We have struggled with these plants for at least 6-8 months and just can not work out how to get them to back to health.
They started yellowing in Autumn last year and seemed to have plateaued, look sick and little growth ever since. We have tried pulling away our wood chip mulch from the stem of the plants, given extra water, applied fertiliser (osmecote, Seasol, Dynamic Lifter) with little effect. Any help would be appreciated.
The following links are what the plants are currently looking like: (First picture in this album are healthy Polygala's on the other side of our garden)http://s1343.photobucket.com/user/andrew_burns1/library/