Hi I wanna kno what should the ppm runoff range in soil be before I cut down my babies...the first day I started to flush i checked my runoff and my runoff ppm and I was at 1900 ppm so I flush till the runoff was between 400 to 600 and it took them 5 days before I had to flush again (give them water)
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As low as possible. Between 100-500 should be fine but look at your plant. The main goal in flushing is removing enough nutrients so the plant starts to fade. That is a sign that chlorophyll is reducing and not as much chlorophyll will need to break down during curing. It's technically not a requirement for your plants leaves to have faded before harvesting; although, the greener the leaves when harvesting, the longer it'll take for a full cure. Hope that makes sense. Also, flushing will help remove salts in the medium so if you flush at the end of your grow then reuse the soil, you won't be starting with lots of salt in the soil.