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When To Fertilize Blueberries Blueberry plants benefit from a fertilizer application in early spring or in early fall. Either fertilize blueberries first thing in the spring as the blossom buds begin to form, or wait until the leaves start to drop in the fall. Aug 08, While there is not a first or last date to fertilize blueberry bushes, the general rule of thumb is to fertilize blueberries in the spring before their leaves have grown in.

This is so that the blueberry fertilizer has time to penetrate the soil and make it to the roots of the blueberry bush before it enters active growth. Oct 10, Blueberry plants will not use nitrate fertilizers.

The effect of fertilization can vary depending on the site and cultivar.

Use ammoniacal sources of nitrogen (N) like ammonia sulfate, ammonia nitrate, or urea, and avoid chlorinated compounds like muriate of potash (KCl) and magnesium chloride (MgCl2). Blueberries do not fertilize the first year.

During the following years, fertilize with ammonium sulfate or a complete fertilizer (for acid loving plants) in spring. Split the dose, one as buds open and the second a month later. Increase the amount as the plants mature.

Only nitrogen is.