 15-16, 2026
Join us in celebrating a century of excellence and innovation at the ONLA 100th Anniversary Gala Dinner & Greenleaf Nursery Company Open House. Save your spot today!
October 15-16, 2026
Join us in celebrating a century of excellence and innovation at the ONLA 100th Anniversary Gala Dinner & Greenleaf Nursery Company Open House. Save your spot today!
Schedule of Events
Thursday, October 15
ONLA 100th Anniversary Gala Dinner
Greenleaf Nursery Company | Park Hill, Oklahoma
5:30 PM — Arrival & Welcome
Guests arrive and are greeted at the entrance to the nursery grounds. Memory tables featuring photos, programs, awards, and keepsakes from ONLA's 100-year history will be open for browsing as guests arrive.
6:00 PM — Opening Remarks
Randy Davis takes the stage to welcome guests, introduce the evening's program, and acknowledge the significance of ONLA's centennial milestone. A brief look back at 100 years of the Oklahoma green industry.
6:15 PM — Cocktail Hour Begins
The bar opens and passed appetizers begin making their way through the crowd. Live music sets the tone for the evening. Guests are encouraged to explore the gardens — lantern-lit and open for self-guided tours throughout the cocktail hour.
7:15 PM — Guests Are Seated
Dinner service is announced and guests are invited to find their seats. Catered dinner service begins, with live music continuing throughout the meal. Guests enjoy the full spread — entrée, sides, and dessert.
7:30 PM — Centennial Remarks
A formal address honoring ONLA's 100th anniversary. Remarks from Greenleaf leadership and ONLA representatives. An opportunity to recognize the individuals, families, and businesses who have shaped the Oklahoma nursery and landscape industry over the past century.
9:00 PM — Open Evening — Music, Conversation & Garden Tours
The formal program concludes. Guests are free to enjoy the remainder of the evening at their leisure — visit the memory tables, take a tour of the gardens, connect with colleagues, or simply enjoy the music and the company.
Friday, October 16
Greenleaf Nursery Company Open House
Greenleaf Nursery Company | Park Hill, Oklahoma
9:00 AM – Registration Opens
Coffee and morning refreshments will be served as you check in and get your bearings for the day.
9:30 AM – Tours Begin
Two dedicated Greyhound buses will rotate guests through a full program of tours and presentations, including:
A behind-the-scenes look at Greenleaf Nursery’s operations — see firsthand how we produce some of the most in-demand plants in the country.
A meet-and-greet with the breeders behind Garden Debut’s plants — spend time directly with the plant breeders behind Garden Debut's genetics. Ask questions, see material, and make connections you won't find anywhere else.
An exclusive brand presentation from Garden Debut team — an exclusive look at what's coming next from the Garden Debut team.
Raymond Cloyd presentation
1:00 PM – 2:00 PM — BBQ Buffet Lunch
A full southern BBQ buffet will be served under a large tent with tables and seating for all guests. Take a breath, connect with colleagues, and enjoy the afternoon.
2:30 PM — Optional Afternoon Tours (pre-registration required)
After lunch, guests who selected an afternoon tour option will depart for one of two exclusive experiences:
Option A: Tour of Greenleaf's Propagation Facility
Option B: Tour of our Ft. Gibson Bareroot Farm
5:00 PM — Event Wrap-Up
Thank you for spending the day with us. Safe travels home!
Transportation
Transportation will not be provided to and from the nursery for Thursday evening's dinner. Guests are responsible for their own travel to and from the event. We encourage carpooling and recommend arranging accommodations nearby in advance.
Greyhound bus service will be provided for tours throughout the day on Friday. Please note that buses are not provided for travel to or from the nursery — guests are responsible for their own transportation to the event site.
Meet the Breeders Behind the Plants
Matt Dirr
Specializing in abelia, spirea, butterfly bush, and distyliums — carrying on a family tradition of exceptional plant breeding.
Dr. Michael Dirr
A legend in the woody plant world. Dr. Dirr's work spans hydrangeas, abelia, crapemyrtle, distyliums, nandina, and a remarkable breadth of trees and shrubs.
Bill Head
Specializing in mahonia, loropetalum, gardenia, holly, nandina, and blight-resistant boxwood.
Bob Head
Known for magnolias, reblooming azaleas, and blight-resistant boxwood — a true craftsman of Southern landscape plants.
Brent Horvath
Owner of Intrinsic Perennial Gardens and one of the foremost perennial breeders in the country.
Ray & Cindy Jackson
A husband and wife duo whose portfolio spans redbud, persimmons, peach, dogwoods, and much more.
