Safehouse Garden is an option for Safehouse Room A. You can buy the receipt from Bits and Pieces in Solitude.
Requires Legacy Safehouse Plus.
Version 6 update: Legacy Safehouse Plus has been integrated into Legacy of the Dragonborn SSE and should NOT be installed as a standalone mod.
Garden Room A
If you buy the "Safehouse Garden of Kynareth Receipt (A)" (7448 Gold), it will be automatically added to the Household Planner in the Master Bedroom. Here you can set up the room to contain a beautiful peace garden featuring many native plants and shrubs as well as a working fountain and a Shrine of Kynareth.