This is my favorite all time perennial flower and it's called
Corydalis lutea and sometimes referred to as yellow bleeding heart, but it's not a bleeding heart. It's 18 inches tall with little yellow flower that bloom from April until October. Yes, a perennial that blooms like an annual. It loves dry shade, but will also thrive in full sun. It's indestructable, deer resistant and forms a small colony after a couple years. It's not invasive and spreads by seed. It can be hard to find, but I've seen it at local nurseries. I've spent all summer writing my next book, Tomatoes, Garlic and Basil, so the garden has been neglected. Corydalis lutea is one of those plants that makes my garden look nice, even though it's been growing wild.