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Last week now, very happy with the small plants progress over the last week, the larger plant however seems to have less dense buds and has already started to put out some amber trichomes on the sugar leaves. I will definitely cut them both down together, which is a shame because the larger plant I'm sure could probably do with another week or 2 from how the buds look even though amber trichomes are appearing.
Feeding regime is cut right down now and the next waterings will be water + sumo boost + citric acid for pH regulation, and the last 3 days will be pure water from the tap and nothing else. Haven't cut out everything just yet because I feel like they need just a little more nutrients so the leaves will only be sucked completely void of all nutrition right when it's time to cut them and not before. Nitrogen is cut already so they leech that off first before taking anything needed for bud production from the leaves, and hopefully that will give a better final taste and burn quality.
This could possibly run for 10 weeks if the fan leaves aren't looking totally dead before then, as I won't harvest until the plant tells me it's ready. This may give enough time for the larger plant to finish doing it's thing, but that ain't up to me...
@Herikus, thanks! Can't wait to get them rolled up. Tall plant looks real frosty, it's a shame it's not gonna go full length but should still be mighty fine.
@Psilocubensis, sulphuric acid is used simply to lower the pH of the nutrient solution, the tap water here is 8.4pH so after mixing usually it's above 7pH before regulation with sulphuric acid.
The citric acid is used to lower the pH further so a pH range is covered over a few hours as the pH naturally rises from the break down and plant uptake of the citric acid. But citric acid has another benefit, if you look up the Krebs Cycle you will find it's actually called the citric acid cycle too, and it's all to do with cell energy production and electron carrying etc throughout the plant. I wouldn't grow a plant without it