Answer: Usually it is a good idea to run some basic soil tests and see whether or not you need to fertilize, and if so with what. This would depend on your soil and also on what you are trying to grow. The timing would also depend on what you are trying to achieve. Mature landscape plants may not require any fertilizer. Often, too, plants grown surrounded by or next to a lawn that is routinely fertilized do not need additional fertilizer. And if you are using an organic mulch this may be sufficient to feed the soil. There is really no way to know without running some tests. Your local county extension should be able to help you with the testing and interpreting the results. I'm sorry I can't be more specific for you.
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