Maybe I should qualify that ~ not "frost proof" but rather ~ able to withstand a light frost.
All the more important to those who've already experienced their first one (like me) & are seeking "leftover" color in the garden.
Borage officinalis (aka Starflower) pulled thru with no problem:
Calibrachoa's always surprise me with their hardiness. This one is 'Double Lemon:'
Snapdragons pop up early and leave late ~ perfect annual traits. Below 'Twinny Peach' totally unfazed by cooler temperatures:
Verbenas are workhorses all summer long so it shouldn't be surprising that cold doesn't bother them. 'Lanai Peach:'
The bees are happy Malva sylvestris isn't afraid of a little chill:
Finally, Phygelius aequalis 'Yellow Trumpet' (aka Cape Fuchsia) has proved a survivor too.
so much so, I'm considering wintering it over. Better hurry & decide ~ the warm up is most likely temporary...
p.s. Feel free to add your "frost resistant" annuals to my list ~ I'm always on the lookout for blooms that extend the growing season!