Posted: 25/01/2015 at 13:40
Hi Frank, for knowledgeable customers, anything they won't find in the nearest GC.
If you're a seed grower look at Chiltern seeds, Plant World Seeds and Special Plants (Derry Watkins), There are others and someone else may provide the names but these are the ones I've tried and found successful.
Otherwise, for charity plant sales generally, anything that's in flower at time of sale. or bedding plants