Rather than harvest the wild one, I suggest growing a very close relative. Container Growing Kale. Kale will grow in a 6-inch (15cm) container. I enjoy eating it throughout the long kale season, but kale that is exposed to frost will have a sweeter flavor. For this reason, it’s often referred to as winter kale. Kalettes require high fertility and a long growing season. Kale will grow from early spring until early winter and it even favors temperatures that get down to 20 degrees Fahrenheit (-6° C) or so. Kale is usually grown as as an annual plant, harvested after one growing season and can reach a height of 1 m (3.3 ft). A single, fully-grown kale plant will need a container that is about 12 inches (30 cm) deep and equally wide. Hardy kale is the most reliable crop of the cabbage family. Harvesting . Move kale grown in containers into the cool shade when the weather warms to extend the season. Their flavor is mild and nutty, growing sweeter after frost. Pests. Kalettes, also known as BrusselKale and Lollipop Kale, have tall erect stems ringed with small rosettes of kalelike leaves. It stands up to frosts with ease and thrives in just about any well-drained, fertile soil. Kale Pests and Diseases. Give it a sunny position in order to encourage stronger growth during the dark winter months. There are a number of perennial kales often known as cottagers kale: Daubenton kale, Taunton Deane kale… https://gardeningtips.in/kale-seed-germination-temperature-time-process Seeds become less viable as they age, germination rates drop down incredibly. Like cabbage, kale grows best when well-fed. Fill the pots about 3/4 full with the same growing medium you used to germinate the seeds. How to grow kale from seed in hydroponics: Kale Seeds germinates finest at temperatures between 60 and 75 degrees Fahrenheit, they can be germinated at lower temperatures, as low as 40 Fahrenheit but much slower and with a lower germination success rate. 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