They can be both depending on where they are growing and how they are treated. They are normally endemic to sub-tropical and tropical regions where they are grown as perennial plants.
However, if they were grown in a cold climate with frost/ snow they could only be treated as annuals unless they were protected.
They can be either depending on the species or variety.
An Amaryllis, the flower we commonly see in November and December, will continue to come back every year over several years if it is cared for. It's a perennial, as are most of its family members (family Amaryllidaceae). Note that almost all of these popular flowers, though they are of the family Amaryllidaceae, are actually of the genus Hippeastrum (which numbers some 80 species). The (only) flower of the family Amaryllidaceae that is of the genus Amaryllis is Amaryllis belladonna, which is similar to Hippeastrum. Links are provided for the curious.
annual
Neem is a perennial.
No, it is a perennial
Amaranth is both an annual and a perennial plant. It is typically grown as an annual for its edible leaves and seeds, but some varieties can survive multiple years in temperate climates if conditions are favorable.
Arqyranthemum is typically grown as an annual plant in most regions, but in warmer climates, it can be grown as a perennial.
Perennial :)
perennial
Perennial
it is perennial
Basil is an annual, not a perennial.
perennial
perennial
Perennial
annual
Annual
annual
Annual.