Answer: A sling can be made of any stretchy fast drying fabric. Old nylon stockings are great for this. Make a supporting sling when the melon or whatever is about softball sized or seems to be straining the vine. Allow ample room for the melon to grow and stretch the fabric, loosen the sling periodically as needed. This is not usually used for full sized watermelons, but more for smaller types that can be grown well on a trellis.
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