New Zealand spinach

New Zealand spinach (Tetragonia tetragonoides) is a heat-loving plant belonging to the Aizoaceae family. Unlike common spinach, it thrives in warm weather and is native to the coastal regions of New Zealand and Australia.

Seeds should be sown directly in the open ground only after the soil has warmed up to at least +15°C and all danger of frost has passed. The seeds have a hard shell, so soaking them in warm water for 24 hours before planting is highly recommended.

In regions with shorter summers, starting seeds indoors in pots 4–6 weeks before the last frost date is advisable. Take care during transplantation as the plant does not react well to root disturbance.

Since the plant is a vigorous grower and branches extensively, space plants at least 50–60 cm apart. A single plant can spread up to a meter in diameter under optimal conditions.

Plant seeds at a depth of 2–3 cm. Germination can be slow and sporadic, so maintaining consistent soil moisture during the establishment phase is essential for success.

This crop prefers full sun exposure. It is highly adaptable to various soil types but performs best in well-draining, fertile sandy or loamy soils that can retain moisture during the summer heat.

One of the plant's unique characteristics is its tolerance to salinity. It can grow in coastal soils that might be slightly saline, where many other leafy green vegetables would struggle to survive.

While known for its drought resistance, regular watering is necessary for high-quality, tender leaves. In prolonged dry spells, the leaves may become bitter or develop a tougher texture.

Incorporating compost or well-rotted manure into the soil before planting will provide the nutrients necessary for rapid vegetative growth throughout the season.

The optimal temperature range for growth is +20°C to +25°C. The plant is extremely sensitive to cold and will be killed immediately by any freezing temperatures, requiring careful timing in temperate zones.

The harvest strategy involves continuous picking of the tender stem tips along with the leaves. You can start harvesting about 40–50 days after germination once the plant has developed a strong root system.

By regularly trimming the tips, you stimulate the plant to produce more lateral shoots, ensuring a steady supply of greens throughout the entire summer and early autumn.

Yields can be quite high, with a single healthy plant producing 1–2 kg of edible foliage over the season. Removing flower stalks as they appear will prevent the plant from going to seed too early.

The leaves contain significantly lower levels of oxalic acid compared to common spinach, making them a preferred option for those who enjoy fresh green salads or cooked vegetable dishes.

The greens are best consumed shortly after picking, as they are prone to wilting. If storage is necessary, keep them in a cool, humid environment to maintain their quality.

New Zealand spinach is notably resilient against many of the common pests and diseases that plague traditional leafy greens, making it an excellent choice for low-maintenance gardening.

Slugs and snails can cause significant damage to young, tender seedlings in the early spring, so protective measures should be taken until the plants are established.

If planted too closely together or in areas with poor airflow, the leaves may become susceptible to powdery mildew. Ensuring proper spacing is the best preventative measure against fungal issues.

Aphids might occasionally colonize the soft tips of the stems. Regular monitoring of the foliage allows for early detection, and pests can usually be managed with organic soap sprays.

Overall, the plant is remarkably robust, requiring little to no chemical intervention, which aligns well with organic farming and gardening practices.

Harvesting is done by picking the top 10–15 cm of the stems along with their leaves. This practice is beneficial as it encourages the plant to branch out and become bushier.

Regular harvesting cycles can continue until the onset of autumn frosts. The plant will continue to produce until the temperatures drop significantly below the comfortable growth range.

The best time to harvest is early in the morning when the water content in the leaves is highest, which ensures the best crisp texture and flavour profile for your kitchen needs.

The leaves are versatile in the kitchen and can be used raw in salads, blanched, sautéed, or incorporated into cooked dishes like soups, stir-fries, or savoury pastry fillings.

To keep harvested greens fresh for longer, place them in a sealed container or bag in the refrigerator. Proper moisture control is the key to preventing premature wilting and spoilage.