Pancratium maritimum, or sea daffodil seeds and pods, species of bulbous plant native to both sides of the Mediterranean region and Black Sea from Por Stock Photo - Alamy
Breeding Daffodils - White Flower Farm's blog
Do Daffodils Spread? (Controlling and Encouraging It) - The Practical Planter
How to Divide and Transplant Daffodil Bulbs | Gardener's Path