Mitch Magee
The mind behind purple hollies, Oakland Holly, Liberty Holly, Colorama crapemyrtle, and Thunderstruck crapemyrtle.
Loretta Merritt
Award-winning elderberry breeder — a standout in a category with enormous commercial momentum.
Dwayne Moon
Focused on Southern Selection™ urban trees and shrubs suited for today's challenging landscapes.
Frankie Welford
Known for the Golden Hoogendoorn Holly and Dark Roast Heller Holly.
Dr. Carl Whitcomb
A prolific breeder with work in crapemyrtle, waxmyrtle, cherry laurel, althea, and more.
Dow Whiting
Creator of the Princess Series crapemyrtle and many newer dwarf crapemyrtle selections redefining the category.
Keith Westervelt
Focused on redbud, spruce, and oaks — a breeder with deep roots in native and regionally adapted species.
Meet the Breeders Behind the Plants
Matt Dirr
Specializing in abelia, spirea, butterfly bush, and distyliums — carrying on a family tradition of exceptional plant breeding.
Dr. Michael Dirr
A legend in the woody plant world. Dr. Dirr's work spans hydrangeas, abelia, crapemyrtle, distyliums, nandina, and a remarkable breadth of trees and shrubs.
Bill Head
Specializing in mahonia, loropetalum, gardenia, holly, nandina, and blight-resistant boxwood.
Loretta Merritt
Award-winning elderberry breeder — a standout in a category with enormous commercial momentum.
Dwayne Moon
Focused on Southern Selection™ urban trees and shrubs suited for today's challenging landscapes.
Frankie Welford
Known for the Golden Hoogendoorn Holly and Dark Roast Heller Holly.
Dr. Carl Whitcomb
A prolific breeder with work in crapemyrtle, waxmyrtle, cherry laurel, althea, and more.
Dow Whiting
Creator of the Princess Series crapemyrtle and many newer dwarf crapemyrtle selections redefining the category.
Bob Head
Known for magnolias, reblooming azaleas, and blight-resistant boxwood — a true craftsman of Southern landscape plants.
Brent Horvath
Owner of Intrinsic Perennial Gardens and one of the foremost perennial breeders in the country.
Ray & Cindy Jackson
A husband and wife duo whose portfolio spans redbud, persimmons, peach, dogwoods, and much more.
Mitch Magee
The mind behind purple hollies, Oakland Holly, Liberty Holly, Colorama crapemyrtle, and Thunderstruck crapemyrtle.
Keith Westervelt
Focused on redbud, spruce, and oaks — a breeder with deep roots in native and regionally adapted species.
Meet the Breeders Behind the Plants
Matt Dirr
Specializing in abelia, spirea, butterfly bush, and distyliums — carrying on a family tradition of exceptional plant breeding.
Dr. Michael Dirr
A legend in the woody plant world. Dr. Dirr's work spans hydrangeas, abelia, crapemyrtle, distyliums, nandina, and a remarkable breadth of trees and shrubs.
Bill Head
Specializing in mahonia, loropetalum, gardenia, holly, nandina, and blight-resistant boxwood.
Loretta Merritt
Award-winning elderberry breeder — a standout in a category with enormous commercial momentum.
Dwayne Moon
Focused on Southern Selection™ urban trees and shrubs suited for today's challenging landscapes.
Frankie Welford
Known for the Golden Hoogendoorn Holly and Dark Roast Heller Holly.
Dr. Carl Whitcomb
A prolific breeder with work in crapemyrtle, waxmyrtle, cherry laurel, althea, and more.
Dow Whiting
Creator of the Princess Series crapemyrtle and many newer dwarf crapemyrtle selections redefining the category.
Bob Head
Known for magnolias, reblooming azaleas, and blight-resistant boxwood — a true craftsman of Southern landscape plants.
Brent Horvath
Owner of Intrinsic Perennial Gardens and one of the foremost perennial breeders in the country.
Ray & Cindy Jackson
A husband and wife duo whose portfolio spans redbud, persimmons, peach, dogwoods, and much more.
Mitch Magee
The mind behind purple hollies, Oakland Holly, Liberty Holly, Colorama crapemyrtle, and Thunderstruck crapemyrtle.
Keith Westervelt
Focused on redbud, spruce, and oaks — a breeder with deep roots in native and regionally adapted species.
Questions? We're Here to Help.
Contact Colby Davis for questions.
Office: (918) 457-2236
Cell: (918) 457-9987
Greenleaf Nursery Co.
28406 Highway 82,
Park Hill, OK 74451
© 2026 Greenleaf Nursery Company — Park Hill, Oklahoma