Fertilizing Trees and Shrubs Tree and shrubs are living investments that grow in value with each passing year. When properly selected and planted, trees and shrubs can be expected to thrive with the right care, which may include watering, fertilizing and pruning. Just as certain established drought-tolerant plants may not require water during dry spells, mature trees and shrubs growing in favorable soil conditions may require little or no fertilizer. Fertilizer is often misunderstood and misused.
Plants produce their own food in the form of sugars through photosynthesis.
The minerals or nutrients supplied by fertilizer provide the ingredients needed for photosynthesis and growth. When minerals are lacking or absent in the soil, fertilizer can be added to maintain an adequate supply. Fertilizer should not be considered a cure for ailing plants when unadapted or unhealthy plants are chosen, carelessly planted or improperly watered. Have your soil tested through the Clemson Extension Service. Depending on the results, you may need to add nutrients to make up for any deficiencies in the soil.