What type of fertilizer do you give birch bark trees?

Birch bark trees benefit from a balanced fertilizer with an N-P-K ratio of 10-10-10 or similar. It's important to apply the fertilizer in early spring as new growth begins. Organic options, like compost or well-rotted manure, can also be effective, helping improve soil health and moisture retention. Always follow the recommended application rates to avoid over-fertilization.