Floribunda A quick-change color show is what you get from this aptly named plant. Blossoms turn from purple (“yesterday”) to lavender (“today”) to white (“tomorrow”). And all colors are usually present at the same time on this 10-foot-tall plant. In small spaces, you can keep it to 3 feet tall with pruning, or grow a dwarf form. Zones 12– 17, 20–24; H1, H2.
Aster x frikartii Delicate-looking flowers on ultra-tough plants tolerate just about any soil type. ‘Mönch’ grows to 2 feet-tall and pumps out 2 1/2-inch lavender-blue flowers almost all year if spent ones are removed. ‘Wonder of Staffa’ is another favorite with lavender blue blossoms.
Hosta perennial hybrids Hostas come in a virtual wardrobe of shapes, textures, and colors. Depending on variety, their leaves may be heart-shaped, round, oval, or lance-shaped; glossy or dull; smooth or quilted; blue, green, or yellow. We especially love the cool, bluish green ‘Sagae’ (pictured); it grows 2 feet tall, and makes a stunning accent in a blue-green glazed container. The perennial also sends up white flowers in late summer.
The Best Drought-Tolerant Perennials ... Handy list of 15 hardy plants - many flowering varieties suited to hot dry summers. Includes lavender, yarrow, sages and echinacea (purple coneflower). | The Micro Gardener
Name: Lavandula x intermedia 'Phenomenal' One of the hardiest lavenders! This hybrid lavender flowers in midsummer, a little later than English types, and has exceptional winter survival.This lavender is ideal for cutting fresh for bouquets and sachets, and it also dries well. Lavenders prefer well-drained soil, so plant in a raised bed if your soil is claylike. Growing Conditions: Full sun Size: To 32 inches tall and wide Zones: 5-9 Grow It With: Roses