Roses that suddenly change color usually have suffered a dieback above the graft union. (All-America Rose Selections) Q: My rosebush for years had yellow roses ... root-stock plant would've ...

Roses don’t like waterlogged soil, which can lead to root rot and yellow leaves,' agrees Petar Ivanov, gardening and plant ...

it is the rootstock the Julia Child rose was grafted onto. If any parts of the bush still produce yellow flowers, keep them. All parts producing red flowers should be pruned off and removed back ...