25+FRESH SEEDS . Great plant for landscapes or as Bonsai Planting directions Soak the seeds in a bowl of water for 4 hours. Choose a sunny, well-drained location in your garden. Loosen the soil with a spade and mix potting soil with the garden soil until you have approximately a 50/50 mixture. Break up any dirt clods. Plant the cardboard palm seeds 1/4 inch deep and cover with soil. Pat the soil down lightly. Plant seeds approximately 8 feet apart, as cardboard palms can eventually reach 6 feet in diameter.Water the seeds and keep the ground slightly damp but not soggy for several months.