Oyster shell meal is a fantastic addition to soil, especially for plants like calatheas, alocasias, and begonias.
NOTE: Shellfish allergen (oysters).
Use 1 tablespoon per gallon of soil, or use as a topdressing - simply mix into the top 1-2" of soil and water the soil surface to spread the effects.
1oz packet = 2 TB
8oz bag = one cup
16oz bag = two cups
Bags and pouches are home compostable :)