I love the smell and I enjoy tucking some into nearly every container in the summer. In Boston, you had to buy them before Memorial Day or they would be sold out, and I could never get them to sow from seed in time. (I could do it, but they would finally bloom in July or August!
Keep them well-watered and a little in the shade--they can fry easily. You're right, I think of them more in Maine than in Texas. And I think maybe the white ones are more fragrant or hardier than the colored--just a guess, though.
Oh, yeah you are right- the lavendar ones -or maybe sort of purple or slightly blue??? -- well anyway the are not as hardy as the white one.
So, if I want to baby 'em I can keep them all summer long.
Sigh~ I not sure I want to baby them - but they are so pretty - mass of low growing blooms in the early summer.