The best way to tell is to buy a jewellers loop or magnifying glass on Amazon or your local hydroponics store. You want to look at the resin heads Under magnification and when the plant is ready they will all be cloudy as opposed to transparent. They go from transparent to cloudy to amber coloured depending on maturity. The point at which you harvest is very much a matter of personal preference because it affects the high. Harvest when all cloudy and no amber for a heady high, harvest with more amber 10-50% for a more couchlock body stone. Just remember, the more amber the trichomes, the more the THC is degrading into different compounds like CBN. I personally harvest when all trichomes are cloudy with 10-20% amber.
