Caryopteris divaricata (syn. Tripora divaricata) - BLUEBEARD

This perennial has unique, purple-blue flowers that appear from late summer to early fall. It dies back completely in the winter. The foliage releases an unpleasant aroma when crushed, which causes deer to avoid it. 

Caryopteris divaricata prefers loose loam and will tolerate some drought; good drainage becomes even more necessary when it's planted in more northern zones. Provides an unusual detail for drained flower beds, perennial borders, cottage gardens, and butterfly gardens.

Picture copyright : Alpsdake, Commons Wikipedia

Blooming Time: August to September
Size: 4-6' tall and 1.5-3' wide (our plants planted in soil in half shade get about 5-6' tall and 2' wide, narrow vase shaped clumps)
USDA Zones: 6 to 9
Culture: full sun, half shade, always well-drained soils (will not tolerate clay)
Moisture Needs: medium-moist to medium-dry
Origin: contested - Japan or the Himalayas
Deer/Rabbit Resistant: yes / yes
Attracts Butterflies or Pollinators: yes, bees, butterflies and other insects
Attracts Hummingbirds: no
Pot Size: square 3.5" x 5" deep pot