Ellen and C.L. talk about the difference between raspberries and blackberries, give suggestions for plants that grow well in the tiny spaces in rock walls, and discuss whether you should panic when you see bugs on a plant. We end with a listener’s question about a perennial garden filled with early-summer bloomers.   :30 What’s For Dinner: Raspberries   6:32 Eat/Drink/Grow:  Plants to grow in Rock Walls  18:19 Plant Noob: What to assume when you see an insect? 22:24 Love Letters and Questions:  Leddy wonders if the perennials she bought in May can be brought into flower again.