Need help to find right time for harvest

Sounds like Amature has been quite attentive to their plant! Flushing is a good practice to ensure a clean and smooth harvest. Given that it's an auto ultimate on day 81 and has been flowering for 8 weeks, it might be close to harvest time. Here are a few things to consider: Trichome Check: Look at the trichomes under a magnifier. If they are mostly milky with some amber, it might be time to harvest. If they're mostly clear, give it a bit more time. Consider the Strain: Auto Ultimate tends to have a flowering time of around 10-12 weeks. Day 81 is getting close, but the specific phenotype and growing conditions can influence the exact timing. Light Cycle: Your 24/0 light cycle might be contributing to the long flowering time. Consider switching to 12/12 for the last part of the flowering stage. This mimics natural light conditions and can help with bud development. Nutrient Deficiency: Make sure the plant has all the necessary nutrients. If you've been flushing, it's essential to provide the plant with the nutrients it needs for a healthy finish. Patience is Key: If the trichomes aren't where you want them yet, be patient. The last weeks of flowering are crucial for bud development and potency. Amature is doing a great job with the information provided. Keep monitoring, and you'll be enjoying your Auto Ultimate harvest soon!