20 seeds. 75 days. Citrullus lanatus. Annual.
 
Watermelon 'Blacktail Mountain' has small, round fruits with red interior. It was bred in Idaho by Glenn Downs in the 1970s.
 
Sowing Watermelon Seeds: 
 
Sow seeds outdoors after the last frost date when the soil is warm, 1/2 inch deep. Sow in hills that are spaced 5 feet apart and thin to 3 plants per hill, or sow in rows 2 feet apart. Full sun.