I don't think too many Aquatic plants bloom in their submerged state (could wrong here..) most will when they are grown emersed. I think Anubias will sometimes flower under water through. Posted via Mobile Device
I've had elodea bloom as well, vals and sags also flower. but all these flowers are more cute than stunning. lol~
pennywort flowers are small but interesting, if grown floating you should see flowers in no time I've also had lindernia poking above the surface giving me small white flowers with purple highlights. many rotala species will give small yellow flowers if allowed to reach the surface.
I think banana lily flowers are also yellow~ or was that another lily? lol
I've had various Echinodorus flower, along with floating Frogbit, and those other plants mentioned like Anubias, Aponogeton.
Except for the ferns and mosses, all of our aquarium plants do flower, in their natural state, but as someone mentioned they may rarely do so in the aquarium. Some require emersed cultivation, others need brighter light (which means CO2 diffusion and higher nutrient supplementation).
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