Wet Summer, Weak Flavor

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A good dose of foliar K fertilizer 2 weeks or so before ripening is said to boost taste a lot. I never used foliar, but adding high K at ripening time in the soil is definitely helping the taste of my container tomatoes (i use an organic 4-8-10, because that's what I have).
If people can have good tasting tomatoes in hydroponics, there's no reason not to have good ones in rainy conditions (unless there is a prolonged lack of sun).