After your Calla Lilies finish blooming you'll see a seed pod hanging just behind where the flower was. Let the seed pod remain on the plant until it turns yellow and becomes soft. Once you remove the pod, gently break it open and remove the seeds from the inner pulp. If you want to grow Calla Lilies from seed you have to be very patient. Calla Lilies usually take 3 or more years to produce flowers after the seeds are planted.