Your welcome, I'm happy to hear you found more is growing! Hopefully you can harvest some from this patch in spring a few more years to come. In the wild they usually last 2-4years in the same spot (atleast the kinds I have here).
Btw, don't water if its reasonably damp already. Too much water can be a negative thing it also depends on how well the soil drains you don't want it to stand in water. But the cardboard is helping I'm sure, but maybe you should break it in pieces so that the fruits can penetrate threw the protecting layer?
Just throwing some ideas, what a wonderful thing to find growing wild in the backyard btw!
