Chia

Chia is an ancient Aztec pseudocereal in the mint family, grown for its highly nutritious seeds rich in Omega-3 fatty acids, protein, calcium, iron, and vitamin C. Plants grow 40–80 cm tall and produce striking blue flower spikes 10 cm long that develop into seedheads bearing small, shiny brown seeds. It is a warm-season annual that requires frost-free conditions, performing best in subtropical and tropical climates with full sun and fertile, well-drained soil at pH 5.5–7. In Nordic conditions it must be grown in a sheltered, warm microclimate or polytunnel.

Growing

Sow seeds direct into warm soil once soil temperature reaches 25–27 °C. Cover fine seeds very lightly — no more than 2 mm — firm down gently, and keep the surface evenly moist until germination, which occurs in 5–14 days. Space plants 30 cm apart in fertile, well-drained soil in a full-sun position. In cooler climates, start seeds indoors under heat where soil temps can be maintained at 25 °C and transplant once outdoor night temperatures stay reliably above 15 °C.

Care

Pinch out growing tips when plants reach 20–25 cm to encourage branching and a heavier seedhead set. Water consistently but avoid waterlogging — chia is drought-tolerant once established. Apply a balanced fertiliser at planting; avoid excess nitrogen, which promotes leafy growth at the expense of seed production. The plant is naturally heat- and pest-resistant, so pesticide input is rarely needed.

Harvest

Monitor seedheads closely once the flowers fade and the calyces turn brown and dry. Harvest when the majority of seedheads are fully dry and seeds are visibly firm and brown. Cut seedhead stems, place them in paper bags, and hang upside down in a dry, airy spot. Once fully dry, separate seeds from stems by rubbing, then winnow in a light breeze or with a fan to remove chaff.

In the kitchen

Chia seeds have a mild, nutty, slightly spicy flavour and absorb up to 12 times their weight in liquid, forming a gel. Add raw seeds to smoothies, yoghurt, porridge, or baked goods, or soak in liquid for 15–20 minutes to make chia pudding. Use as a vegan egg substitute (1 tbsp seed + 3 tbsp water per egg). Seeds can also be sprouted as microgreens for a fresh, crunchy garnish.

Storing

Store dried chia seeds in an airtight container in a cool, dark, dry place where they keep for up to 4 years. Soaked or prepared chia pudding keeps refrigerated for up to 5 days. Microgreens should be used within 3–5 days of harvest.