Indeed they are @sizzlingmonkeys. As with Banana circles the idea is that we plant them around a pit filled with organic matter so that as it breaks down it feeds the trees. This means we can feed and water all in one place and it builds up as a giant sponge. It also means that we can plant more trees in an area than if we planted in rows, but leave 80% of the area open for other uses. Ill be sure to write up about this and other tips and tricks. Thankyou!