After the silicone on the funnel has set up and the bottom cap is primered and cemented onto the bottom end of the PVC drain pipe, feed your starter plant through the funnel and gently pull its leaves through. In this picture, you can see the root ball of a tomato plant in an organic plant starter plug. No need to loosen or fray out the roots, they'll find their way to the water up through the planter all on their own.