Growing New Zealand Yams: A Guide to Cultivation and Harvesting

If you're looking for a new crop to add to your garden, consider growing New Zealand yams. These root vegetables are easy to cultivate and offer a unique flavor and texture that is sure to impress. In this guide, we'll walk you through the steps of planting, caring for, and harvesting your own New Zealand yams.

What Are New Zealand Yams?

New Zealand yams, also known as oca or oxalis tuberosa, are a type of root vegetable that originated in South America. They were brought to New Zealand by British colonizers in the 1800s and have since become a popular crop in the country. The tubers are small, oblong-shaped, and come in a variety of colors ranging from white to pink to purple.

Choosing a Growing Location

New Zealand yams require a well-draining soil with plenty of organic matter. They prefer a slightly acidic soil with a pH between 5.5 and 6.5. Choose a location that receives full sun or partial shade, depending on your climate. In colder climates, partial shade can help protect the plants from frost.

A garden bed with rows of New Zealand yam plants

Planting Your New Zealand Yams

New Zealand yams are typically planted in the spring after the last frost has passed. Plant the tubers about 2-3 inches deep and space them about 8-10 inches apart. Water the plants regularly, but be careful not to overwater as this can cause the tubers to rot.

Caring for Your New Zealand Yams

As your New Zealand yams grow, they will need regular watering and fertilization. You can use a balanced fertilizer every 4-6 weeks during the growing season. Be sure to keep the area around the plants weed-free to prevent competition for nutrients and water.

A close-up of New Zealand yam plants with healthy leaves

Harvesting Your New Zealand Yams

New Zealand yams are ready to harvest in the fall, usually around late May to early June in the southern hemisphere. Wait until the leaves have died back before digging up the tubers. Use a garden fork to gently loosen the soil around the plants and then carefully lift out the tubers. Be sure to save some of the smaller tubers for replanting next year.

A basket of harvested New Zealand yams

Preparing Your New Zealand Yams

New Zealand yams can be cooked in a variety of ways, including roasting, boiling, or frying. They have a slightly sweet, nutty flavor and a crunchy texture when raw. Try using them in place of potatoes in your favorite recipes or experiment with new flavors and seasonings.

A plate of roasted New Zealand yams with herbs

New Zealand yams are a delicious and easy-to-grow crop that is sure to add something special to your garden. Whether you're a seasoned gardener or just starting out, give these tasty tubers a try and see what delicious dishes you can create!