In actuality, many of those greenhouses were sabotaged or disassembled completely by the departing Israelis. The about 50% or so of the remaining greenhouses were used for at least a couple of years by Palestinian to grow crops, but Israel did not allow those crops to be exported. They had no choice but to leave them by the wayside and let them rot. Since the greenhouses were not actually benefiting the Palestinians, they were eventually disassembled in order to make use the of raw materials.