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Is it time?
To each his or her own... But I'm thinking that in another week there will still be plenty clear trichomes and few ambers. Most of my friends and I like a more active buzz so I try and pick with mostly cloudy trics and don't wait for them to amber up. My last crop is plenty stoney and I have quite a bit left to smoke. Looking for a heady buzz this round.
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Is it time?
Wow looking tasty!
How long you leave it depends on what you like from your bud. Harvesting with lots of milky white trichs give you a more active high- lots of whizzing thoughts, giggles etc whereas more amber ones will give you a more couch potato high.
The longer you leave it the more that will begin to turn amber.
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Is it time?
Everyone keeps stating "microscope," may want to look for a "jeweler's loop." 25X is okay, 40x is good... spend a little more and get even more detail.
As so many have stated, when to pick due to color of trichs is up to you. Extremes, sativa that is mostly white vs indica that is mostly amber. Try growing indica and harvest when it is still mostly white.