To plant lotus seeds, you'll want to start by preparing the seeds themselves, which involves filing or scratching the seed coat to help it absorb water. Then, soak the seeds in warm water for a few days until they sprout, after which you can transfer them to a container filled with a mix of soil and sand in about 2-3 inches of water. It's best to use a large, shallow container as lotus plants can grow quite big, and make sure the water is warm and has plenty of sunlight. As they grow, you can gradually increase the depth of the water, but be sure to keep the soil moist and fertilize them regularly for optimal growth.