How bad is the foxtailing? I think it's due to the combination of light and heat. I had temperatures of about 30 °C for around five days and unfortunately couldn't do anything about it. Also, the plant has become too big for my tent and is only about 10cm from the d

plant your plants, at this time the branches will grow upwards.

The foxtailing isn't terrible yet but it is definitely caused by that 30°C heat wave and the light being only 10cm away. Being that close to the light will cause severe light bleaching and heat stress very quickly. Dim your light intensity down significantly if you cannot raise the fixture any higher. Supercrop or gently bend the tallest main cola horizontally to increase the distance from the light.Add an extra fan blowing directly between the canopy and the light to dissipate the heat trap.

Genetics..........heat is not the cause, neither should your lighting do this unless you have a "Temu special" blurple light.

All the variables of light, heat, nutrient imbalance can fox tail can also be hormonal and genetics. You could trim the top foxtails to redirect auxins after the stretch

30c wouldn't do that.. it may have added to the effect slightly, but not the primary cause. I'd wager either genetics or too little light. Node spacingn seems fine, so unles you reduced light more recently, i'd lean genetics. if the stem elongation stopped (part of 'vege' growth), snap the stem about 6" below the height you want it to be (HST). Try not to damage the vascular tissue too much.. support at as needed, but within 24-48hours, you'll need to hold it down, not up. The top portion of brench will bend back toward the light - hence the suggested "6 inches below the height you want" if some vege growth remains, i doubt, break it down a bit lower. Anyway, that's better than the top being burned by the light. Nothing you can do about the growth pattern now. I've seen this trait on autoflowers more than once, but also rarely in photoperiods. I just had a couple in my last grow (2026-2). The stem elongation seems to linger into flower and causes stretched out buds / foxtailing etc... not unlike "Dr. Grinspoon" but less extreme.