I have this sativa at the 7th week of flowering. Nutrition with pk bloom and pk boost. Ph 6.6 EC 2 .I made a roots flush and continue watering with nitrients. Idk why Almost all leaves turned yellow and purple. Needa more P?
I think it's a lack of nitrogen. When you flushed, that's what you flushed out and from the sound of it, PK Bloom and PK Boost don't contain any N, or very little.
That plant has at least 4 weeks to go. This is no time to flush
Plant looks great, Nothing wrong here. You may have flushed it a little early, it's stripping it's nitrogen. I'm thinking purple leaves are temp related. Don't change anything. It's doing what it is supposed to be doing. Just keep it watered and leave it be. Do not over water and let her finish up. Nice job!
Keep in mind that this plant is finished growing and needs very little nitrogen. I would suggest that you just let it finish up.
The plant looks right on! I think the worst thing you could do is shock it with a bunch of N. I'd consider cutting out the P and K as well. Just water. Let it finish stripping.
It's a very nice plant and will smoke great if you let it strip itself, then carefully dry and cure it.