Grafted roses can revert if the top dies. The swollen knot near ground is the graft union. Sprouts below it are from the rootstock—often a red variety. Your yellow/pink roses didn't change; they were replaced.
Identifying a Rampant Once-Blooming White Rose: Wichuraiana Rambler Heritage
David Austin Rose Colors Changing in Second Flush
Rose Flowers Suddenly Smaller – Root or Insect Issue
Why Your Miniature Rose Changed Colors: The China Rose Connection
Why 'Pierre de Ronsard' Takes Years to Bloom: Managing Expectations for Slow-Maturing Climbers
Identifying "Red Apollo" Rose: Likely a Renamed Variety
Why Geranium Flower Color Shifts After Planting: Light Intensity vs. Soil pH
Finding True Red Rose of Sharon Seeds
Why 'Oklahoma' Rose Fades from Dark Red to Pink in Heat
Knock Out Roses Turning Pink: Sport or Stress?
When Do Bell Peppers Change Color?
Flowering Shrub Sports: Camellia, Azalea, Rose Color Mutations
Hummingbird Nectar: Skip the Red Dye, Use a Red Feeder
Confederate Rose Hibiscus: Flowers That Change Color Through the Day
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