Landrace Lines Come Regular
Landrace and heirloom material is almost always sold as regular seed, because feminizing it would defeat the point of preserving the population. Those lines tend to be variable, slow in flower and not especially forgiving indoors. Background on which regions the surviving lines come from, and what they are used for, sits on https://breederregularseeds.com for anyone curious. Preservation work is a different hobby from growing for yield, and mixing up the two leads to disappointment.