Personally, because I live in an area with high humidity, I never foliar feed tomatoes (or roses) because of the risk of fungus. But I do foliar feed just about everything else every two weeks.
Last year I started using Neptune's Harvest fish and kelp blend, and it seemed to work very well.
This year will be my first year using Actinovate. And I plan on using it as a soil drench when I plant out, and then every couple of weeks as a fungicide spray for the rest of the season.
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