Sgt. Volkin is the author of The Ultimate Basic Training Guidebook. The Ultimate Basic Training Guidebook is available (as of this writing)) in both book and e-book format at www.ultimatebasictrainingguidebook.com.
Step 1. Plant watermelon seed during spring once all danger of frost has passed in a location that receives full sunlight. Spread 3 inches of organic manure over the planting site and use a garden tiller to incorporate it into the soil to increase drainage and fertility.
1 You can plant about ten seeds in each mound, in three groups of three to four seeds each. The groups are then spaced about a foot apart (30 cm).  In about a few weeks you can see which watermelon plants grow the strongest, and snip off the weaker ones, leaving only one seedling in each group.