Our native cardinal flower, Lobelia cardinalis is simply on fire in the garden now, with spikes reaching 5-6′ tall.  As you can imagine, the hummingbirds are enjoying the tasty treat.  Moist to wet, organically rich soils grow the tallest plants, although cardinal flower also grows in typical garden soils but just doesn’t get as tall.  I can’t imagine a summer garden without this beauty.