What causes the inflorescence structure we often h...

"They say records are made to be broken. Mine are engraved in stone."

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Too intense light on polyhybrids with a dominant Sativa lineage in the mapping, particularly mexican sativa.

Generally genetics, especially Sativas.

In my experience its genetics but influenced by light and heat. The plant has to have a genetic possibility (many sativas do) to form foxtails which it will then do under certain influences. I got two different kinds of foxtails in my latest sativa run on my strawberry cough and my tangerine dream, actually enjoyed the look on the tangerine dream!

This deviation can arise from genetic makeup, excessive heat, light stress, or nutrient imbalances that cause elongated flower. It's a stress response

Most of the time it's genetics. But excessive heat during the flower cycle can cause it. Also too much CO2 can do the same. But it's mostly just genetic

I think 24/0 light schedule sometimes can cause it

WOW LOOK AT DAT!!!!! I FIND DAT WHEN I DO GET FOXTAILING IT IS FROM 1 OF 2 THINGS!!!!! WHEN I GROW OUTDOORS IT GETS VERY VERY HOT SOMETIMES IN FLOWER AND IT WILL DO DAT!!!! I HAVE ALSO SEEN SATIVA GENETICS DAT JUST FOXTAIL !!!! DER IS OTHER REASONS SUCH AS ROOT ZONE ISSUES AND OTHERS!!!!!!

Foxtailing is most commonly caused by stress on the top buds, especially from too high light intensity (lamp too close / PPFD too high), heat stress at the canopy, and overall excess radiant energy late in flower. These factors keep the plant hormonally in a “keep growing” mode instead of fully switching into ripening, so the floral meristem stays active and keeps stacking new calyxes on top of each other instead of finishing into one dense, compact cola.