Southwest Yard & Garden By Marisa Thompson Several Afghan pine trees are stunted and have thinner canopies than others. More photos below. All photo credits Michelle J. Question: I have 120 healthy Afghan pine trees, but about 10 may need fertilizer because they're not as full as the others. When and how much fertilizer should I apply around the drip line of a 25-ft tall tree? - Michelle J., Dona Ana County Answer: Great question! Thank you for seeking local recommendations before taking action. Here’s my preliminary response, followed by further discussion: Tree decline can be a real mystery, and your question raised more questions for me than answers. My response questions mostly revolve around how you care for your trees. · What are your irrigation practices? Details here can be helpful. o What’s the primary method you use? o Do you flood the area with a garden ho...