Instructions
Dig up the seeds you need to plant. The seeds are in the ground near the area where you find the Springy Step Shoes. To get there, use the flower-shaped cannon near Cloud Cuckooland's entrance. Use Kazooie's Bill Drill in the dirt on this floating island to find the seeds. Drill the small areas with the different textures to find the seeds.
Fly to the two areas where you can plant the seeds -- one is by the red Mumbo skull, and the other is by the blue Mumbo skull. Both are on floating islands that you can reach by using the Flight Pads adjacent to each skull.
Interact with the seed holes in the ground on the floating islands to plant the seeds. While on each island, explore the patches of dirt to find the holes. When the seeds are planted, the vines grow automatically.