This listing is for Campsis Radicans Trumpet Vine Seeds How to Plant Trumpet Vine Seeds Use good garden soil amended with organic material or a purchased potting soil when planting seeds. Sow seed on the surface of the soil and lightly sprinkle more soil over them. Choose a well-draining container to prevent damping off and root rot as seeds germinate and sprout. As with any seeds, provide moderate water and place the flat or container in a warm area for quicker germination. To enhance germination, you can also cover the container with plastic wrap. Remove it once per day for an hour to allow excess moisture to evaporate. Fall planted seeds outdoors usually receive enough natural moisture unless your region is especially dry and should not be covered. Keep any weed pests away from seedlings as they grow. Transplant indoor plants in spring when soil temperatures have warmed to 60 degrees Fahrenheit (15 C.) or more