Capable of producing viable ovum, pollen, or both. A plant which can contribute genetic material for the creation of viable seeds.
Fertility does not affect a daylily’s garden value, but it does become a serious consideration when a grower intends to hybridize with a specific cultivar. Some cultivars have fertile pollen but will not set seed, others may set seed, but the pollen may not set pods on other cultivars. Many garden catalogs will mention whether a plant is pollen or pod fertile. See: fertile both ways.