It's harvest time for Melania Trump.The first lady, more at home in Manhattan than among rows of crops, is set to host local schoolchildren at the White House on Friday to harvest and replant the vegetable garden Michelle Obama planted in the South Lawn — carrying on a symbolic piece of the Obamas' food policy legacy.Many in food circles had been concerned that Melania Trump and her fast-food-loving husband would not carry on Michelle Obama's expansive kitchen garden, an internationally recognized symbol of local food and the Obama administration's push to promote healthy eating.