DUNWOODY, Ga. â The Dunwoody Community Garden and Orchard held a master gardener class on May 8th covering proper watering and fertilization techniques. Improper attention can lead to disappointing crop yield as plants come to term in the coming months. Master Gardener Richard Osterholtz conducts a class on proper methods to nurture plants Saturday, May 8 at Brook Run Park. Both watering and fertilizer are key elements for successful plant growth and cultivation in the coming months, he said. JEFFREY ALBERTSON/CRIER The talk, led by Richard Osterholtz, discussed the importance of morning watering and using fertilizer to maintain a healthy pH balance and growth in a garden plot. He also covered how to build an organic 10-10-10 fertilizer with an equal balance of nitrogen, phosphorus and potassium.