You might try an acid based fertilizer to lower the ph. Most of South Africa is acidic rather than alkaline, and the paler foliage may indicate it is struggling.

Thank you, bahia. I will follow your suggestion.

Strangely, as mentioned in my first post, we have a large Polygala Myrtifolia Grandiflora in our back garden which has much greener leaves. It seems to be different from the newer plant, but it is growing in different soil which may be less alkaline.

This older plant spawned a new plant, which was growing adjacant to it, and we've just had to transplant this. It's not faring well, and still looks very droopy after a week. Do you have any suggestions as to how to improve its chances of survival, please?

hope you were careful innyanga, septemberbossies like alkaline soils. at my grandmothers they grew on pure lime sandy soils and here on the farm they grow on clay limes! it might just be the plant...even here in south africa i have seen about 20 different versions in the wild of the plant. or you might've also just bought a weakling...a dud...but be careful with increasing your pH too much, it will probably stand it, but just hoped you were careful!