All-American Selection
http://www.all-americaselections.org
Abbreviation: AAS

American Takii, Inc.
http://www.takii.com
Abbreviation: TAK

AmeriSeed
http://www.ameriseed.net/

Ball FloraPlant
http://www.ballfloraplant.com
Abbreviation: BFP

Ball Ingenuity
https://www.ballhort.com/Companies/BallIngenuity/
Abbreviation: BI

Ball Seed
https://www.ballseed.com/

Beekenkamp
https://www.beekenkamp.nl/verpakkingen/en/

Blooming' Easy
https://bloomineasyplants.com/

Brushwood Nursery
http://www.gardenvines.com/
Abbreviation: BWN

Burpee Home Gardens
https://www.burpeehomegardensbrand.com/
Abbreviation: BHG

Classic Caladiums
http://www.classiccaladiumsllc.com/
Abbreviation: CC

Danziger
http://www.danziger.co.il
Abbreviation: DZ

Darwin Perennials
http://www.darwinperennials.com/
Abbreviation: DP

David Austin Roses
http://www.davidaustinroses.com/
Abbreviation: DAR

Davis Floral Co.
http://www.davis-floral.com/

Dummen Orange
https://www.dummenorange.com/site/en
Abbreviation: DU

European Takii
https://www.takii.eu/

Evanthia Seeds and Plants
https://www.evanthia.nl/en

Floranova Seeds
http://www.floranova.co.uk
Abbreviation: FL

Garden Choice
https://garden-choice.com/

Green Fuse Botanicals
https://green-fuse.com/site/

Intrinsic Perennial Gardens
http://www.intrinsicperennialgardens.com/
Abbreviation: IPG

J. Berry Nursery
https://www.jberrynursery.com/

James Greenhouses
http://www.jamesgreenhouses.com/
Abbreviation: JGH

Jelitto Seed Co.
http://www.jelitto.com
Abbreviation: JE

Kieft Seeds
http://www.kieft-pro-seeds.com
Abbreviation: KF

Metal Fabricators, Incorporated
http://metalfabricatorsinc.com/
Abbreviation: MFI

Must Have Perennials
http://www.musthaveperennials.com/

North Creek Nurseries
http://www.northcreeknurseries.com
Abbreviation: NC

Oldcastle Lawn and Garden
http://www.myoldcastle.com/Products/Lawn_and_Garden/index.htm
Abbreviation: OLG

PanAmerican Seed Co.
http://www.panamseed.com
Abbreviation: PAS

Plant Delights Nursery, Inc.
http://www.plantdelights.com
Abbreviation: PD

Proven Winners
http://www.provenwinners.com/
Abbreviation: PW

Rijnbeek and Son Perennials
https://www.facebook.com/rijnbeeksperennials/

Selecta
http://firstclassplants.com
Abbreviation: SFC

Skagit Gardens, Inc.
http://www.skagitgardens.com
Abbreviation: SKA

Star Roses
https://www.starrosesandplants.com/

Suntory Flowers
http://suntoryflowers.com/

Syngenta
http://www.syngenta.com/en/index.html
Abbreviation: SYN

Van Belle Nursery
https://vanbelle.com/

Walters Gardens
http://www.waltersgardens.com
Abbreviation: WG

Western Pulp
http://westernpulp.com/
Abbreviation: WP