The Doctor's TARDIS contained several gardens within its inner bounds. (AUDIO: No Place Like Home)
The First Doctor gave Barbara Wright and Ian Chesterton a tour of the TARDIS, showing them one of the TARDIS gardens. (COMIC: In-Between Times)
The Sixth Doctor searched one of the gardens for a Kymbra Chimera that invaded the TARDIS. (COMIC: Changes)
Of them, one large garden was designed by the Doctor using Block Transfer Computation, and needed to be tended. It contained bougainvillaea, Draconian myrtle hedges and Vendican bladder-pods, plus a stream and set of swings. The Eighth Doctor said he once allowed an entire incarnation to pass without maintaining it. Charley called it the Doctor's 'pride and joy'. (AUDIO: Scaredy Cat)
During the time when Jason and Dr. Who controlled the TARDIS, Jason almost drowned Wolsey in the garden's pond. (PROSE: Head Games)