Today the portabella kit I started growing three weeks ago reached maturity, according to the instructions. Indeed, upon returning from four days at the Fox Hill, we were amazed to find the four little bulbs we left Thursday had sprung up like balloons in spite of a weekend of neglect. With long thick stems and broad tops, the portabellas are certainly clamoring for the thrown of their box, blocking out any little guys below them. Harvesting time has come.