large-cupped daffodil

Large-cupped daffodils require moderate watering, especially during their flowering period in the early spring. Water your plants in the morning once a week or as needed. Make sure the soil is always moist, but not soggy. If it appears too dry, add a bit more water until it becomes saturated. Make sure the soil is light and well-draining so that it does not become waterlogged and cause root rot. During the summer months, water less as the plant enters dormancy.

Large-cupped daffodil (Narcissus 'Slim Whitman') grows best in sunny spots with at least 6-8 hours of direct sun each day. Morning sun is particularly beneficial, as afternoon sun can sometimes cause the plants to become too hot. To ensure healthy blooms, provide shade for the plants during the hottest part of the day, such as noon to 4 p.m. When temperatures begin to dip in the late afternoon and evening, let the sun return. This will help the plants retain heat that is dissipated during the day.

Large-cupped daffodils, such as Narcissus 'Slim Whitman', typically need to be pruned after flowering is complete. This is usually done in early spring, by deadheading the faded flower heads. It is important to also trim the foliage at this time, cutting it back by about a half. Doing this encourages lush foliage and promotes the bulb’s energy for re-blooming the following spring.