Great questions Christine (And Stephen).

I couldn't find much in terms of research but I did find this study (https://www.sciencedirect.com/science/article/abs/pii/S0360132321007745) which offers some interesting information.

I also noticed that one of the sources I link to in my article (https://www.sciencedirect.com/science/article/abs/pii/S2214785322039062) states that "the porous structure of the Hempcrete decreases its mechanical performance and increases its ability to retain water."

So I have a feeling the material likely holds up best in drier climates. That's not to say structures in wetter/colder climates wouldn't still benefit from using hempcrete in other capacities, even if it's not the primary building material.

I hope this helps answer your questions. Thank you for sharing your thoughts and curiosities. I appreciate you!