I've been testing differences in pulls between season and winter seems to be consistently better for higher mescaline content all round. I too thought it might be cold related DFZ (and it still may be). However, it fits the evidence of lack of light. We know from previous nexus tests that if kept in the dark for (was it min 3 months?) content can double. Therefore, I surmise that it is more likely a light issue as winter has much shorter days (this can change a lot depending on where you live).
I also tested a friends pedro which pulled the highest mescaline content I've seen yet. It was harvested in winter but he had been pissing on the thing daily.
It still isn't big enough retest without piss (maybe next year will determine if it just has good genetics or it was the help of 'piss fertilizer' ). It does seem to help them pup though.
The 'piss fertilizer' did eventually cause the pedro to split in half vertically from tip down. Which was weird, likely too hydrated, my theory was it was the sodium from the urine, generally with cells wherever sodium goes H20 follows.