1、 Blade difference

Pineapple is hard leathery, rosette shaped, basal, banded and slightly curved outward. The leaf colors are different, some have dark green horizontal lines, some are brown and have green water flower patterns, and some green leaves have dark green spots. Especially near flowering, the leaves in the central part will turn dark red, pink, or the whole leaf will turn dark red or only the front part will turn red

The leaves of water tower flower have 6-15 pieces, which are in broad lanceolate shape. They stand upright at the initial stage and bend slightly outward at the later stage. There are small brown spines on the edge at least in the upper half, with green on the top and pink green on the back

2、 Color difference

The color of pineapple flowers is mostly sky blue or light purplish red

The bracts of the water tower flower are pink, the sepals are dark red, and the petals are red