RUDBECKIA fulgida var. fulgida
Plant Description
Best Sowing Date (northern Hemisphere, Field condition): |
Anytime |
Sowing Time Hint: | Light-germinator, do not cover, night 18°C, day 26°C. |
Sowing to Germination: | 3 - 4 weeks |
Germination to Transplant: | 3 - 10 weeks |
Transplanting to Potting: | 4 - 6 weeks |
Cutting back at Transplanting: | Not Necessary. |
Container Size(s): | 1-2 plugs per 11/12 cm (4 1/2") / 2-3 plugs per 15 cm (6") |
Vernalization: | There is no current research on vernalization but a prudent recommendation for any perennial would be 6-12 weeks (a few might need 15 weeks!) at an average daily temperature of 40°F (5°C). Exposure to cold may not be necessary for flowering but might improve quality. |
Forcing: | There has been no research, but an obvious place to experiment - following vernalization - would be raising daytime temperatures to 60° - 65°F (15° - 17°C). Provide 16 hours of continuous lighting. During the short days of winter, provide a night interruption lighting of 4 hours between 10:00 p.m. and 2:00 a.m. Some later flowering species can be forced in 14 - 16 weeks and perhaps sooner at warmer temperatures. Further experiments are warranted. |
Fertilizer: | Medium (150-200 ppm) |