Vincent Wei led fellow Singaporean farmers around an empty Malaysian plot, laying out plans for a greenhouse and rows of leafy vegetables. What he pitched was not just space for crops but a lifeline for growers struggling to make ends meet in a city state with high prices and little vacant land. The to-be agriculture hub is part of a joint special economic zone launched last year by the two neighbours, expected to cost US$123 million and produce 10,000 tonnes of fresh produce annually. It is...