Plant it to grow Crappy Sign. This is not the greatest sign, but it'll do in a pinch.
Crappy Sign Seed price in Growtopia: sells for about 75/WL (median of 7 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: SIMALA, IMUPMALL, LUMSI, 01ZKQ