Hi,

Wikpedia says

"Some species, such as the Uruguayan Hippeastrum petiolatum, are
sterile and unable to produce seeds. H. petiolatum is a sterile
triploid that reproduces asexually, producing many bulbils around the
mother bulb. These are light, and easily carried on the surface of
water ensuring distribution of the species during the rainy season.
Other species such as Hippeastrum reticulatum are self-pollinating,
reproducing by distributing seed. Although this does not guarantee
genetic diversity in natural populations, it is widely used by
colonising species. These two examples are not however typical of the
genus, which commonly reproduces through allogamy. One mechanism that
limits self-pollination is that of self-incompatibility by which seeds
are only produced by pollination from other plants.[67][68]
Furthermore, the plant generally releases its pollen about two days
before its stigma is receptive, making cross-pollination more
likely.[67] Pollinators include Humming birds in subtropical areas,
and moths.[30]"