Q: I recently installed an underground fertilizer injector, and I was told to discontinue fertilizing by hand. Does this injector replace fertilizing plants by hand? Is it beneficial as a supplement?

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Every garden needs periodic fertilization. “Designer” fertilizers are available for some kinds of plants, and so are fertilizers that you’re directed to apply at specified times throughout the season.

There are 17 nutrients that are essential for plants to grow and thrive. They are grouped into macro-nutrients and micro-nutrients. Macro-nutrients are those nutrients that plants use in larger ...