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I can't say anything about the grafting of pups except good luck and I am envious of anyone in the positio to do so.
As for dosing, you are recieving limited replies because the information is here in the Nexus if you search for it. My personal advice is to start with 20 cm and go from there. Prepare double that(40cm) in case the first 20 isn't doing it.
Remember, you can redose again and again with this substance and lose little to no loss in potency due to tolerance.
Cacti are a natural product and vary GREATLY in potency for to many reasons to list. Pedro also has other alkaloids besides just mescaline that are psychoactive. They are a bit stoning and come on quicker than the main attraction. They last a couple of hours and then lead into the mescaline. Mescaline takes AWHILE to come on, so, until you are used to the effects, take it slow.
On the other hand, depending on your experience with other psychedelics, know that Pedro is the friendliest entheogen I know of. I can't even imagine a bad trip on it. So...
Don't be too disappointed if your particular succulent is not potent. It happens. Just try again. It is wonderful medicine.
Namaste,
J
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Ѯ҃Who looks outside, dreams. Who looks inside, awakens. Carl Jung