Kaya666answered grow question 6 years ago Well, it's a long ways off but you can figure it out by two methods. First, check the estimated harvest date given by the seed breeder/vendor to get a ballpark figure. Secondly, inspect the buds for signs of ripeness, such as pistil (hair) darkness & trichome coverage. Once the buds are ripe you have a 2-week window to decide when to harvest based on what kind of effects you want. This is based on trichome color. You'll need a magnifying glass or jeweler's loupe to see them up close, but you want to harvest when the trichomes are tall & mushroom-shaped (bulbous) with a milky white color...maybe a few amber or dark ones if you like a more sedated high. Make sure to check the trichomes on the calyx, not the leaves since they mature much faster.
New growers tend to harvest about 2-3 weeks too early, so if in doubt, wait another week or two before chopping. You can start your flush a week before harvest by just feeding plain pH'ed water with no nutrients, but flushing is not necessary for the safety or quality of your end product. It's more of an old wives' tale or individual preference. I just do a quick ice water flush a couple days before harvesting mine. 👍