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Don't put it off if you really see a decline. It can be normal at the end of the season or after flowering, but if the plants are weakening gradually without an obvious reason, you need to figure out what's going wrong. Roses aren't super complicated but they do need a minimum of care.
First check your watering and drainage. Too much water kills the roots, so if the soil stays soggy that's a bad sign. The opposite too - if it's too dry, the plant suffers. Also look at sunlight: roses need at least 6 hours of direct sun a day. And check if there are pests or diseases like powdery mildew or spider mites, that stuff eats plants from the inside.
Then you need to think about nutrients. Roses deplete the soil, especially if they flower a lot. Regular fertilizer during the growing season helps a lot. And if you have roses in pots, the soil gets depleted even faster than in the ground. If things really don't improve, try repotting or refreshing the soil. Sometimes it's just that the plant is old and it's losing vigor, and you have to accept that that happens.
Stop overloading them with fertilizer thinking it'll get them going again - it usually does the opposite. Before you panic, check your soil drainage - standing moisture kills roses faster than anything else. Try scratching the base of the plant lightly: if you find green wood under the bark, there's still life in it, so be patient and give them a good pruning to remove the dead wood, that helps.
It really depends on the type of decline and the season, but one thing people often forget about is light quality - rosebushes that get less than 6 hours of direct sunlight start to weaken gradually, even if everything else is fine. If it's just after summer or heading into fall, that's usually normal, but if you're seeing leaves turning yellow or getting spotted, then you should be looking at fungal diseases rather than just watering or fertilizer.
You might just be looking at them at the wrong time of year to judge. In autumn and winter, it's completely normal for roses to slow down their growth, the foliage becomes less vigorous, and they give the impression of declining. It's just them getting ready for winter dormancy. But if you're seeing this during peak growing season (spring-summer), then you really need to dig deeper.
The three usual suspects that always come up: terrible drainage, too-aggressive fertilizing, and lack of light. But there's one detail people regularly forget about - soil compaction around the base of the plant. After several years, the soil gets hard, and water and roots struggle to move through. Try doing a light surface scraping at the base of the rose (without touching the roots), then add some good mulch. It makes a real difference just by letting water infiltrate properly.
And I'd say this too: before you start throwing products everywhere, just look to see if the leaves have spots, if you notice any insects, or if it's just general weakness. A rose weakening slowly with no visible symptoms is usually a soil or overexertion problem. Give it a rest period, improve its environment, and let it be. Roses are tough - they bounce back quickly once you actually fix what's wrong.
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