Mature plants are routinely placed in the garden to give it the appearance of being successful, but if that's the case, the children won't be picking actual White House garden plants
They'll rush over to Food Lion or Wegman's or whatever grocery is nearby, buy up a pile of nice-looking vegetables and scatter them around the squirrel-infested WH garden.
The skeptic is never for real. There he stands, cocktail in hand, left arm draped languorously on one end of the mantelpiece, telling you that he can't be sure of anything, not even of his own existence. I'll give you my secret method of demolishing universal skepticism in four words. Whisper to him: "Your fly is open." If he thinks knowledge is so all-fired impossible, why does he always look? — James Sire (from, The Universe Next Door)