As for the White Rhino, i have the seeds from green house company. In your opinion, when i should harvest? 9 weeks it will be enough, now at 8 weeks i see more clear than cloudy trichs.
It is impossible to predict if it will change enough in one more week. You will just have to watch and wait.
I have read feew of your post wehere you say that most people are worng when they harvest at 50% amber as the peak levelsof thc are degradin in cbn.
Yep, that is how it works. Some people talk about wanting potent pot and smoking potent pot but when many harvest at peak potency it is too much for them, it is too potent, and they wrongly blame it on harvesting too early when it is a combination of them having picked the wrong strain that does not give them the body stone/couch-lock body buzz they hoped for so to get what seems like more of it they throw away THC, they lower the potency level, they tone down the THC in the strain and because 'The Dutch Masters' have pretty much bred CBD out of modern strains. They have bred for high THC levels, for true potency and potency only and not for medicinal properties.
Juiced Marijuana Offered to Medical Users as Alternative to Smoking
June 15, 2010
A California physician is offering his medical-marijuana patients a liquefied version of the drug that he says won't produce much of a buzz but does contain chemicals helpful in treating a variety of illnesses, the
Washington Post reported June 1.
Willets, Calif., physician William Courtney, M.D., said that marijuana with high levels of cannabidiol (CBD) seems to have the most medical potential; ironically, CBD levels seem to be lowest in marijuana strains of the plant that are highest in THC -- the main psychoactive substance in marijuana.
"What has happened is, almost all strains available in America through the black market are THC concentrates," said Ethan Russo, senior medical adviser to GW Pharmaceuticals, which is developing the marijuana-based pain medication Sativex. "The CBD in almost all cases has been bred out. The reason is cannabis in this country has been cultivated for its intoxicating effect."
Sam the Skunkman says that nearly all modern cannabis is pretty much CBD-free or the levels are so low as to be miniscule, landrace indicas are the way to go.
Right now there's simply no strains available where cbd will make up more than 2% of the overall cannabinoids (.5% of the flower weight) and no way of cultivating a noticeably higher cbd content. For the most part conversion of cbg into cbd is controlled by a single gene (Bd) which is codominant with the gene that converts cbg into thc. For example a plant that inherits a Bd gene from one parent and a Bt gene from the other will have roughly equal content of Cbd and Thc. However, if the plant is homozygous for Bd it will have very little thc and if its homozygous for Bt it will have very little Cbd.
While it is true that afghani landraces can have a high cbd content. Since having a Bd gene will replace half of the thc content with cbd seed companies always remove the Bd allele from the gene pool in order to maximize thc potency and stay competitive.
On many forums i have read that thc is degrading and forming cbd not cbn,
That is what a lot of people believe, but then people believe a lot of things that are incorrect when it comes to cannabis plants and how to grow them.
THC BIOSYNTHESIS
The capitate-stalked glandular trichome changes color as it matures. Newly formed and immature glands are clear, glands reaching optimum THC production are cloudy or milky and amber trichomes have already passed their peak. By looking at the trichomes you can also determine the best time to harvest your plants. When most trichomes have gone cloudy and a few amber ones have appeared, the plant is at its peak.
but that could be wrong as cbd levels are genetic and strain dependent, right?
CBD is genetic and is not increased trough THC degradation, though CBN is and since CBD has been almost totally bred out of modern strains and even though CBN is not the same thing and does not do the same thing, because it mainly does effect the body couch-lock lovers who do not understand cannabinoids think they are increasing CBD levels by harvesting when there are more amber trichomes.
Cannabinol is the primary degradation product of THC and increases in concentration with plant age. The concentration of this product in the bud is heavily dependent on the time of harvest. Harvesting the bud at a late stage also means that the concentration of CBN in relation to THC will be higher when compared to the peak of THC production.
CBN content increases as THC degrades. It is only mildly psychoactive and can cause "fuzzy head", drowsiness, disorientation and sleepiness in the smoker, properties that can be considered unpleasant in nature compared to the clear high of the THC. Its affinity to the CB2 receptors is higher than for the CB1 receptor, meaning that it mostly affects the body.
This is my first grow and when started i had in mind that i will harvest when more trich are amber because i want the medecinal effects of the cbd(i have anxiety disorders and sleep disorder) but now after reading few posts of yours i learned that i will cut from potency of the plant if wait to long for harvest and that amber trich dosent mean higher cbd, just higher cbn.
So whats your opinion on this strain from green house? Should be enough 9 weeks for good medicinal effects?
I am not a big Green House Seeds fan. If I wanted the genetics that won the Cup I would have purchased Medicine Man from Mr. Nice Seeds. But you can't set a date, a set number of days or weeks and say that is when you will harvest and be sure you will be harvesting at the best time. You have to go by trichome color.
Green House Seeds White Rhino is said to be a 9 week strain but breeder claims are just somewhat close estimates of how long is needed. Everyone's setup is different and when grown in different conditions flowering times will vary. You may be fine at 63 days and it might take 69 days or a day or three more or less. Watch your trichomes closely and when there are around 5% to 10% amber you will be at peak potency.
I would suggest if you are looking for actual medication that contains high CBD that in the future you Google medicinal marijuana sites and see what strains they suggest and who the breeder is and see if you can get one or more of those strains if you find what you have this time turns out to not be what you had hoped for, that or at least purchase Medicine Man next time.