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Robinia pseudoacacia 'pyramidalis'

Pronunciation: Roh-bin-ee-uh
Family: Fabaceae
Synonym: Robinia 'fastigiata'
Common Name: Pyramidalis black locust
Cultivar: 'pyramidalis'
Plant Type:
  • trees, shrubs
Height to: 50 ft
Width to: 10 ft
USDA Hardiness Zones:
  • -10 to -20ºF ZONE 5
  • 0 to -10ºF ZONE 6
  • 10 to 0ºF ZONE 7
  • 20 to 10ºF ZONE 8
  • 30 to 20ºF ZONE 9
Sun Exposure:
  • full sun
Bloom Season:
  • late spring
  • early summer
Bloom Description: Pyramidalis black locust (robinia pseudoacacia) bear white, fragrant flowers, 3/4" long that are produced in pendent racemes. This cultivar does not flower freely
Soil Type: Moderately fertile, moist but well-drained soil; they will tolerate poor, dry soil.
  • Yes
Plant Perks:
  • Fragrant
  • Deer Resistant
  • Drought Tolerant
Pests and Diseases: Borers, caterpillars, weevils, scale insects, whiteflies, and leaf miners can be a problem, as can leaf spot, wood rot, canker, powdery mildew, verticillium wilt, and heart rot.
Propagation: Sow pyramidalis black locust (robinia pseudoacacia) seed in containers in a cold frame in autumn. Insert root cuttings or graft in winter. Remove suckers in autumn
Winter Sowing Zones: Zones 5-8
Notes for Identification: Pyramidalis black locust (robinia pseudoacacia) is a fast growing, suckering, narrowly columnar tree with upright, spineless shoots. Pinnate, yellow green leaves, to 12" long, have up to 23 lance shaped or elliptic to ovate, blunt leaflets. Main source: the american hort society a-z encyclopedia of garden plants
USDA Heat Zones (days above 86ºF):
  • 7 to 14 days ZONE 3
  • 14 to 30 days ZONE 4
  • 30 to 45 days ZONE 5
  • 45 to 60 days ZONE 6
  • 60 to 90 days ZONE 7
  • 90 to 120 days ZONE 8
  • 120 to 150 days ZONE 9
Seed photo: 0
Seed Label: 0
Located in: Trees, Shrubs
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