We've recently moved house, and this north-facing border is in front of our bay window. It was filled with large untidy shrubs which the surveyor advised us to remove. My DH planted some yellow flowering plants (sorry, can't remember the name) in August, but they haven't exactly thrived. Neither of us are experienced gardeners. We need some recommendations for low level, colourful, but easy to maintain plants that will look good all year round.