I noticed a few of my winter pansies were floundering while the rest
were going great guns. On lifting the plants I found they hadn't
extended their root system beyond the original pot size and the centre
of the root ball felt solid and unyielding. Is this what they call being
root bound? Is there anything you can do before transplanting them? I
imagine soaking them would just wash the soil off and leave you with a
bunch of intertwined roots. Anyone got any tips?