Are sold per 4.
Price is for 4 pieces.
The aquatic plants or hydrophytes are plants adapted to a temporary or continuous existence wholly or largely under water (submers or emers). They have morphological adaptations that allow them to survive. While the 'true' aquatic plants do not root in the soil and can often live underwater (with the exception of the inflorescences), the helophytes or marsh plants root in the soil and usually rise above the surface of the water. Source: Wikipedia