Many strains have 2 and 3 rounds of swelling. This is where the pistols will turn red or orange and then swell, then new pistols emerge. Some say you can't follow pistols at all for harvest. Especially with more sativa leaning strains, as some don't ever full turn all pistols orange or red.
The only way to truly know is to check your calyxces, the little round ball with a hair coming out of it where two branches separate. Once you identify one, look at the bottom of each bud. Each bud has one. it's what forms the buds to the stalk.. these are where you check your thricomes.
Buy a 30x and 60x magnifier or jewlers loop. Ac infinity has one for . This will allow you to check your thrichomes.
Most shoot for 20-30% amber "orange yellow colored"..
Thrichomes start clear, then turn cloudy then turn amber.
The peak THC is cloudy..
The more amber the more couchlock effect you will get as THC gets converted to CBN.
If you want uplifting energetic high go all cloudy
If you want medicated sedative couchlock go 30-50% amber
If you want a balance of both go 10-20% amber.
Also take into account most allow sativas to go longer and show more amber because they are already uplifting plants. It balances them out.
Most cut indicas early and all cloudy as it's already heavy sedative feeling.
Some don't care and go 10-20% amber so they have a balance regardless of sativa or indica.
You can cut some early while only cloudy and try it and cut some later so you can see which you prefer.
But multiple stages of pistols is OK
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