One of the spin offs of our garden is the distribution of seeds from our plants. Some seeds are difficult to obtain such as these from a Mammillaria specie (=cactus). After harvesting the seed capsules they need to soak for some days and when the tissue is soft it’s easy to remove. Next the seeds are dried and than a viability test is done. Indeed it can happen that all seeds are not viable but usually over 90 percent is.