Agave filifera (thread agave) is a species of flowering plant in the family Asparagaceae, native to Central Mexico from Querétaro to Mexico State. Rosettes of spiny leaves with long white fibres produce dramatic 2.5-metre (8.2 ft) spikes of yellow flowers in autumn and winter. This evergreen succulent perennial requires heated indoor culture during winter in temperate regions, though it may be placed outside during summer months. It has gained the Royal Horticultural Society's Award of Garden Merit.