Giant Dioon is a prehistoric-looking cycad known as Dioon spinulosum, featuring stiff, blue-green fronds that form a striking, symmetrical rosette. It can grow up to 3m tall, making it a dramatic focal point in landscapes. Giant Dioon thrives in full sun to part shade and prefers well-drained soil, making it a low-maintenance choice for adding a touch of ancient beauty to gardens, especially in subtropical and tropical climates.