I planted Vincas in early December and they have been doing well until a couple of weeks ago . One at a time they seem to be slowly dying. Some look very healthy and others have shrivelled and died. It looks as if I will lose the lot eventually.
I have been watering them daily because of the heat.
The soil isn't fabulous. Moderately heavy clay but in a raised bed so it does drain a bit. I applied Seasol when I put them in. I'm going to re- landscape in a couple of months and plan to improve the soil but worry that there may be something in there that will kill everything else I plant.
I previously had things (bulbs) growing in this area and they were okay.
Can anyone suggest what the problem could be?