It actually has a high success rate. The seeds sprouted in more than a week, but for some reason not as much in the shade. They have a protective coating with a blue powder, most likely copper sulfate to prevent fungi before germination. The soil needs to be loose, if it's compacted they don't develop as well. It needs to be watered deeply to establish a strong root system and better growth. For about 50 square meters, I needed 2 packages and maybe I'll get a third one to plant in the spring because some areas haven't been covered.