If you’re into growing roses, you can use the purely organic “companion plant principle” to maximize their health, beauty, and bloom production. It’s well known that some flowers work very well together, mostly because one of the pair protects both from disease and insects. For example, roses grow very well in combination with garlic, onions, and other members of the onion family (that’s over 500 species), and hey, with most of them you get tasty veggies as a side benefit. If you’re looking for decoration instead, try marigolds or mignonettes. Marigolds are also somewhat good at deterring weeds. The herb thyme also makes a nice, harvestable companion plant that your roses will love.