Growing watermelons vertically requires providing support because they won't naturally climb much on their own. You'll need to assist them by tying the vines to a trellis.
Here's how:
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Provide Support: Watermelon vines need assistance to climb.
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Tying the Vines: Use a loose figure-8 loop around the vine, just below a leaf joint, to attach it to the trellis. Surveyors tape is a good option for this.
