Perhaps @CrayonRosary@lemmy.world could help you out since they mentioned wanting to do the same. Or perhaps the dev. I know they’re pretty responsive to bug reports. It’s been ages since I actually did any programming so I’m not of much help I’m afraid.
One of the gas clouds the censer spits out spawns grass like the wand of regrowth. From the point of impact, it will expand and the grass area will grow for a couple of turns. The inner tiles will refresh and respawn if they’re trampled, as the area grows outward, so throwing items at those squares can net more dew and seeds. I think using a wand of blast should work as well.