If peonies are planted too deep they don't bloom well. If they were newly transplanted in the last 2 to 3 years, they will often take time to re-establish themselves before blooming again.
You don't say what type of roses or how and when you pruned them, if you did at all, so it's difficult to say what the problem is. An example could be improperly pruning climbing roses and/or not growing them so their canes are horizontal at some point. Growing them horizontally will get you more blooms. If these were grafted roses and you pruned below the graft, then what you have now is the rootstock and your flowers won't look the same. It can also take plants that have been pruned this way a couple of years before you have blooms.
Newt
Overfertilizing with nitrogen can also cause lots of leafy green growth at the expense of flowers for many plants.
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When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.
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