This post is intended to clear up some questions regarding CBD in 'drug' landraces.
For high-CBD chemotypes, you are best to try resin (ie, charas/hashish) landraces.
Landraces from the Himalaya, Middle East, and Hindu Kush can, as a rough 'rule of thumb', be expected to exhibit significant levels of CBD in approximately 75% of plants.
Evidence suggests that there are three basic chemotypes in traditional resin landrace crops:
1. Type 1 plants: high THC, low CBD
2. Type 2 plants: roughly equal THC and CBD
3. Type 3 plants: high CBD, low THC plants
Type 2 plants can be expected to make up about half of any crop, and Type 3 plants about a quarter. Note that 'high' and 'low' are best considered as ratios: some plants will have high overall cannabinoid content, some low.
Unlike hashish and charas landraces, tropical ganja cultigens typically less often contain medically useful amounts of CBD. The reason for that is that ganja landraces have undergone more intensive selection for potency (i.e. THC) and this has, roughly speaking, bred out the genes for CBD (CBD is not intoxicating or sedative, contrary to the old urban myths).
A plant with good amounts of CBD tends to produce a more centred, clear, and grounded experience than high THC varieties do. For many people, this gives a more enjoyable and indulgent high. Notably, the Lebanese has shown some promising high-CBD plants, one of which is pictured below.