Daffodils, often called the trumpet flower, grow from a bulb that blooms in spring. They have a cupped trumpet centre with six petals around it in yellow, pink, white, peach and some bicolour varieties.
Daffodil bulbs reproduce and multiply underground and tend to get crowded after a few years. An indication this is happening is that the bulb produces plenty of green foliage but few to no flowers.
The best time to divide daffodils is after they have bloomed and the foliage starts to turn yellow in late spring or early summer.
One method is to pull bulbs by hand to avoid damaging them. Another method is to dig around the edge of a clump of daffodils and carefully pry the bulbs up.
The bulbs can be pulled gently apart. Damaged bulbs or those that feel soft instead of healthy and firm should be thrown away.
Replant separated bulbs right away at the same depth they were in the soil before being separated. The yellow leaves should remain attached until they dry and fall off. This will enable the bulb to store energy enabling it to bloom next spring.