pf2e.fyi
From Pathfinder Rage of Elements, which isn't enabled.

Stalagmite Seed

ITEM 7
Price 60 gp
Usage held in 1 hand
Bulk L

Activate (manipulate)

You can throw a stalagmite seed, use it as a sling stone, or pack it into firearm ammunition. When you use the seed, you aim it at a 5-foot square rather than a specific target. Stalagmites of assorted sizes erupt in the square the seed lands in, dealing 6d6 piercing damage to any creature within that space (DC 23 basic Reflex save). The stalagmites remain for 1 minute, creating difficult terrain in that space, before they crumble into dust.

Pathfinder Rage of ElementsOGL