How are your Japs doing?

I planted lots in a bit of the garden that does have white-rot so will need to watch them closely, probably from mid may depending on weather. They have been flooded in the last few weeks but seem to be surviving.
I've not measured them but they look to be 4 to 8 inches. There are few gaps. I did have some spare that were on the path in a box and have sprouted a few inches but not got round to putting them in the gaps.