I am going to try Espoma's bio-tone plus. It is an organic fert (4-3-3) with mychorhyzae. The manager at one of our local nurseries said it works really well.
I called Espoma, and they said one application a growing season was enough. They recommended that one should use Plant tone once a month afterwards to fertilize in order to not use any more of the more expensive fertilier. This will all be used on tomatoes.
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