If you adore basil but can never seem to grow enough of it, then try growing Lettuce Leaf basil. What is Lettuce Leaf basil? The basil variety, ‘Lettuce Leaf’ originated in Japan and is notable, as the name suggests, for its enormous leaf size, giving the basil devotee more than ample amounts of the sweet herb. While this basil with big leaves doesn’t taste exactly like the Genovese varieties, it still has a sweet, basil flavor.