Agastaches (a.k.a. Hyssops) & Salvias are definite hummer magnets. I only usually have 3.. 2 girls & 1 boy of the Broadtail variety, but that's what I grow to attract them. Some varieties of hyssops smell like root beer, extremely drought tolerant, VERY xeric, and are dummy proof! Gotta love 'em! Agastache cana is one of my favorites.. it's actually called Hummingbird Mint!
http://www.finegardening.com/d... Grows huge (I'll take pictures of mine tonight if I don't get home too late), easy to care for, awesome plant!
