Now these are the type of genetics you are trying to achieve. If you look at this stem morphology, you can see that this particular specimen has thick woody ribs. A very worthwhile trait.
This accomplishes two very important things, increasing the rate at which branch/bud production is possible, but also better physically supporting a yield on a high producing plant. This can help to prevent sagging and breaking branches.
Pictured below is #39 a 2 year old Purpusii x Halley's Comet hybrid still being evaluated.
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