Q&A: What is frass?

The BSF frass meaning refers to the organic residue left after Black Soldier Fly larvae process a substrate. This material consists of leftover feed, digested organic matter, and larval excretion. It plays an important role in sustainable agriculture as a valuable by-product of insect farming.

Frass is the leftover from the production substrate. In other words you started with several ingredients like for example spent brewery grain and pig manure. You then add larvae to that mix. After production, you separate the larvae from the remaining material. The remaining material, according to the BSF frass meaning concept, is called frass. The frass is an ideal organic fertilizer.

It’s also important when you make your business plan to include the income from the frass. This can be a significant part in your turnover.

In Europe the law (at the moment of writing this article) states that the frass needs to be steamed (70 degrees) for 1 hour to be allowed to sell as organic fertilizer.

Perhaps in general, the steaming would not be needed but now as an EU grower you don’t have a choice.