How to Fertilize Old Fruit Trees
As fruit trees grow, the fertilization process changes. Young fruit trees require different amounts of fertilizer than older fruit trees. Mature fruit trees that are four years old or older should be fertilized once a year with a 10-10-10 slow release multi-purpose garden fertilizer. Do not use fertilizer that has a higher percentage of nitrogen than the 10-10-10 fertilizer. Too much nitrogen will boost flower growth while stunting fruit growth. Fruit trees are generally fertilized during dormancy in late winter to early spring, between February and April. Contact your local extension office for specific fertilizing times for your area. Does this Spark an idea?
Instructions
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Measure the diameter of the trunk at a point 1 foot above the surface of the ground. You will need a 1/2-pound of fertilizer for every inch.
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Spread the fertilizer evenly around the trunks of the trees. Spread fertilizer in a 2- to 3-foot circle.
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Water the ground to allow the fertilizer to soak in.
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Take note of your fruit yield that growing season and the amount of fertilizer you used. If there is an inadequate yield, use an additional 1 to 2 pounds of fertilizer per tree next time. If there is an overproduction of fruit (which can sometimes yield poor quality fruit), decrease the amount of fertilizer by 1 to 2 pounds next time. Eventually you will find the perfect balance for your trees.
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Tips & Warnings
If your fruit tree has been neglected and is not producing a healthy yield, it will likely need to be pruned. Add 1 to 2 pounds of fertilizer per tree the year after pruning.
Soil testing kits can be obtained from your local extension office. Fruit trees should be in soil that has a pH of 6.0 or 7.0 Add lime if the pH is too low.
