As someone who prefers organic gardening methods and loves roses, I spend a lot of time experimenting with organic rose fertilizers. Here are my top five choices for rose food:
1. Compost - Roses love a nice, rich compost. You can substitute compost for mulch. Just be sure to keep an eye on the compost, as it will break down faster than shredded bark. You may need to spread another few inches partway through the summer.
2. Banana peels - They break down slowly, but these peels provide valuable nutrients in small doses. Bury a banana peel a few inches away from your rose bush and let it start feeding the bush.
3. Epsom salt - Not just for your gardening aches and pains anymore. Feed a quarter cup of Epsom salt to each bush by pushing back the mulch, working the Epsom salt carefully into the top few inches of soil near the bush’s base and then replacing the mulch.
4. Manure - Bunny or goat manure can be spread near roses almost immediately. Cow, horse and pig manure must be composted first or the roses will be damaged by the heat of the manure. Manure tea is a better option.
5. Coffee - Pour left over coffee near your rose at the base of the plant. (Never water the rose’s leaves with coffee.) You can also try spreading coffee grounds near your roses.