The Secret Garden was originally the Victorian walled garden and is now home to the many friendly Powderham pets. Goats, guinea pigs, chickens, ducks, sheep, and stick-insects, to name but a few, live here in a blissfully happy environment and enjoy the company of visitors, children and adults alike. The Secret Garden is also home to Timmy 2, and his companion, Eliza - both Mediterranean spur-thighed tortoises, who have spent most of their lives in Devon.

The Garden is on a south-facing slope and has a glasshouse built by the architect Charles Fowler, which now provides a wet weather shelter for visitors and is used by the Estate to supply pinks to the Perfumed Garden, a lovely plant centre just within the Castle gates.

The Secret Garden is also home to the Courtenay Fort and a family picnic area.

The Secret Garden & Courtenay Fort are open from 10.30am; closing times will vary during the season, please check on arrival.