Beach Mustard / Sea Rocket
Cakile edentula, C. maritima
Also known as: Sea Rocket, Beach Mustard, Sea Mustard
'Cakile' derives from the Arabic name for the plant, 'kâkile', used in medieval herbalism. 'Maritima' means 'of the sea' in Latin, referencing its coastal habitat. The common name 'rocket' is shared with the culinary herb and reflects the spicy, peppery flavour. Sea rocket is a succulent, sprawling annual or short-lived perennial that colonises sandy beaches, coastal dunes, and the upper strand-line – often growing right at the edge of the beach where few other plants survive. Introduced to Australia from Europe and North America, it is now widespread along southern coasts. It belongs to the mustard family (Brassicaceae), evident in its cross-shaped, four-petalled pink or lilac flowers.
When to Forage
Available year-round in temperate coastal areas; most vigorous in spring and early summer.
Cautions
Generally safe in moderate quantities. As a member of the brassica family, those with thyroid conditions should moderate intake of raw sea rocket (goitrogens present). Safe for most people when eaten in culinary quantities.
Nutrition
Contains vitamin C, vitamin K, beta-carotene, folate, and glucosinolates (the same pungent sulphur compounds found in mustard and radish, with antioxidant and potential anti-cancer properties). Provides small amounts of calcium, iron, and potassium. The seeds are rich in oil and protein.
How to Identify
- Low-growing, sprawling plant with fleshy, lobed or wavy-edged, succulent leaves; grey-green in colour.
- Four-petalled flowers, pale pink to lilac, in small clusters at stem tips – typical of the mustard family.
- The fruit (seed pod) is the most distinctive feature: a two-segmented rocket or torpedo shape, with a lower cylindrical segment and an upper arrowhead or notched segment that detaches at maturity.
- Crushed leaves have a pungent, mustardy, slightly salty smell.
Lookalikes
Warrigal greens and relatives may grow nearby but have distinctly different fleshy, triangular leaves and no mustard scent. No toxic lookalikes are common on Australian beaches.
How to Forage
Harvest young leaves and stem tips with fingers or scissors. The young seed pods, before they fully harden, can also be eaten – they have a fiery, horseradish-like bite. Pick from areas well above the high-tide mark and away from boat ramps or areas of heavy foot traffic. Wash thoroughly.
Recipe — Sea Rocket Salad with Coastal Greens
Ingredients: 1 large handful young sea rocket leaves and tender pods; 1 handful other mixed coastal greens (e.g. sea celery leaves, warrigal greens); 2 tbsp good olive oil; 1 tbsp lemon juice; 1 tsp agave or maple syrup; salt and pepper; 2 tbsp toasted sunflower seeds. Method: Rinse the sea rocket leaves well under cold water and dry. If using warrigal greens, blanch briefly in boiling water for 1 minute, refresh in cold water, and squeeze out excess moisture. Toss all the greens together in a bowl. Whisk olive oil, lemon juice, agave, salt, and pepper into a dressing, dress the salad, and toss gently. Scatter toasted sunflower seeds over the top and serve. Also try: a quick mustard/horseradish condiment – rinse a cup of sea rocket and blend with a splash of vinegar, salt, and pepper to taste, then serve as you would mustard or wasabi alongside tofu, tempeh, or your favourite protein.
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