Long as your sticking with landrace genetics. You should be fine.
Once you make a crossing. Repeating that cross and getting the same results with any different parent, even from the same seed batch. Your going to get a change in result. It'll now include that pheno's traits.
Yet a note on landrace: Say you have a patch of cannabis growing in an area. There is another patch, say 10 miles away. They maybe the same strain but, have differing genetic makeup.
Say the wind blows some pollen from #1 to #2. The genetic make up has now changed by natural genetic "shift". This is now still the same strain but contains differing phenotypical traits being expressed by the difference from each, now combined.
Say one was highland and the other lowland. You now have a combination of each. I always prefered the highland Thai over the lowland Thai's.
My opinion though.
Many landrace strains are very regional. They tend to be isolated from others of the region by natural limiting factors. They
tend to stay
right about where they are genetically speaking.
Picking landrace seeds for projects, is just as important as picking any cross for a project.
I got some beans from a military service person that served in Iraq. They ran very nicely, yet. They do express like a cross. Ind x sat.....I have no idea what the hashmaker did as far as any cross to his held strain.
Potent and long lasting buzz. Definitely a cross somewhere though. Leaf/plant structure and smell.. Tell me so.
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Day of harvest shots.