I planted a climbing rose a few years ago to grow up through an old evergreen tree. It had orange double blooms.
Over the years it hasn't flowered much although the stems have scrambled up through the tree as I wanted. This year it has started to bloom but instead of the original double style, orange flowers it has clusters of single white flowers with orange stamens. There are a very few of the original double orange flowers at the base of the plant still but all the ones that have grown above head height are the plainer ones.
I wasn't what I planned but it's very pretty and has done the intended job of brightening up a very dull tree in a shady corner of the garden but I just wondered why the flowers are so different?