Plantd Is making ultra-strong building panels out of grass

https://singularityhub.com/2023/02/15/this-startup-is-making-ultra-strong-building-panels-out-of-grass/

"fastest-growing grass grows 20 to 30 feet harvested multiple times per year... cellulose fiber broken down, reconstituted and engineered such that final product even stronger than wood... stronger, cheaper, lighter, and more moisture-resistant than wood for the same cost... strength enables building homes using fewer 2X4's,, creating fewer gaps so better building's energy efficiency... using nine times less land  than trees require... $10 million funding from former SpaceX engineers"

Related:

Knots Smaller Than Human Hair Make Materials Unusually Tough

https://www.caltech.edu/about/news/knots-smaller-than-human-hair-make-materials-unusually-tough

Sandcastle worm nests inspire new low-carbon building materials

https://techxplore.com/news/2023-09-sandcastle-worm-low-carbon-materials.html