They replace any seeds that fail to germinate. The funny part is that we often aren t aware of carrying them around. We are actively responding to the vast amount of emails and Dm s that come our way.  Source: <a href=https://www.zenitas.com.au/building-homes-for-people-living-with-a-disability/>https://www.zenitas.com.au/building-homes-for-people-living-with-a-disability/</a>