Salvia Species, Blue Vine Sage, Guatemalan Sage

This Salvia has lovely true blue flowers, plus interesting foliage, and it can take quite a bit of shade. I agree that it is a bit free-...Read Moreroaming and sprawly and so is best in an informal, cottage garden setting. -I do not find it invasive though; it just needs a little attention paid to it so it does not get out of bounds.

This is an attractive plant with intense little blue-to-indigo blossoms the year round. It's quite vigorous, sets down roots where the st...Read Moreems touch down, and also sends out runners close to the center of the plant. It's not a controlled, perfectly-well-behaved plant, but occasional pruning keeps it in check.

Ivy Leaf Sage has a sprawling habit with pretty blue flowers, leaves similar to ivy. Full sun, good ground cover.