I'm at total novice. I've just dug out my front garden beds (nothing therejust weeds) and planted large individual box plants like the balls in the picture. What do I do with the space inbetween though - garden is north facing and gets west evening sun only. Is bark naff- I've seen lavender online but does it need sun and does it die in winter. I'm going for a clean architectural look. Sorry I'm clueless!