i am visiting my family back home for 5 days, and have a question. my mom has a huge garden with tons of herbs and flowers. we live on farm land so we use dried manuer (cow poo) to mix in with the dirt/soil. my question is: would the manuer effect the plant/flowers to where they wouldn't be edible for the crabs?? i know the farm doesn't put any chemicals in the cow poo after it's out the other end. cow's have 4 stomachs so by the time it comes out. every impurity should be gone, Right? if the plants/flowers are safe from impurities then my crabs would be soooo happy with their dinners.