A 3-year-old 'New Dawn' climber bloomed pale pink for two years, then suddenly produced bright fuchsia flowers after a fertilizer change. The gardener wondered if fertilizer caused the color shift.
All grafted roses are budded onto a vigorous rootstock (often 'Dr. Huey', a red climber). If a cold winter kills the grafted variety, the rootstock takes over—producing its own red/fuchsia flowers. Check: Are all canes fuchsia, or just one?
Roses have complex parentage. Occasionally a single cane "sports"—a spontaneous mutation producing different color/form. If only one cane is fuchsia while others remain pale pink, it's a sport. This can be propagated as a new variety.
Fertilizer affects growth vigor, not pigment genetics. The color change is almost certainly rootstock regrowth or a sport, not the new fertilizer.
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