The tomato is now grown worldwide for its edible fruits, with thousands of cultivars having been selected with varying fruit types, and for optimum growth in differing growing conditions. Cultivated tomatoes vary in size from cherry tomatoes, about the same 1–2 cm size as the wild tomato, up to beefsteak tomatoes 10 cm or more in diameter. The most widely grown commercial tomatoes tend to be in the 5–6 cm diameter range. Most cultivars produce red fruit; but a number of cultivars with yellow, orange, pink, purple, green, or white fruit are also available. Multicolored and striped fruit can also be quite striking. Tomatoes grown for canning are often elongated, 7–9 cm long and 4–5 cm diameter; they are known as plum tomatoes. Tomato cultivars are roughly divided into several categories, based mostly on shape and size. "Slicing" or "globe" tomatoes are the usual tomatoes of commerce; beefsteak tomatoes are large tomatoes often used for sandwiches and similar applications; plum tomatoes, or paste tomatoes, are bred with a higher solid content for use in tomato sauce and paste; and cherry tomatoes are small, often sweet tomatoes generally eaten whole in salads. Tomatoes are also commonly classified as determinate or indeterminate. Determinate, or bush, types bear a full crop all at once and top off at a specific height; they are often good choices for container growing. Indeterminate cultivars develop into vines that never top off and continue producing until killed by frost. As an intermediate ground, there are plants sometimes known as "vigorous determinate" or "semi-determinate"; these top off like determinates but produce a second crop after the initial crop. Many, if not all, tomatoes described as heirlooms are indeterminate. Varieties available are Homestead, Roma and Rutgers. Tomatoe seeds are sold by the scoop. 1/4 tsp for $1.49; 1/2 tsp for $1.99 and 1 tsp for $2.49