cannabistro.de - If weed gets legalized in Germany, these this might be a decent name.
ugweed.com - Not good. Businesses don't want to name themselves "weed" anything.
pototc.com - I don't see the connection to canna.
nordicpot.com - This makes me think of a cooking pot...
cannabispace.com - The shared s kills the value.
cannabisector.com - Same. Worthless.
cannabiz.business - The z kills the value once, the business tld kills it twice.
Cannabistro would be great in .com. I'd drop all of these.