a rectangle shape side of house garden with these plants: Back row (closest to house) β All around 2-3 ft tall: Little Lime Hydrangeas (not full-size Limelights) β Stays around 3 ft, perfect size. Double Knock Out Roses β About 3 ft, dense and full of flowers. Middle row (slightly layered in front, but similar height to give a βfullβ look): Spirea 'Little Princess' β 2β2.5 ft tall, mounds out really nicely. Lavender 'Hidcote' β Around 18β24 inches, so it gives you a soft lower layer without being flat. Front edge (super low, 1β1.5 ft): Dwarf Catmint 'Walker's Low' β Soft and a little sprawly but very controlled; gorgeous under roses and hydrangeas. Creeping thyme (optional if you want to sneak in some groundcover between rocks). See more