I'm currently using BioCanna's Biovega, Rhizotonic, and Cannazym, and BMO Super Plant Tonic and about to go into flowering. I've got BMO Flower Power, but not sure when to start using it, and wanted to use BioCanna to flower also, but their flowering stuff is waaay over my budget, ($105/bottle). Any advice?

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you using way different nutes then i am. I like Earth Juice's products except catalyst. Check them out, very reasonably priced.

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HTL... Stick with just one nute for flowering. The more you use, the more potential for trouble. The Flower Power from BMO is good stuff. When you see preflowers, start using it at half strength. Also keep using your grow formula, but also at half strength. Overlapping them, prevents premature yellowing of fan leaves.
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Then at four weeks into flowering, drop the grow formula and up the flower nute strength. At week six, stop using any nutes, and use only the SPT / water. After week 6 only water and let your girls coast to the finish line. Don't sweat the lower fan leaves yellowing up. It's completely normal toward the end and helps to ensure the plant uses up the nutes in the soil and in the nonessential leaves.
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Hope this helps...
Keep it Real...Organic.... & remember - more expensive - does not equal better quality - expensive advertising & flashy labels (are expensive).

awesome, thanks

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But what if the plants you are growing are Sativas and need 11 weeks of flowering? Would I just adjust that schedule for 11 weeks as opposed to 6?

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Good question...I think most of mine will be ready in the 50-55 day range, but what if you get a sativa? Maybe you have to eye them...

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For 11 week plants - during flowering weeks six & seven - just keep using the grow & bloom ferts (both) at half strength. Week eight at 1/2 strength bloom only. Then from week 9 to week 11, do the plain water coast down to finish. I normally reduce doses from full to half, then quarter strength - but since sativa's are such big girls as a rule - it's best to stick with the 1/2 strength doses to make sure they are fed properly.
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Hope this helps...
Keep it Real...Organic...