We recommend adding plants as soon as you have started the aquaponic cycling process. Getting your plants in early gives them time to put down new roots and establish themselves before the fish are introduced and nitrates need to be absorbed. We highly recommend adding MaxiCrop soluble seaweed powder to your uninhabited fish tank when you plant, this will give the new plants a boost of micronutrients and encourage them to put down healthy new roots. Our Cycling Kits include powdered MaxiCrop and everything else you need to get your aquaponic system cycled quickly.