What would be a good dry fertilizer for trees and shrubs?
A quality product Garden Food 10-20-10 works well with decorative flowering trees and shrubs. With non-flowering woodies, a basic 13-13-13 works well. However in our area our soils are high alkaline 7.8 to 8.3 (See Soil pH) and there is usually ample phosphorus and potassium. Because our soils are high alkaline and usually high in potassium and phosphorous, this combination acts as an iron and mineral blocker (see Iron Chlorosis). As a general rule a high nitrogen 21-0-0 with 24% sulfur is sufficient. The sulfur reacts with soil moisture and lowers the pH and then the phosphorous, potassium and other minerals become more soluble. It would be best to contact your local Nurseryman, County Extension Agent or an Arborist for a suitable recommendation.
