[Lawrence]

I bought a couple of packs of these from Wilkinsons, and I planted them the same day.
I have watched the leaves wilt and die, and now all I have is a bump where there once was a plant.
Is there any chance of regrowth or have I just wasted my money AGAIN?
The regular red varieties treated the same way are doing fine, so I know it wasn't me.

[Kleftiwallah]

I would suggest you dig up the bump and take it back.  Too many folks are all too easily blaming themselves for 'faulty goods' when it comes to plants.      Cheers,     Tony.