Not easy to develop a corner of greenery on a balcony apartment or house. Quick zoom to fix it ...
The question: "How to have a little color on a narrow balcony where it is impossible to move to water the planters?"
Mrs. Rivière, Creil (60)
Plant drought resistant species: fescue, cistus, helichrysum and sedum. They will be satisfied with the rain to live. And if you can water the planter in front of your window, sow a climbing nasturtium whose stems will wrap around the guardrail.