You’ll know your plant's in veg when it grows fast and puts out those big fan leaves with 5+ fingers. The stem gets thicker, branches start forming at the nodes, and there’s no sign of flowers yet. That’s when you wanna begin to adjust your environment. For RH, aim for around 65–70% early in veg, then drop it down to about 50–60% as it gets older. And for PPFD, you’re looking at 300–600 µmol/m²/s—closer to 300 early on, then ramp up to 500–600 as the plant gets bigger. Make sure your light schedule is still 18/6 to keep it in veg.