That's a really good question that I don't have a solid answer to at the moment. The specific type of composting I'm doing is two phase. First I'm doing an ana

That's a really good question that I don't have a solid answer to at the moment. The specific type of composting I'm doing is two phase. First I'm doing an anaerobic phase and then taking the output of that, pH balancing it if necessary, then feeding it to composting worms I've been breeding. Then I take the worm castings from them and bag that up. The initial source is really the problem. I'm taking local yard waste so it should be fine to redistribute locally, but sending it out further to other areas of the country could pose a problem. Ideally the anaerobic phase of the composting process should kill any invasive species in the compost, but maybe it won't. I know typically people go for an aerobic composting process and bank on the heat killing any pathogens in the compost.