Environment can tilt the male female split a little, though not as much as some guides claim. Cooler temperatures, higher humidity, a bit more nitrogen in early veg and blue heavy light during the first weeks all correlate with slightly more females, while heat stress, drought and cramped roots push the other way. The studies behind these claims and how strong each effect is are examined on https://breederregularseeds.com, and most shift the ratio by only a few percent. Worth doing since it costs nothing, but do not expect miracles.
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