Seed Variety

Rudbeckia Goldblitz

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Data is gathered from our Elburn, Ill., trials (Zone 5a) for a North American audience. Warm-climate growers: expect 1-2 weeks earlier finishing. Cool-climate growers: expect 1 week slower. Dates based on standard 288 plug size.

Notes/Pitfall Management
Prefers slightly higher pH around 6.0-6.2. Use B9/Cycocel as necessary. Sumagic will make plants look abnormal. New leaves tend to curl/pucker upon flower initiation. Low humidity and high Calcium will reduce the severity. Plants will grow out of this and flowers will cover symptomatic leaves.
Week color desired
Sow week
Plug transplant week
(1 ppp)
(1 ppp)
Long day lighting required. Day extension to 16 hours or night interruption. Overwintered or short day treated plugs not necessary.
(1 ppp)
(1 ppp)
Transplanting after week 25 will greatly delay flowering and may not flower first season after week 28 transplant without night interruption lighting. Overwintered or short day treated plugs not necessary.
Seed Form: PRM
PlugSize: 288
Seeds/Cell: 1
Plug Crop Weeks: 6-8
Days from 50% to maximum germination: 2-4
Cover Seed: Light cover
Plug Production
Stage 1
Moisture: Level 5-4
Temperature: 72-77°F
Light: Optional
Fertilizer: Less than 100 ppm N
(Less than 0.7 EC)
Stage 2
Moisture: Level 4
Temperature: 68-74°F
Light: 2,000-2,500 fc
(21,500-26,900 Lux)
Fertilizer: 100 to 175 ppm N
(0.7 to 1.2 EC)
Stage 3
Moisture: Level 3-4
Temperature: 65-70°F
Light: 2,000-2,500 fc
(21,500-26,900 Lux)
Fertilizer: 175 to 225 ppm N
(1.2 to 1.5 EC)
Stage 4
Moisture: Level 3
Temperature: 60-65°F
Light: 2,500-3,500 fc
(26,900-37,700 Lux)
Fertilizer: 175 to 225 ppm N
(1.2 to 1.5 EC)
Vernalization: No
Propagation Key Tips: Goldblitz does NOT require SD plug treatment, NOR vernalisation for your Summer Sales program. For forcing info: See Perennials Forcing Guide.
Growing on to Finish
Growing on Temperature: (day) 65-68°F (18-20°C)
(night) 60-65°F (16-18°C)
Target Media pH/EC (1:2): 5.8-6.5 pH
1.2-1.5 mmhos/cm
Fertilizer: 175 to 225 ppm N
(1.2 to 1.5 EC)
Daylength: Obligate Long Day
Daylength Notation: Critical daylength of 14.5 hours.
Fertilizer Notation: Ensure sufficient availability of Ca during active growth to avoid growth tips burning due to Ca deficiency. Also ensure it has an active climate, allowing good transport of nutrients in the plant.
Bulking Strategy: No short day-grown plugs needed for annual finishing, but it is possible to do so.
Finishing Key Tips: Will finish reliably as a first-year-flowering perennial if not sown later than Week 16. No need for short day treatment of plugs (like Goldsturm does). For PGRs, use B-Nine 3x 5,000 ppm spray as an option for more controlled growth. B-Nine/CCC tank mix (3x B-Nine 2,500 ppm/CCC 750 ppm spray) could be an optional treatment. Using Sumagic or Bonzi spray is not recommended, as they made the foliage smaller and the plants looked spindly. This is a relatively high feeder, so prevent Mg, Ca and Fe deficiencies. High light and good ventilation are beneficial. Possible foliage issues can occur on new growth leaves (puckering, cup up, tip marginal burning) during flower induction period because of more difficult mineral transport during this developmental stage. There is no good fertilisation correction possible, only maintain as low an RH as possible with optimal ventilation to have optimal plant transport of elements. The foliage issue will mostly have disappeared at flowering sales stage. For Spring and Autumn forcing: See Perennial Forcing Guide.