Vegetative Variety

Penstemon barbatus Rock Candy®

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Data is gathered from our West Grove, Pa., trials (Zone 6a). Southern growers: expect 1-2 weeks earlier finishing. Northern growers: 1 week slower. Consider summertime scheduling accurate. Dates based on a standard 72 liner size.

Week color desired
URC stick week
Liner transplant week
Spring/Summer
 
Gallon
(1 ppp)
 
 
 
 
Week color desired
URC stick week
Liner transplant week
Late-Summer/Fall
 
Gallon
(1 ppp)
 
 
 
 
*Plantings after week 25 finish faster
Penstemon barbatus Rock Candy® Purple
Penstemon barbatus Rock Candy® Blue
Penstemon barbatus Rock Candy® Light Pink
Penstemon barbatus Rock Candy® Pink
Penstemon barbatus Rock Candy® Ruby
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Propagation Guide
Media EC/pH: EC 0.75-0.80 mmhos/pH 5.8-6.2
Soil Temperature: 70-72°F (21-22°C)
Rooting Hormone: 500 ppm IBA
Mist: Moderate to high for first 24 hours, then reduce to low.
Fertilization: 50-75 ppm N
Pinching: Recommended.
Transplanting: 35-42 days after sticking
Comments: Use low mist settings; do not oversaturate rooting media. Root zone temperatures of 70°F (21°C).
Finishing Guide
Media pH: 5.8-6.2
Temperature: Nights: 55 to 70°F (13 to 21°C) Days: 60 to 80°F (15 to 27°C)
Light Level (fc): 3,000 to 5,000
Vernalization: No
Daylength: Long day facultative
Watering: Allow media to dry moderately between watering.
Fertilization: Use a balanced fertilizer at a rate of 150 to 175 ppm N.
Pinch After Transplant: Yes
Plant Growth Regulators: PGRs generally not needed
Pests and Fungal Diseases: Spider mites, thrips. Watch for INSV/TSWV.