What to fill 'black holes' with?
At this time of year there's some black topsoil showing in my garden and I really don't like it, I want a lush grown look all summer long(late summer the garden has filled out though quite well). I don't mean big empty spots, I have nice plants everywhere but I'm looking for suggestiongs for some quickly spreading, nice looking plants that could fill out those empty spaces between the "main" plants.
I live in South Finland, just to give direction about the climate. I appreciate any suggestions!