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Mimulus / Monkeywort Tiny
Mimulus minimus. Say that five times. You know the yellow trumpets on the large, annual flowers so take that image and shrink it, but keep the “blooms all summer” part. Although we list this as a hardy perennial, it acts more like a self-sowing annual but the most important tip is to keep it watered. Forget that once or twice and you've got singed edges.