Potato

Meet the potato, the most surprising crop in a Dubai winter bed. You bury a lumpy, sprouting tuber in the cool of November, and weeks later a bushy green plant appears with white or purple flowers, hiding a harvest underground.

Its character is fuss-free but time-sensitive. It wants full sun, loose soil that drains, steady water and a mound of earth around the stems. It does not want heat, and it will turn its energy into leaves instead of tubers once the days warm.

What it brings is a small act of treasure hunting. Run a fork through the bed in February and lift potatoes still dusted with soil, which no shop-bought bag can match. Even a deep grow bag can hold a crop.

Potatoes are a winter crop in the Gulf, and the timing matters. The UAE Ministry of Climate Change and Environment's calendar lists potato for October to November and gives 100 to 120 days to harvest, which puts the digging in late January to March. A Dubai villa gardener profiled by Gulf News grows potatoes among his vegetables. Researchers at Sultan Qaboos University in Oman, working with planting dates between November and January, describe potato as a relatively new crop in the Arabian Gulf that faces unusual exposure to heat stress, and found that tuber number followed the minimum temperature and tuber weight followed the maximum.

Start with proper seed potatoes. UF/IFAS and NC State both say not to use supermarket potatoes, which are often treated to stop them sprouting. Cut large tubers so each piece has at least one eye (UF/IFAS) or two (NC State), and let the cut surface dry for a day or more. Plant in a trench about 6 inches (15 cm) deep in full sun, then mound soil around the stems as the plants grow; NC State says to hill when the plants are about a foot tall, and once or twice more. Tubers turn green and toxic if left uncovered. Raised beds give the drainage potatoes need, and NC State says grow bags should be at least 2 feet deep and hold at least 30 gallons.

Heat is the limit. A Washington State University study reports that higher soil and air temperatures at the start of tuberization encourage vine growth at the expense of tubers, and that heat during bulking promotes heat sprouts, misshapen tubers and likely more disease, so plant at the start of the Ministry's window and finish the crop before the weather warms. FAO rates potato as moderately sensitive to salt, with a yield threshold of about 1.7 dS/m, so use clean water and a sweet-soil bed.