It will grow without the gas only slower.
Growth in my high light gassed tank creates a 'blyxa huge sale' about every three months. Once the crown gets large it starts pulling away from the substrate.
The soil based, non gas, medium light systems it behaves for almost 9 months before I split and replant.
This is the gassed 75g due for a trim / replant (Flourite base)
You can see the shadow under the section on the right side because it's pulled up almost an inch off the sub. Blyxa seems to have a weak root system even with a rich sub the roots snap easily.