I have an autoflower space with 3 plants going at day 76.
5 days ago they were beautiful, but since then
they have been drinking less (they were drinking every 2 days, now its 4 days and still the medium is partially heavy), and
a very few colas have dark purple leaves or darkening.
Also, i I dont know if its my paranoia, but the trichomes seem to be shrinking or be less shiny.
Any ideas appreciated 
Sounds to me like she is going into senescence, harvest is right around the corner.
Thanks @ReikoX !!
I hope so! I thought senescence signs only appear after flushing - does senescence happen even without flush? (im not flushing)
If so, im going to harvest this weekend., most trichomes are cloudy with very few amber. If i dont cut this weekend I would have to wait 15 more days and I think that would be too much.
Agreed.
OP, most plants toward the end of flower usually start looking a little rough. There’s not much you can do about it and it’s the buds we’re after anyway, not the leaf.
P deficiency is rare. Actual deficiencies of any kind are rare. Most Cannabis nutrients have plenty of P. I don’t see anything to worry about. Plants look fine.
I don’t flush either and even with normal strength flowering nutrients most plants will start to fade anyway.
Yep, I agree with Vernal for once (just teasing). 
