Hi Ruth, Growing in water makes it sound like these are wetland plants, which are plants that have various adaptations to let them grow in water-logged or wet conditions. I can see that these are actually terrestrial species (though i can't see well enough to ID ) which don't have such adaptations. Terrestrial plants can become surrounded by water or covered in water after a bit of rain, in which case they look like they are 'growing' in the water but are really just hanging in. Just how long a terrestrial plant can survive in a flooded or waterlogged situation varies with species, with season.