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Plant Guide

Dahlia 'Alta Bishop'


Pronunciation: DAHL-ya
Family: Asteraceae
Common Name: Dahlia
Plant Type:
  • bulb, tuber, corm
  • perennial

Height to: 4'
USDA Hardiness Zones:
  • 30 to 20ºF ZONE 9
  • 40 to 30ºF ZONE 10
  • 50 to 40ºF ZONE 11

Bloom Description: blooms 2-4" (5-10cm) in diameter, single dahlia bearing striking red blooms with yellow centers. Great for flower arrangements
Bloom Season:
  • mid summer
  • late summer
  • early autumn
  • mid autumn

Sun Exposure:
  • full sun

Soil Type: humus rich, well drained soil
Pests and Diseases: aphids, stem borers, spider mites, caterpillars, earwigs, cucumber beetle, capsid bugs, flower thrips, planthoppers, and slugs, powdery mildew, impatiens necrotic spot, dahlia mosaic virus, smut, fungal leaf spots, soft rot, crown gall, blossom blights (especially gray mold) and tomato spotted wilt virus
Propagation: Take basal shoot cuttings from tubers started into growth in late winter or early spring in a greenhouse, and root under a plastic cover or a mist tent, with bottom heat. Alternatively, start clumps into growth in early spring and when shoots are 3/4" (2cm) long, divide clumps into two or more pieces, each with a shoot, and plant out 5" (13cm) deep after all danger of frost has passed. Sow seed of bedding dahlias in trays in early spring in warmth; harden off, and plant out when all danger of frost has passed.
Notes: In midautumn, preferably when the foliage has been nipped by frost, cut back stems to 6", and lift tubers, gently brush off the soil, and leave upside down to dry naturally. Dust with fungicide, then pack in boxes of vermiculite or dry sand, and store over winter in a well ventilated, frost free place. Check periodically for fungal infection, pare out any damaged tissue, and treat again with fungicide before placing back in storage. Source: The American Horticultural Society A to Z Encyclopedia of Garden Plants
USDA Heat Zones (days above 86ºF):
  • Less then 1 day ZONE 1
  • 1 to 7 days ZONE 2
  • 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
  • 150 to 180 days ZONE 10
  • 180 to 210 days ZONE 11
  • Greater then 210 ZONE 12

Submitted by: Pectiwiccan
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