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Harvest window for very high CBD, very low THC strain.

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    Harvest window for very high CBD, very low THC strain.

    My first grow (Gen 1), 6, somewhat over grown and gangly flowering ACDC clones in my 12/12 lit grow tent. 7 weeks since I changed the lighting schedule. ACDC strain is expected to be ready in 7 - 9 weeks of flowering. MANY not very big buds, this I presume because.

    1. I let them veg too big before putting the lights to flowering schedule, so they've somewhat outgrown the available space and lighting.
    2. Not aggressive, pre-emptive enough about training and defoliating in both veg and bloom stages.

    At this point, there are many clear sparkly trichomes, and a few that my inexperienced eye sees as cloudy. I think I saw a couple turning amber on one bud, but all the rest I examined have no amber trichomes yet.

    Meanwhile, my next crop (Gen 2), cloned also 7 weeks ago from the first ones right before I switched the lights, is really looking like they need to go into the tent (particularly because I'm trying to improve on my Gen 1 results) They are currently in my atrium with supplemental lighting to make sure they stay in veg now that the days are shorter. These are not being lit ideally for rapid growth there, which is OK by me, since there's nowhere to put them yet anyway. They're been topped, and range in height from 8" - 10".

    All of what Ii've read here and elsewhere indicates that CBD content is not particularly affected by waiting for trichomes to mature to a certain point. So, I'm thinking, maybe pull 'Gen 1' and start drying it. And get Gen 2 into the tent with the '300W' LED's etc. Another factor is that I'm going to be turning the whole Gen 1 crop, buds and trim into RSO, so maybe waiting for my buds to become just a little more perfect is not going to improve my yield of CBD anyway. Priority should be to optimize Gen 2, by getting them into better lighting, and properly training them. (I have other questions about that, but that's another topic.)

    So, in fewer words, given that this strain is supposed to produce about 19:1 CBD:THC, and I'm really only after the CBD. Am I likely to do any better by letting them go another week or two, than by harvesting them now? I will add a picture tomorrow. They're in the dark right now.

    #2
    I would go to week 8 .

    Comment


      #3
      That'll be the coming weekend. I think so too!

      Comment


        #4
        Yes jalapeno, I was also curious on whether or not the CBD is present in trichomes earlier than when the usual recommendations for maximum THC occurs (mostly cloudy). Maybe someone with the scientific expertise knows that answer. Other than getting it lab tested, it is not so easy to judge the effects of super high CBD strains compared to high THC strains (which can easily be felt, good or bad!). 🐸
        Current grows...http://forum.growweedeasy.com/forum/...ime-collection
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          #5
          I sent email to SC labs (local for me) to find out whether getting my RSO tested would be a budget breaker. Haven't heard back yet. For CBD, my wife, the patient, will know pretty quickly if there's enough in there to relieve her symptoms. However, I will want to have a more precise measurement in order to compare the net production cost per gram with the cost of the excellent product from our local dispensary which we buy now, at about $100 / gram of actual CBD, and to see if my efficiency is (hopefully) improving from crop to crop as I gain know how.

          Comment


            #6
            I grow "In The Pines"- which is a low THC @6% and high CBD @9% and there is a noticable difference according to when you harvest, where 2 weeks can have a negative effect on this strain. Also, improper curing will also affect his strain- causing more CBN.

            When I harvest, just as the all trichomes get cloudy- it has the best effects, but waiting 14 more days for multiple ambers- deteriorates this strain signifcantly.

            My best guide is to harvest at the very first amber.
            Last edited by Weed Pharma; 11-02-2017, 05:21 AM. Reason: note about curing
            It's all bullshit - until you smoke it!

            KISS @ Dry/Cure:
            https://forum.growweedeasy.com/forum...-kiss-dry-cure


            Staged Harvest:
            https://forum.growweedeasy.com/forum...e-in-the-wings



            Grow Journals:

            #3, Window Sill Grow - auto:
            http://forum.growweedeasy.com/forum/...nic-soil-24-7g

            #4, KISS grow- Girl Scout Cookies- auto:
            https://forum.growweedeasy.com/forum...ies-autoflower

            Comment


            • Weed Pharma
              Weed Pharma commented
              Editing a comment
              jalapeno, FROM LEAFLY:
              As THC oxidizes (i.e. exposure to oxygen over time), it converts to CBN. This is why aged, poorly stored cannabis is likely to have higher levels of CBN than fresh flower in an air-tight container. Improperly cured cannabis is also linked to higher amounts of CBN, so it should come as no surprise that this cannabinoid is scorned by many as the mark of bad bud and banished to the bottom shelf.

            • jalapeno
              jalapeno commented
              Editing a comment
              Strain I'm growing, ACDC, is supposed to produce about 1:20 TCH:CBD, so I'm not too worried about THC degradation to CBN, and as a sometimes insomniac, a little CBN is sometimes welcome anyway. However, the present goal is to economically replace all or part of the high CBD edible oil (75% CBD, 3%THC) that I purchase from the dispensary. About 100mg of CBD a day eases my wife Parkinson's symptoms, but even relatively small amounts of THC can be unpleasant for her on a day to day basis.

              There seems to be little specific advice available on what factors may positively or negatively affect CBD content, other than of course choosing an appropriate strain to begin with, and general plant health.

            • Weed Pharma
              Weed Pharma commented
              Editing a comment
              jalapeno, here is a pdf edition of Marijuana Botany. Perhaps it will be useful, as it talks about breeding for distinctive cannabis and methods to change the ratios.

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