First, do a soil test. If there are deficiencies, correct them. Unlike annual flowers, no fertilizer is recommended for trees if your soil is adequate. They need time to grow strong wood and stay healthy. An inch or two of compost or shredded leaves under the drip line is all that is needed. Keep up with watering as this plant does best in moist to wet soils.
Answered on March 23, 2019
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