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Fertilizers are for nutation for the plants.Most of the time it is used every two to three months.But it should not be used to much at a time or it could damage the plants roots.

All plants require the right amount of fertilizer to help them grow and stay healthy. A plant's nutritional requirements vary according to the stages of its growth life cycle.

Fertilizer should be used after a soil analysis indicates that it is needed. It's that simple.

every few months, unless the plant is dorment, and then wait to start in the spring.