A Farmer's Fence series is a collection of 16 enclosures (units) based on themes meant for young learners of English at the level of Grade 1.
The series emphasizes conversation and has no intention to teach grammar. This is the inductive approach to learning a language.
The Farm, Enclosure 16, is the final enclosure (unit) in the series. It talks about gardens, garden plants, farms, farming, and farm animals.
At the same time, the language develops more and it introduces new words and expressions in context.