Only one 'Courtney' exists in databases: a 1922 hybrid tea by McGredy. Unlikely still in commerce. Contact McGredy Roses International in Auckland, NZ—they may have it or know a source.
Finding a Replacement for Terosa Organic Rose Fertilizer
Starting Rose Seeds: Warmth, Not Fridge, for Germination
Diagnosing Abnormal Rose Leaves: Light Green, Narrow, Shriveled Clusters
Rose Rosette Disease (Witches' Broom) in Heirloom Roses: Containment & Recovery
Miniature Rose Blooms Turning Brown: Thrips or Water on Petals
Rose Defoliated by Black Spot: Fungicide Strategy and Foliar Feeding for Recovery
Climbing Rose Blooming But No Leaves: Animal Ate Them
Pink Knockout: Spidery Leaves, Weak Blooms = Possible Rose Rosette Disease
Reviving a 'Dead' Knock Out Rose: Scratch Test and Hard Prune
Rooting a Florist Rose Cutting – Low Success Rate
Mystery Rose Beside John Austin: It's the Rootstock (Dr. Huey) Making a Comeback
Rose Rust in July: Not Just Spring Disease Anymore
Keeping a Sentimental Rose in a Pot Long-Term: Zone 7 Strategy
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