Change in Rose Flower Color

Our rose bush had burnt orange blossoms for 7 years. This year, we have dark red roses growing on the same bush. It also seems that it hasn't grown as tall.

This is a common problem with grafted roses.  Most hybrid teas, some grandifloras and climbers, and a few floribundas are grafted.  Propagators graft a single bud of the desirable rose, burnt orange in this case, onto a hardy root system.  If the grafted portion dies the hardy rootstock takes over.  Cold winter temperatures are usually the culprit.  I have also seen cases where shoots from the rootstock sprout and flower along with the grafted portion.  Remove the rootstock-shoots to prevent them from outgrowing the more desirable rose. In your case you can either enjoy your "new" rose or replace it with one you prefer.

Related

Audio

2017 Year of the Rose

Video

Black Spot on Roses

Audio

Rose Flower Proliferation

Audio

Celebrate Rose Month – Eat Your Roses