I usually avoid soil and fert threads because variables and tempers run high. But I will share this experience: last year I swapped my PlantTone cakes of 10 years for Dr. Earth in teabags, all year, using roughly the same quantity; 15 lb for the year, maintaining the usual weekly +/- fish emulsion, and it was the worst year for growth I've had in a decade. Spring extensions stalled out by June, candles were smaller and later to return after candle-cutting. Even my ume's blooms this spring were less than half of previous years.
1/5/15 and 1/11/16:
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This year, I returned to PlantTone and supplemented with Biogold and it was another great year of growing. The Ume is budding up nicely too. This is not scientific, just my experience, but it was noticeable and interesting.
12/23/16:
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