1. Used Tea Bags or Leaves
As Roses love the Tannic acid that naturally occurs in Tea leaves. It’s a great idea to use used tea leaves or tea bags to fertilize your Roses. Tea leaves also make the soil porous and create a favorable environment for the growth of Rose bushes.
2. Egg Shells
Excellent source of calcium, eggshells acts to strengthen the walls of plants’ cell and help them in resisting the entry of pathogens. Besides promoting plant vigor in general, calcium maintains healthy foliage in rose plants, and strengthens their root systems as well, allowing them to uptake more nutrients from the soil. While the application of egg shells may not stave off diseases like black spots, it can definitely keep your roses healthy enough to make them less susceptible to the same. Crush a few egg shells and put them around the base of your rose plants, or add them before planting.
3. Banana Peel Fertilizer
Ripe banana peels are a useful addition to your rose fertilizing regimen. Roses love potassium and banana skins consist this mineral. And since they decompose easily, they rapidly release valuable minerals such as sulfur, calcium, potassium, magnesium, as well as trace elements into the soil. Grind them into a smooth paste and apply this around your rose bushes.
4. Apple Cider Vinegar
Both white vinegar and apple cider vinegar work to lower the pH of the soil and thus boost the growth of Acidophilic plants like roses. Just keep in mind, that vinegar lacks nutrients and adding it alone regularly in large amounts can have harmful effects on your plants.
5. Fish Bones
You know that bones are rich in vitamins and minerals, right? So, fish bones are no exception. You can sort them out when you cook fish the next time, and grind them up thoroughly for sprinkling around the rose bushes. Or, you can bury them into the tilled soil near the roses. Over time, they will break down, adding nutrients to the soil and helping your precious rose plants to grow.