Sea Kale Mix Seeds

Sea Kale Mix Seeds - Crambe maritima

Crambe maritima

Hardy to Zone 4
Full Sun
Germination Tested Cut test: 80%

Approximately 25-30 seeds per packet

$5.50 CAD

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Sea kale is an essential perennial vegetable- the whole plant is edible! The most commonly eaten parts are the unopened flower buds that look and taste like small broccolis, and the spring shoots, which are often blanched with a bucket to make them more mild and tender. The young leaves are also delicious, and can be used similarly to kale. Plants produce masses of honey-scented flowers that make a beautiful edible garnish, and the unripe seed pods that follow can be used like peas. The root of plants that are at least two years old can be dug any time of year and roasted or boiled. Talk about a useful vegetable!

These seeds include genetics from many different sources. There are green and purple plants, improved varieties, and cold-tolerant selections from several growers in the US and Canada.

Sea kale is native to European beaches and likes a sunny position and well drained soil. I find it grows well in normal garden soil with regular additions of compost. Plants take a few years to get large enough to withstand harvesting, eventually reaching 2-3 feet wide (they may grow larger if not harvested much).

Propagation by seed is a bit tricky- the seeds require a long germination period. I find it works best to sow outdoors in pots in fall. The seeds also must be cracked open before sowing. See detailed growing instructions below.

Sea kale is most easily propagated by root cuttings taken in the fall through winter as weather permits, and planted immediately. For places with cold winters (i.e. below zone 6) root cuttings can be stored in the fridge in moist media and planted in spring. Plants grown by root cuttings can be lightly harvested starting the year after planting.

Growing Instructions

Sea kale seeds require a long cold stratification period to germinate. I find fall-sowing has the best results so seeds get several months of cold outdoors. If you don't have good germination- keep the pot and let it go through another winter outdoors.
Alternately you could try stratifying in the fridge for 3+ months.
Crack each seed open with nail clippers before sowing to help them sprout. You can either completely remove the seed from the corky shell, or just take a chunk of the shell off.

Shipping & Returns

We ship seeds via Canada Post within Canada for $6 to $8 depending on weight, and Internationally for a flat rate of $20*. Shipping costs to the US will include the cost of a phytosanitary inspection and certificate, as well as tariffs.

Live plants, bulbs, and bulbils can only be shipped within Canada.

Shipping fees listed here are in Canadian dollars, and may change without notice.

Shipping in Canada

We ship seeds in Canada via regular letter mail, which is an untracked service, and usually takes 1-3 weeks to arrive once we fulfill your order, but occasionally orders take longer, especially to the Eastern provinces and rural areas.

Customers can now opt for tracked, express shipping options at checkout if you require faster delivery.

Larger bulbs and plants are sent via tracked flat rate box.

Shipping to the US

Shipping charges to the US will also now include a government phytosanitary inspection and certificate. This will be bundled into the shipping cost. We ship via Canada Post, and any applicable duties will be calculated at checkout. So far (as of Sept 1, 2025), it's looking like there are no duties charged on seeds.

Please expect delays for US shipping, as during busy times it can take up to 2 weeks for us to book a phytosanitary inspection.

Shipping Internationally

International customers can select tracked or untracked shipping at checkout. The package will list the contents as "Garden Seeds". It is your responsibility to ensure you have the required import permit. We are not able to send any live plant materials internationally. Cicada Seeds will not be responsible for any orders held or confiscated by customs, or for any additional duties or tariffs placed on your order.

International shipping countries include: Austria, Belgium, Czechia, Denmark, Finland, France, Germany, Hong Kong SAR, Ireland, Israel, Italy, Japan, Malaysia, Netherlands, Norway, Portugal, Singapore, South Korea, Spain, Sweden, Switzerland, United Arab Emirates, United Kingdom.

This list may change without notice. Sometimes Canada Post will not allow us to ship to certain countries due to wars or natural disasters, see this page for delivery service alerts: https://www.canadapost-postescanada.ca/cpc/en/our-company/news-and-media/service-alerts.page

Please reach out if your country is not on this list, email us and we will try to arrange an alternate shipping option.