You need to make a circuit board and some diamantine (diamond) electron tubes, and put said electron tubes onto your circuit board (one should be fine). you'll need to put the circuit board in the multifarm, and then plant the reeds yourself. make sure that you are providing your multifarm with fertilizer, water, and power, or the farm won't work . It doesn't need much power, but you'll need a little bit to harvest the reeds. you need a farm gearbox to input power, a farm valve to pump in water, and a hatch to move items in and out of your multifarm with pipes or tubes.