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Any seeds that are indicated as needing a period of warm stratification followed by cold stratification should be subjected to the same measures, but the seeds should additionally be stratified in a warm area first, followed by the cold period in a refrigerator later. Warm stratification requires temperatures of 15–20 °C (59–68 °F).
The remaining solids, called seed cake, are either discarded or used for other purposes. [1] Oil presses can be either manual or powered. The second type of oil press is the ram press, where a piston is driven into a cylinder, crushing the seeds and forcing out the oil. Ram presses are generally more efficient than screw presses.
Fresh seed of Pulsatilla species, including of Pulsatilla nuttalliana, germinates readily without stratification or pretreatment in about 3 weeks or slightly more. [27] Seed that has been dry-stored for some months will require a cool moist stratification for 60 days and then sprout at temperatures of 18 to 21°C. [ 28 ]
An edible seed [n 1] is a seed that is suitable for human or animal consumption. Of the six major plant parts, [ n 2 ] seeds are the dominant source of human calories and protein . [ 1 ] A wide variety of plant species provide edible seeds; most are angiosperms , while a few are gymnosperms .
[11] [12] The seeds of some milkweeds need periods of cold treatment (cold stratification) before they will germinate. [13] To protect seeds from washing away during heavy rains and from seed–eating birds, one can cover the seeds with a light fabric or with an 0.5 in (13 mm) layer of straw mulch. [14] However, mulch acts as an insulator ...
Rapeseed (Brassica napus subsp. napus), also known as rape and oilseed rape, is a bright-yellow flowering member of the family Brassicaceae (mustard or cabbage family), cultivated mainly for its oil-rich seed, which naturally contains appreciable amounts of mildly toxic erucic acid. [2]
Some seeds need stratification, (the cold treatment), which can be carried out indoors or outdoors. Seedlings are generally potted on (or transplanted) when they have 3 leaves. [ 64 ] Oncoyclus irises dislike division, but it should only be carried out when the plant is overcrowded. [ 62 ]
There are two subspecies, T. h. austropurpureum which has violet-purple flowers and T. h. pilosum with yellow flowers. [19] The Canary creeper (Tropaeolum peregrinum) is a trailing and climbing half-hardy annual species with wiry stalks and palmately lobed leaves. The pale yellow, fringed flowers are borne on long stalks.
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