As stated above the trichomes are the sure fire way to tell... but if u have no means of getting a jeweler's loupe or microscope there are other signs ur plants are good to go. Swollen calyxs with retreating pistils never mind the color of the pistils but if the hairs are curling inwards and not reaching out to catch pollen that's a sign that the end is near even the plant has given up on procreating... all out contrast of the plant will change giving u a harvest feeling look. Trichomes on the sugar leaves will ripen first look for darker amberish hue on your sugar leaf once u see that your buds trichome progression is about a week behind that of ur sugar leaf.
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