Like its parents, Scilla × allenii grows from bulbs and flowers freely in early spring. The flowers are various shades of blue from lilac to violet and are intermediate in size between those of the parents, up to 2.5 cm in diameter when fully open. As with most hybrids, individual plants vary; some have been given cultivar names. 'Frà Angelico', with pale blue flowers, has gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017).
