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New Zealand YamOxalis tuberosaOka, Oca

2 Options from £4.50

Tender Tuber
What is Tender Tuber?
Plant that grows from an underground storage organ. Generally supplied in a
dormant condition with no top growth. Susceptible to damage
or death at temperatures below 5C.

Introduced exclusively by T&M

5 New Zealand Yam tubers £4.50 Out of Stock
10 New Zealand Yam tubers Save £2.50 £9.00 £6.50 Out of Stock
Please note: This product cannot be delivered outside the United Kingdom.
Description How to Grow More Info Delivery
  • Introduced exclusively by T&M
Also known as the New Zealand Yam, this unusual member of the Oxalis family has long been grown in the Andes for its nutritionally rich tubers with a tangy lemon flavour that becomes nuttier once cooked. The red skinned tubers have a crisp pale orange or creamy coloured flesh that can be eaten raw in salads or boiled, baked, and fried - just like potatoes. You can even add the attractive shamrock-like leaves and shoots to salads for a refreshing citrus twist. Oca makes a particularly attractive crop in the vegetable garden or even in a container on the patio. Height: 30cm (12"). Spread: 60cm (24").

Useful links:

How to grow Oca (New Zealand Yam)

Blog - Oca - the taste test

Patio, Kitchen Garden, Greenhouse


Full sun

Up to 30cm (11.8in)

Up to 60cm (23.6in)

A little experience

Easy for all

5 New Zealand Yam tubers (T15092)
10 New Zealand Yam tubers (T15091P)

Flowering Months Harvest Months

Water Oca regularly, particularly during dry periods and especially from mid September when tubers begin to develop. An occasional feed with a general fertiliser and a mulch of well rotted compost will also help to encourage strong growth.

Oca requires long day lengths to grow and will not initiate tuber production until day lengths shorten in the autumn. Some tubers may form on the stems and these should be harvested before the first frosts. Do not harvest the underground tubers until the foliage has become frosted and died back in late November and December. Carefully lift tubers taking care not to bruise them. Oca tubers can be stored for several months in a cool frost free shed. Do not exclude light as this will help to sweeten the tubers.

Pot up Oca tubers individually into 15cm (6") pots of good quality compost and grow them on in warm, frost free conditions. When all risk of frost has passed, plant Oca out in any well drained soil in full sun. For optimum tuber production grow Oca at a distance of 90cm (36") apart, and cover with fleece until fully established.


Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.90 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

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For your complete peace of mind, our Home and Garden products may be returned to us within 30 days of purchase for a refund of the purchase price. Items must be returned unused, at your cost and in mint condition. All items carry a manufacturer's 12 month defects warranty.