Answer: Water hyacinths need plenty of nutrients, warm temperatures, and plenty of light to increase. You could try adding a bit of water soluble fertilizer to the water or possibly plant the roots into pots of a heavy rich garden soil to provide the needed nutrients. (Adjust the water level to keep the crowns at the surface.) Keep the water temperature warm -- you might do better with a small aquarium heater rather than the aerator since they do not mind stagnant water at all. Finally, although it seems like it might be a good idea to light them around the clock, it isn't. Allow them a dark period of about eight hours every night during which they can complete their normal cycles. Good luck with your project!
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