I've collected eggshells and crushed them manually for some paphs of mine. I've heard that calcium carbonate isn't water soluble, but I don't think it'll do much harm anyways.I use rain, snow, bog,...
Calcium would be good for Mexican pings.
Welcome to TerraForums — a long-running carnivorous plant community established in 2001. Register for free to join the conversation, ask questions, and connect with growers from around the world.