Polygala sekhukhuniensis occurs within small areas of highly erodible, clay and mineral rich soils, to which it appears to be specifically adapted (Siebert et al. 2010). It has been recorded at many localities within the Sekhukhuneland region, but always in close association with this particular habitat, which is targeted for mining. At least 70% of known subpopulations were recorded in areas now densely populated or mining sites. Most subpopulations occur within Sekhukhune Plains Bushveld, which has been most severely affected by recent habitat destruction, with an 18% increase in transformation recorded between 1996 and 2009. In the southern part of its distribution range, some subpopulations have been recorded from Sekhukhune Mountain Bushveld, however, the rate of loss of montane vegetation is significantly lower, with a 10% increase in transformation since 1996. If current rates of habitat loss is to continue, transformation within montane areas is likely to reach 23% by 2026, and 41% on the plains. As this species is largely restricted to plains and lower slopes, it is therefore inferred that a population reduction is more likely to follow rates of habitat loss of Plains Bushveld, and that a reduction of between 30 and 40% is likely to be reached over a 30 year period (three generations).

Siebert, S.J., Retief, E., Van Wyk, A.E. and Struwig, M. 2010. A new species of Polygala (Polygalaceae) from ultramafic soils in Sekhukhuneland, South Africa, with notes on its ecology. South African Journal of Botany 76(2):345-353.