Dark Purple leaves late in flower

bakertoad

Member
Had a problem with purple leaves that became obvious the last week of flower. As you can see the canopy facing the light darkened to purple, and the tips of a few leaves in one spot burnt a bit. The last picture shows that this was light triggered, the growth in slight shadow was still nicely green.

Other stuff: Indoor soil grow, and water was about 2.5L every other day
Weather caused a big swing drop in temp (from 90F to 50F)
[ From the Journal: https://www.rollitup.org/t/jack-herer-first-time-grow-small-tent-scrog-take-2.955979/ ]

I 'flushed' the soil as much as possible... and it didn't get worse, buds actually continued to fatten up all the way to harvest.. So, any ideas? Best guess I had was something lead to phosphorous deficiency, but temps, nitrogen burn..what's the deal with the light causing the purple?


NitrogenToxicity.jpg IMG_20171126_093514.jpg IMG_20171111_135330.jpg
 
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