As far as demiplanes go, Eustacius is not very large. It is more of a plane of thought, rather than
physical substance; a set of several dozen realms which are interconnected by concepts rather
than actual pathways.
A large bamboo like plant grow on a shoreline. Rather than growing round like conventional bamboo, this type of grass is shaped more like celery, and mature stalks just need the ends trimmed for ready made canoes.