Purslane

Purslane (Portulaca oleracea) has the highest omega-3 fatty acid content of any leafy green vegetable - roughly 300-400 mg per 100g serving, primarily as alpha-linolenic acid (ALA) (Simopoulos AP and Salem N, “Purslane: a terrestrial source of omega-3 fatty acids,” New England Journal of Medicine, 1986). That’s 5-7 times more than spinach. It grows in compacted, poor, dry soil where most vegetables fail. And it sells for $3-6 per pound at farmers markets where it appears at all (USDA AMS Specialty Crop Market News, 2023). The problem is that most gardeners spend significant effort killing it as a weed, which is a waste of both effort and an edible crop.

What it actually is

Purslane is a prostrate succulent annual native to North Africa and the Middle East, now naturalized throughout the temperate world. The species Portulaca oleracea is what you find growing uninvited in garden beds and sidewalk cracks - it’s the wild form. Cultivated varieties bred for larger leaves and upright growth (like ‘Goldgelber’ and ‘Gruner’ European varieties, or ‘Golden Purslane’) are more productive and more palatable than the wild form, which tends toward small, scattered leaves on prostrate stems.

The leaves and stems are the edible portion. The flavor is mild, slightly lemony and mucilaginous (similar to okra in texture when cooked, without the pronounced sliminess). The succulent quality comes from the water content and organic acids - primarily malic acid and oxalic acid, same as spinach. People who like arugula and mâche tend to like purslane. People expecting it to taste like lettuce are sometimes surprised by the texture.

The ROI case

A packet of cultivated purslane seed costs $2.49. In practice, if purslane already volunteers in your garden (which it does across most of the US), you can select the largest-leaved plants, let them set seed, and collect seed for future plantings at no cost. Wild purslane is edible - it just has smaller leaves and lower per-plant yield than cultivated varieties.

Cultivated purslane in a 4 x 4 foot bed yields 1-2 lb of fresh stems and leaves per cutting, with 2-3 cuttings per season. At $4/lb average retail, that’s $4-8 from a bed that requires essentially no irrigation beyond rainfall in most climates.

The nutritional premium - omega-3 content comparable to fatty fish on a per-calorie basis - drives farmers market demand. Buyers who understand the nutritional profile pay $5-6/lb readily.

Growing requirements

Purslane is warm-season only. It does not germinate in cold soil - wait until soil temperature is consistently above 65°F. In zones 5-7, that means late May. Direct sow seeds on the soil surface in full sun; seeds are tiny and need light for germination. Thin to 6-inch spacing when seedlings emerge.

It thrives in the conditions that stress other crops: sandy, low-fertility, dry soil is fine. Soil pH 5.5-7.5 - it’s not particular. High fertility and consistent water produce large, lush leaves but are unnecessary. Purslane’s drought tolerance is genuine - established plants survive weeks without rain in most climates.

Do not add high-nitrogen fertilizer. Excessive nitrogen produces rank, bitter-tasting foliage.

What goes wrong

Slugs are the primary pest on seedlings - they find young purslane more palatable than established plants. Protect young plants with diatomaceous earth or slug traps.

Root rot from waterlogged soil kills purslane despite its general toughness. The one condition it doesn’t handle is standing water. If your garden bed drains poorly, mound the bed or plant elsewhere.

Competing weeds - a common problem when you intentionally sow what most gardeners consider a weed - is really about confusion at the seedling stage. Cultivated purslane germinates in a more uniform, dense stand than the scattered wild type. Mark your sown area clearly.

Bolting in late summer produces viable seed and is not a failure - it’s how the plant perpetuates. Harvest before plants bolt for best leaf quality, or allow bolting and collect seed for the following year.

Harvest and storage

Cut entire stems 2-3 inches above ground level when plants are 6-8 inches tall. The plant regrows from the remaining stem and root for additional cuttings. Alternatively, harvest individual leaves and stem tips as needed - the plant tolerates selective picking.

Store harvested purslane stems in a glass of cold water in the refrigerator, like fresh-cut flowers. It holds for 5-7 days this way. Don’t seal in a bag without water access - it wilts quickly.

Purslane wilts to about half its volume when cooked. Use it raw in salads, as a substitute for spinach in cooked applications, or in Middle Eastern fattoush. The mucilaginous quality makes it a natural thickener for soups and stews in the same way okra functions.

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Related crops: Arugula, Carrot, Spinach

Related reading: Beginner Homestead Crops - crops that produce in marginal conditions where higher-maintenance vegetables fail