When to stop applying STS?

Yeah you’re good

STS only needs 3 applications 5-7 days apart with a 2-3 millimole concentration... no more is needed. i did this with only 2 foliar applications at day 1 of flip and then 5 days later. I ended upw with about 1500 seeds on my 2 very small plants. you can see in my 'making fem seeds...' diary for scale reference. i only did 2 applications because i accidnetally OD'd it on the first one. you cause the 'change' long before you see nanners.. the change had to occur if you see nanners. you stop applying it long before you see male bits. CS is different. You need a lot more exposure with CS. fyi, fem pollen is quite 'light' ... even hard to see it. but it is there... collect it or shake the plant over another plant... you may not see mch but it doesn't take much either. They won't produce like a male... but it's mor ethan enough for 3000 seeds from tiny plants invovled.

You're all set on applying STS. Keep looking for pollen sacks to develop so you can collect. Good job.