CALTHA palustris

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CALTHA palustris

Kingcup, Marsh Marigold, May-Blob, Meadow Bright, Souci d'eau
Select Item No. CA044

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The conversion of seeds/gram is determined by the average weight of 1000 seeds and is rounded up to 2 positions after the decimal point. The number of seeds delivered may differ from the number ordered.



Plant Description

Life Cycle: Perennial
Family: Ranunculaceae
Origin: Northern Hemisphere
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
Growth Habit: clumping
Height with Flowers: 30 cm
Spacing between Plants: 30 cm
Soil Requirements: boggy
Location:
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!):
1300
Gram to get 1000 plants
(if sown directly into pots etc. you will need a larger quantity):
4 Gram
Plug tray recommended size(s): open flats
Sowing Direction:

(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.
It is beneficial to cover the sowing with snow during the cooling-period. The temperature below it usually keeps in the optimum range of –4 to 0°C [25 to 32°F]. The sowing is kept moist, and the melting snow helps to destroy the shell, which is advantageous for the germinating seedling. After this cooling-period the sowing may not be immediately exposed to high temperatures. The most effective temperatures are between +5 to +12°C [41 to 54°F], even if germination has started. The best location for this sowing, even in March, April and May, is the open field, the cold frame or a cold greenhouse.

(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)
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