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hard rain
Seeds would only have to survive a voyage. Fresh seed will last a couple of years almost no matter how badly it is stored. The scale of the slave trade was incredible. It would only take a few seeds to make it. I find it quite plausible that seed came with the African slave trade.Thanks mate...
I can almost buy that.
My main reservation is that the shipping of slaves was done in the most awful of conditions on the whole. Even assuming that the captured slave was "somehow" allowed to get hold of seeds, how on earth would they have kept them in any sort of decent state? Now the slavers... maybe, that's more of a proposition IMHO.
There is also a huge distance between Colombia and Brazil, even more for Mexico. There were no real road routes AFAIK. Also the presence of slaves in Mexico I think was minimal. Correct me if I'm wrong.
The only thing I think is irrefutable is that there was an established cannabis culture in Mexico and Colombia in the mid-19th. Less so in Brazil, funnily enough.
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PS. The erowid time-line is interesting enough and there is some very good info, especially re more recent years, but I'd question the entries on some of the earlier dates. There are some sloppy and suspect snippets there.
The slave trade existed in Mexico. Read the link below. Interesting the regions mentioned are places I have heard produce good cannabis.
http://en.wikipedia.org/wiki/Afro-Mexican
Interesting topic.