50 American Sycamore Tree Seeds Plant 1/8 inch deep. Keep the seeds 6 to 8 inches apart. Cover the sycamore seeds with a light mulch of leaf mold & peat moss. Water the sycamore seeds regularly, prevent soil from drying out. Keep the seed out of direct light for 30 days. Plant after they reach about 5 inches tall. American Sycamore Tree Seeds
