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|Origin:||Eastern USA to Iowa, south to Texas|
|Special Features:||Yellow flowering racemes together with attractive, pest-free foliage. An easy-to-grow, low maintenance perennial.|
|Basic Colour:||(yellow / gold)|
|Natural Flowering Period:||June - September|
|Winter Hardiness Zones:||Z4 - Z10|
|Foliage:||pinnatifid, with 6 - 10 elliptic leaflets|
|Height with Flowers:||120 cm|
|Spacing between Plants:||90 cm|
|Soil Requirements:||dry / well-drained|
|Grams per 1000 seeds:||18.18182 Gram|
|Seeds per Gram
(does not correspond to the number of plants!):
|Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
|Sowing Rates/Trays:||2 - 3 per cell|
|Plug tray recommended size(s):||open flats / 72|
(1) Cold-germinators are still referred to as frost-germinators, although this isn’t quite correct. The sowing must be kept warm (about +18 to +22°C) [about 64 to 72°F] and moist for the first 2–4 weeks. After this period the sowing must be kept at a cold temperature (between –4 and +4°C) [between 25 and 39°F] for another 4–6 weeks. Colder temperatures of –5°C [23°F] are only advantageous for most species of the Ranunculus family. It is not so important if the temperature is higher or lower during the cooling period, but the cooling period has to be prolonged because the synthesis of the germination inducer, hormon-like acid, slows down or comes to a standstill.
(10) For these bigger hard-shelled seeds, mechanical damaging of the shell is helpful for quicker swelling. One method is to grind the seed in dry sharp sand. They can also be treated for several hours in a “softener” (Polyethylenglycol 6000), which is used for the production of plastic material.
|Best Sowing Date
(northern Hemisphere, Field condition):
|Sowing to Germination:||8 - 10 weeks|
|Germination to Transplant:||4 - 8 weeks|
|Transplanting to Potting:||6 - 10 weeks|
|Cutting back at Transplanting:||Not Necessary.|
|Container Size(s):||1-2 plugs per 11/12 cm (4 1/2")|
|Vernalization:||No vernalization required for flowering in the first year.|
|Forcing:||This species is not a suitable candidate for forcing.|
|Fertilizer:||Medium (150-200 ppm)|