Hi new here.....I been playing around with hempcrete wall construction. I've read due to its high silica content (like no other cellulose plant) and strength due to its length (since it is tall compared to its short, wide, marijuana cousin) of the "herd or shiv" inside the surrounding base stalk, binds well with hydrated calcium or lime. As it absorbs CO2 over years, or carbonates back to rock form, the hempcrete becomes very hard and a superior insulation. It is difficult to find it currently although some states have legalized its growth like CO in the USA. The only other option until states like this mass produce and figure out a cost effective way of separating the shiv from its outer fiber (stalk) is to import it from Europe which is not a reliable path I am finding, high embodied energy, requiring a long lead time, and high expense. All the elements a home builder like myself do not want to deal with. Question to the permies, and I am not knowledgeable about plants, is there another wood found abundantly in the USA that has a high silica property? I've read, although I have seen no documented proof, that the calcium replaces the silica over time (not that I understand exactly how that happens) and what benefit it is as a building product. There is also “light-earth”, needs the same support frame such as studs or sticks as hemp. It has been in existing a long time, woodchips with a clay binder I am thinking may be a more cost effective path in the USA just not sure it performs as well as hempcrete. The ability of high silica in hemp to remove CO2, improve indoor air quality and the atmosphere, harden like a rock and maintain good insulation properties is very appealing. Begs the question of the credibility of the amount of CO2 absorbed that you see on internet searches being real, and whether or not a domestic cellulose would perform just as well in strength and insulation? Thanks in advance for any comments.