Boost Tomato Growth: Add Phosphorus Now! Adding phosphorus to your soil should be done weeks before planting your tomatoes Four to six weeks is best This allows enough time for the microbes to break it down so that it’s usable for those plants to uptake Phosphorus needs to be added down into the soil at root level because if it’s just on the surface it’s not going to do your plant much good Phosphorus has a hard time working its way into the soil to that root level Phosphorus needs to be worked down into that soil at least three to four inches Phosphorus is responsible for the root development and healthy bud development That means tomatoes
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