We leave our bulbs in the ground year-round. We've found that you can plant year-round, also. Most people plant bulbs in the fall simply because that's when they are available commercially. Any deeper, and bulbs risk rotting in our damp, clay soil. But bulbs are planted a little bit deeper in cold climates.
Daffodils are fragrant, early-flowering, spring bulbs.
The term heirloom refers loosely to daffodils existing before 1940. Easy-care favorites, heirloom daffodils grow in full sun to part shade. They prefer well-drained soil, but are very light feeders. These plants are most commonly propagated by bulb division, but some self-sow freely.