Hi, we are building a garden bed along the front of our house in front of the windows. What kind of plants should I put here? I have considered two options here; small shrubs (lavendar) or grasses (dianella or lomandra). I don't want the plants to grow in front of the windows so need to consider the height of plants. Also I am unsure if I should consider using weed matting when planting and white rocks for top layer. Or if I should just fill with soil and once the plants are in, add mulch. Any advice would be appreciated.