I also use it primarily in a soak during repotting (1 or 2 drops/gal with 1/4 strength fertilizer solution) or when trying to coax those bare root imported species or hopeless-looking, root-rotted plants back into growth - my "go juice" is 1/4 strength fert + 4-5 drops ST + 1 crushed aspirin tablet per gal. (as a soak and then applied as a spray to plants lying on a bed of moss).
I will also use ST in VERY dilute amounts (1 drop/5 gal) in late winter (Spring for plants here in FL).
Someone once described ST as "crack for orchids". Use it sparingly.
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