Miracle-Gro Remedy Formerly known as MirAcid, the product now called Miracle-Gro Water Soluble Azalea, Camellia, Rhododendron Plant Food provides blueberries with added iron, acidifiers and other nutrients. Mix 1 tablespoon per 1 gallon of water for a 10-square-foot area.Click to see full answer. Similarly, you may ask, can I use Miracle Grow on blueberries?Blueberry bushes will grow strong and prolific when you use Miracle-Gro® soil and plant food together to create the ideal nutrition-filled growing environment. Doing this won’t just feed your blueberry bushes, but will also feed the microbes in the soil that help your plants take in all the nutrition they need.Furthermore, when should you fertilize blueberry bushes? Fertilizing is recommended in early spring before the leaves have grown in. This gives the fertilizer time to be absorbed by the roots of the blueberry before it enters its active growth stage during summer. Feed new plants once in early spring and again in late spring. Also, what is the best fertilizer for blueberries? Blackberries respond well to any nitrogen-rich fertilizer, but blueberries require fertilizers with an ammonium form of nitrogen such as urea, sulfur-coated urea, ammonium sulfate, or cottonseed meal. Any fertilizer sold for azaleas or rhododendrons also works well for blueberries.Is Epsom salt good for blueberry plants?If your blueberries need magnesium, Epsom salt grants temporary relief. In deficient soils, broadcast 1/4 cup of Epsom salt in a 10-inch diameter around the plant, and water thoroughly. If high pH is the real culprit, extra magnesium in the soil won’t help, and Epsom salt’s sulfur doesn’t affect pH.