If you want DMT and your winters freeze: Desmanthus leptolobus [grows like a carpet] or desmanthus illinoensis [grows like a bush]
If you want DMT and your winters dont freeze, or you can take bushes indoors for winter: Acacia acuminata 'narrow phyllode'
Morning glory seeds are nice.
Cacti are nice too. Trichocereus bridgesii or a cross between it and other known potent cacti.
In addition to being potent, T. bridgesii has the benefit of freely growing new stems from the base when given tomato fertilizer so harvesting branches from it is not obvious from several meters away.
Mushrooms can be easily grown, you can start with the simple 'PF Tek'