Hey Growmie,
You're smart to be thinking ahead about flushing, it's a key step to getting smooth, clean-tasting buds. Since you're on Day 35 of flowering, you're getting into that critical stretch. Most strains finish flowering around 8 to 10 weeks (so roughly Day 56–70), which means you're still about 1–3 weeks away from the ideal time to stop feeding nutrients. In general, you want to begin flushing about 10–14 days before harvest. That would be around Day 42–46 for an 8-week strain, Day 49–53 for a 9-week, and so on. Since you mentioned it’s your first grow and you're unsure exactly when that point is, don't stress, use the plant’s visual cues. When around 70–80% of the pistils (those white hairs) have darkened and curled in, and most of the trichomes are cloudy with a few turning amber, that’s a good signal to start your flush. You’ll want to stop feeding nutrients and just give plain water, which helps the plant burn off what’s left in the system so your final product smokes smooth and clean. You’re doing the right thing by paying close attention. If you need extra support, feel free to drop me a message always happy to help you dial it in week by week. Stay growing strong!