Blooms in midsummer with elegant slender spires of lavender-blue tubular flowers. Finely divided grey-green leaves are aromatic when crushed. Perovskia has one of the longest bloom times of any blue-flowered plant. Semi-woody shrub emerges slowly in spring; cut back after frost.
Tolerates drought, loves heat and full sun, can’t bear standing water. Likes to spread out once it gets established, and it is so beautiful it deserves every foot of space it can get! Plant 24-36" apart. I suspect that Zone 4 reports of winterkill are from poor drainage rather than cold, so a cautious Z4. (bare-root crowns)
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Herbaceous Perennial Plants
When you receive your order, open the bags and check the stock. Roots and crowns should be firm and pliable. Generally, a little surface mold is harmless and will not affect the plant’s future performance. If they are slightly dry, add a little water or, if they are going to be planted or potted up soon, wet the roots. If you do not plant or pot them up immediately, store them in a cool (35–40°) location for a short time.
Do not plant bare-root perennial plant crowns directly outdoors before danger of frost has passed. Wet and/or cold conditions for an extended period may cause rotting.
Pot up rootstock using well-drained potting mix in a deep 6" pot or a 1-gallon container. Avoid coiling the roots in under-sized containers. Grow newly potted perennials for a few weeks in a protected location in indirect light at 50–60°. Transplant outside once they show some top growth and the danger of frost has passed.