Plant it to grow Steel Block. The sturdiest of blocks.
Steel Block Seed price in Growtopia: sells for about 1 WL, buyers pay about 1/WL (median of 84 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: AZY80, YXRLC, XELZR, ZANITU, DOFCJ