Vining vs. Bush Watermelon: Same Fruit, Very Different Footprint
This is a genuine plant-architecture difference, not a marketing distinction. University of Maryland Extension gives standard watermelon vine length as 6 feet (for shorter vining types) up to 20 feet for standard long-vine types -- over a threefold range within "standard" watermelon.
University of Georgia Cooperative Extension confirms real bush or "short internode" watermelon varieties exist, and is specific that they "produce fruit the same size as standard or long internode types in a smaller amount of space" -- not smaller fruit on a smaller plant, the same fruit on a compressed one. UGA's C1035 publication names ‘Bush Sugar Baby’ as a real commercial cultivar bred for exactly this.
One extension source that isn't about spacing at all but is genuinely watermelon-specific: seedless watermelon is triploid and self-infertile. Per University of Nebraska-Lincoln Extension, a seedless planting needs a regular seeded "pollenizer" variety planted nearby -- roughly one row of pollenizer for every two to three rows of seedless -- or it won't set fruit at all.
Why Spacing Matters for Watermelon
University of Arkansas Cooperative Extension notes watermelon has one of the deepest root systems of any garden vegetable, and warns that "planting too close results in excessive vegetative growth" -- crowded watermelon puts energy into vines and leaves rather than fruit.
For anyone gardening in a raised bed or small plot, the real decision isn't how to squeeze standard watermelon into less space -- it's whether to grow a genuine dwarf cultivar instead, since the plant's actual vine length is what's driving the spacing requirement, not an arbitrary rule.
