Daffodils usually spread by producing new bulbs (bulbets) underground, which themselves grow into full plants and repeat the process. Daffodils are also capable of producing seeds after flowering, and these seeds may be spread by the wind. However, daffodil seeds take quite a while (5 years or more) to grow into full plants. If yours have somehow made it to undesirable places, feel free to dig them up and put them back in their own territory. Giving them a stern talking to may also help quell their wanderlust.
Daffodils usually spread by producing new bulbs (bulbets) underground, which themselves grow into full plants and repeat the process. Daffodils are also capable of producing seeds after flowering, and these seeds may be spread by the wind. However, daffodil seeds take quite a while (5 years or more) to grow into full plants. If yours have somehow made it to undesirable places, feel free to dig them up and put them back in their own territory. Giving them a stern talking to may also help quell their wanderlust.