Farmer Phub Zam, 55, is in a hurry. Monsoon rains have hit her farm in Bhutan’s Paro valley and Zam is rushing to harvest her broccoli before crop is damaged. “Of all my vegetables, broccoli is the most sought after,” she said. “Each kilogram sells for 90 rupees ($1.40).” That’s 15 to 30 cents more than broccoli imported from neighbouring India. Zam gets the higher price because her produce is grown without the use of…