Unless you're a breeder, you have no reason to hold and grow landraces - They're usually trash when it comes to the traits we care about. The reason breeders like them is that they *might* have unique individual traits somewhere in their genome that we can combine with modern cultivars.
Many of us are collectors, as well as growers and breeders ...
The landraces (although not always a correct term) are unique, I would give most of my seeds to have Mexicans, Thais, Africans or Afghans of the years 50-60-70, when the chances that they were hybridized were nothing .. I would pay gold for authentic non-hybrid Moroccan kif plants, even though they were almost all hermaphrodite and with low potency ....