What's the best natural way to feed and care for your rose garden?

Try Banana peels bury them near the trunk, they need potassium to bloom, Carina, good luck

http://www.heirloomroses.com/info/care/how-to/fertilize/

https://www.bayeradvanced.com/articles/6-secrets-to-growing-roses

I'm not sure of your location or the type of roses you have, but the one thing I do that ensures my roses are beautiful is I trim them to about a third of their height in early spring (March around here), and then I cover the base of the bushes with Black Cow manure immediately after pruning. This keeps the roots warm and gives nourishment to the plant.

epsom salts are a great natural aid for roses

Pure worm castings are the very best natural fertilizer for roses or anything else you like to grow. Bonus, you can't apply too much and burn them, like you can with chemical and other animal fertilizers. In tests plants that were planted directly in pure 100% worm castings produced over 400% more of whatever was being grown! You can't loose!

Banana peels and coffee grains are good for roses. I use a recipe that I got from a Jerry Baker book. It includes

1 cup of beer

2 t of instant tea

1 t of Rose/Flower food

1 t of fish fertilizer

1 t of hydrogen peroxide

1 t of liquid soap

these items mixed with 2 gallons of warm water.

t = teaspoon