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Every so often you will get a hickup of nature and get something like what you had. It can also be caused by feeding the roses with a high nitrogen content fertilizer. The rosebush should return to normal blooming status with the next flush of blooms. If not, there may be a genetic problem in that particular cane of the rosebush if such blooms keep coming. Or it may be that high nitrogen fertilizer has been fed for a long period of time and will take some time to wash out of the soils and also the bushes root system. Many of the so called Bloom Buster fertilizers are actually very high in nitrogen content, which over time will increase foliage and eliminate blooming. We have to watch out for those endless marketing gimmicks! :-)

I usually prune out those canes as they typically have a genetic issue that will not support any blooms or weak blooms. Pruning them out keeps them from sucking nutrients from the rest of the bush. Once I have pruned them out, I put a cup of Epsom salts around the base of the rosebush, work it in to the soils lightly and water in. Then in a couple weeks you can give them some high iron fertilizer too.

Here is a link to an article I wrote on deadheading roses for you. > https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-deadheading.htm If the rosebush you have is a shrub rose, it may be needed to have a trellis there for the rosebush to grow up against for support.

After the rosebush roses have bloomed, I deadhead them by pruning off the old blooms down to the first 5 leaf junction with the cane. This is not really done to keep the rose from going wild but rather to encourage more blooms. Usually by pruning back to the first 5 leaf junction, the cane that is left is larger in diameter and better able to support the new growth and new bloom or blooms. Here is a link to an article I wrote on this subject for you too: > https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-deadheading.htm

Here is an excellent article that will help you save your roses!

https://www.gardeningknowhow.com/plant-problems/pests/deer/do-deer-eat-rose-plants.htm

I have tomato plants planted right next to my wildflowers in one flower bed. If you spray your rosebushes with any systemics, it would be best not to plant the tomato or pepper plants close by. It would be better to keep the edibles at one end and the roses at the other. Even granular systemic treatments for roses and flowers would not be good to have in the same soils with your edible plants. That is why I have my tomatoes planted by the wildflowers as I do not use anything on those but water and occasional fertilizer.