Perovoskia are loose airy sub shrubs with gray foliage and lavender blue flowers. Longin is a narrow more upright Russian Sage cultivar.
Pronunciation
(per-OFF-skee-uh)
Plant Type
All Plants, Perennials Hardy
Hardiness Zone
5
Sunlight
full
Moisture
average
Soil & Site
average, can't tolerate wet soils especially in the winter, this is sure death
Temperature
top parts of the plants are killed with light frosts
Flowers
tubular lavender blue flowers borne in terminal racemes or panicles, airy
Leaves
fragrant when crushed (especially when I prune the plants), whitish gray in color
Stems
square stems typical of the Lamiaceae family
Maintenance
best not to cut flush with the ground, I like to leave 6 or more inches of stem, this is where the new buds will form for the next growing season, also I will periodically prune back some of the branches to help prevent the "Perovskia Flop" which is common to this group
Propagation
cuttings
Native Site
Russian Sage is not native to Russia but is found in Afghanistan & western Pakistan.
Misc Facts
The genus is named for VA Perovskia a Russian general.
Author's Notes
I really like to use this perennial for the whitish gray foliage and flower color. The lose ariness of the plants allows for plants to grow up and through the plant. At a Perennial Plant Association convention in Minneapolis, Minnesota USA, I saw Perovskia inter planted with Echinacea, a combination I still use today. When the Magnolia start dropping their petals (really tepals) I call this "Magnolia Snow". When the Perovskia start dropping their petals the area around the plant is littered with bluish petals or "Perovskia Snow".
Notes & Reference
#79-Perennials For Every Purpose (Larry Hodgson), #144-Missouri Botanical Gardens web site (www.missouribotanicalgarden.org)