September or in early October, provides them with plenty of compost and a healthy dose of moisture, and covers them with protective cloth if a late frost is looming. The family enjoys the waxy harvest over Christmas and New Year, boiling the deepeyed potatoes in their skins after a quick brush, and pan-frying any leftovers for tea. Andrew is careful to protect the following year’s seed tubers by carefully storing them in a rodentfree, dry box until required in early spring, at which stage there is always the hope that an extra-large potato may result (he once grew a ‘Tiptree’ that was more than 15cm long and 3cm wide). As for Nicola, she is equally keen to learn more about the ‘Tiptree’. Having spotted a photo of it in the February 2020 issue of Kiwi Gardener (where it was described as ‘unnamed heritage potato from the Kaikōura coast’) she now wonders how many other gardeners in the Kaikōura region also have the potato, and if there are Lilley relatives still living in the Rangiora area. If you can help her with that information, Kiwi Gardener would be pleased to pass it on. Opposite Clockwise from top Nicola with the prized ‘Tiptree’ potato; Framed memorabilia commemorates the 40th anniversary of the sailing of the Tiptree from Plymouth, England to New Zealand in 1864; Nicola’s parents Lorna and Ivan Lilley who cultivated the ‘Tiptree’ in Kaikōura; The ‘Tiptree’ potato is typically a smaller tuber with a purplish skin and white, waxy flesh. What is potato seed rejuvenation? A potato tuber typically exhibits two kinds of age: chronological and physiological. ‘Chronological’ refers to the literal age (in number of days) of a tuber, while ‘physiological’ refers more to ‘what’s going on inside the potato’ in terms of chemical changes. The more a tuber is stressed, the more its physiological ageing process is accelerated. Stressors can include temperature extremes, excesses of moisture or dryness, pest damage, and inadequate storage conditions. It is thought that adverse conditions post-harvest have more of an effect on physiological ageing than growing conditions. Physiological ageing affects many aspects of a potato’s growth including how soon buds develop on the tuber, how many sprouts grow from those buds, how the plant grows in the ground, and the size and number of potatoes on a shore. Once armed with this information, plant scientists (and, to an extent, the home gardener) can manipulate or ‘rejuvenate’ seed through altering various environmental factors. For example, if a tuber is physiologically young (in which case it produces fewer stems but larger tubers), temperature during storage can be increased to age the tuber. In this case, more stems will result, giving a greater number of smaller potatoes on a shore. Conversely, providing ideal storage conditions for a tuber, and planting it as soon as growing conditions allow, results in a decrease in the physiological age of a seed potato which will, in turn, generate fewer but larger potatoes on a shore. Sometimes, seed potatoes are treated with a special rejuvenating chemical to alter their physiological age. gardener.kiwi IT’S TIME FOR SEED POTATOES! POTATOES! Get Get the the very very best certified best certified seed potatoes potatoes from Newton’s. from Newton’s. All your favourite All your favourite varieties plus varieties a few plus exotics. a few Order exotics. online Order now, but online get quick now, but as they get will in quick sell out! as they will sell out! NOW EVEN BETTER WITH FREE FREIGHT! Terms Terms & & conditions apply. Free Free freight within the the Auckland city region area only. Minimum spend $35. kiwigardener 61 www.newtonseed.co.nz
The curious journey of celery It has been revered and feared and also turned into a rather interesting carbonated drink. There is more than meets the eye with celery. words Diana Noonan 62 kiwigardener gardener.kiwi