Black and blue salvia. Named for its blue flowers and black base, this annual is easily found in many garden centers in Wisconsin and is an absolute must for a hummingbird gardener.

The Pelargoniums are those (mostly) brilliant red flowered affairs your grandmother probably grew in pots in the summer and then overwintered on windowsills. They love the sun. They love the heat.

Petunia, zones 10 to 11, annual elsewhere. You might be surprised to see petunias on this list but note their tubular flowers that seem made for a hummer’s beak. There is a rare Brazilian ...