Plant it to grow Waterfall. Falling water is one of the strangest natural phenomena in Growtopia. You can't jump up through it, since you're not a salmon. You can, however, drop down, since you're like everything else!
Waterfall Seed price in Growtopia: sells for about 5 WL (median of 3 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: 3DNV