If i'm not mistaken here, alluvial soil comes from river sediment and isn't meant to be potted directly into. I believe it's often used as an amendment added to potting soil as a nutrient source.

I would get it in some plain dirt or something, I have a feeling that alluvial soil is going to burn it to a crisp rather quickly. I think the danger of transplant will be less than the danger of leaving it in that "soil".

There's a good chance that the roots haven't grown much into the AS since it's hot with nutes, so I believe a transplant will be welcomed by the plant.

If someone else has an idea about this, please chime in. I want to be wrong here.