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|Distinction:||Award of Garden Merit (A.G.M.) from the Royal Horticultural Society.|
|Special Features:||The beloved flowers - the color of butter - and the glossy green heart-shaped leaves, once used in salads by early settlers in the USA. A plant perfectly suited for stream banks or at the edge of pools. Plant of the Year 1999 in Germany.|
|Historical:||Pliny and Virgil commonly used the name Caltha for yellow flowers, possibly for Caltha palustris. Palustris indicates that it is from moist areas.|
|Basic Colour:||(yellow / gold)|
|Flower Colour:||deep yellow|
|Natural Flowering Period:||April - May|
|Winter Hardiness Zones:||Z3 - Z7|
|Foliage:||heart-shaped, shiny green, toothed margins|
|Height with Flowers:||30 cm|
|Spacing between Plants:||30 cm|
|Characteristics:||toxic plant / medicinal plant|
|Usage:||honey-bee food plant / water or marshplant|
|Portion weight:||0.176 Gram|
|Grams per 1000 seeds:||0.76923 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):
|Plug tray recommended size(s):||open flats|
(2) Most species of the Ranunculus-family need lower temperatures during the cooling-period – about –5°C [23°F]. In other respects follow the directions in 1. above. The reason is probably the freezing point of these seeds, which is at –7°C [19°F], while most other seeds freeze at –5°C [23°F].
(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.
(3) These species usually show excellent results if sown soon after the harvest, although most of them only germinate in spring after the effect of winter. For best results please order seeds in time.
(18) See 17. Allow the seed trays to be left for only 2–4 weeks at warm temperatures, then keep at 0°C [32°F] for another 4–6 weeks. It does not matter if the water freezes. After this treatment allow temperature to rise gradually.
(17) Waterplants must be sown in waterproof plastic trays or similar containers containing a nutritious muddy compost. Fill water up to 1 cm over the top of the compost. Keep the trays at warm temperatures of approximately +22°C [72°F].
|Sowing to Germination:||10 - 12 weeks|
|Germination to Transplant:||4 - 8 weeks|
|Transplanting to Potting:||6 - 10 weeks|
|Container Size(s):||1 plug per 8/9 cm (3 1/2") / 1-2 plugs per 11/12 cm (4 1/2")|
|Fertilizer:||Medium (150-200 ppm)|