| Hi Rachel, I had six or seven daiffodil plantings pop up among my vinca at my previous house. It was very pretty in the spring. You do then have to accept the die-back of the foliage, but I thought it actually looked oay. I didn't add any summer flowers before I moved. Astilbe might be nice, but I wonder if a flower with less foliage might look best. Vinca can really take over any area; that's why I wonder. Some allium might grow in the shade. I'll try to see which ones and get back to you. | 
