I have a 30 year old pink rosebush - not sure what kind - is 5 ft tall and 4 ft wide. beautiful! Also have a wild yellow rose bush - scraggly and sprawling. Is it possible for them to cross? yellow bush had orange flowers on half side that's closest to pink bush! This only happened once in twenty years.
cross-polination
If they bloom at the same time, it is possible that they can cross-pollinate - in that they are both Rosa sp.
This only has any value in the seeds that are produced as a result of the cross-pollinated flowers. If you prune off the spent flower heads, then no seeds are produced from the partnership.
The original plants will experience no changes in flowering, flower color, or anything else. Your yellow flowering rose will not have changed as a result of growing near a pink rose. If your yellow rose was grafted onto some kind of understock that suckered and produced orange flowers, that could be an answer. The yellow rose might also have produced a sport or mutation which resulted in the orange flowers. This isn't a result of cross-pollination, though.
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