Foxtailing, where buds throw out stacked towers of new calyxes late in flower, gets blamed on heat and light stress but on many sativa lines it is simply how the plant grows. Thai and some Haze phenotypes will foxtail under perfect conditions and the resulting flowers are perfectly fine if a bit unusual looking. The photo comparison on https://hazesativaseeds.com shows the difference between genetic foxtailing and the stress induced kind, mainly in whether the older calyxes look healthy underneath. Panicking and dropping the light intensity is usually the wrong response.
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