Seed germination, sowing instructions for Sea kale. Crambe maritima is easy to grow from seeds. Sea kale is a very hardy perenial and tolarates different conditions. Germination can be slow so it is best to sow the seed in pots. Germination usually takes place in 3 - 5 weeks at 15 degrees C. Prick out the seedlings into individual pots as soon as they are large enough to handle and plant out into their permanent positions.
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