When John Adams moved from Philadelphia to the White House, the building was still under construction and there was no sign of a garden.
Thomas Jefferson's gardens at Monticello combined the beautiful with the practical.
Heirloom plants and flowers have historical significance because of their seeds are handed down across successive generations of gardeners.
April is known as the cruelest month due to the erratic weather and the possibility for freezing temperatures to creep back in and injure new plants.