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Watering
Because her roots are in water you just need to keep that water topped up. Make sure the tops of the roots aren’t under the water and change the water every few weeks to keep it clean.
Medium light
She’ll need a good amount of light to bloom, but keep her away from direct sun.
Feeding
In spring and summer, add a drop of liquid fertiliser to the water. After a day or so, change the water to keep it clean.