Purples and lime - lovely - a great combination of lavender, salvia, chives, etc.
Edging texture and colors for the gravel path and work plants into the terrace. Use some of the Russian Sage on terrace and in these beds.
How does your garden grow? With city gardens, the answer is with ingenuity. See the best small space garden ideas on HOUSE by House Garden - Gardening Lene
Buy Matteuccia struthiopteris from Sarah Raven: A brilliant ostrich fern which grows in shady, damp areas, and looks especially good planted with alliums
Kingham Hill House - Foxgloves, delphiniums, topiary, wisteria and Japanese maples.
Image 17 of 22 from gallery of Naman Spa / MIA Design Studio. Photograph by Oki Hiroyuki