Certain localities appear to be easier to breed than others. The Mpumalanga/Limpopo Berg adders are the most regularly bred in captivity although this may be due to the fact that they are by far the most commonly kept. They tend to be smaller than the KZN Drakensberg and Cape Berg adders so babies are smaller (up to 125mm) and may require assist feeding with pinky parts or small lizards before switching to full pinks. Mating occurs in late autumn with females give birth in late Spring/Early summer. Litter size ranges from 5 – 12 babies. 

There are a handful of keepers working with the Cape Berg adders though they are infrequently bred. They mate in winter and babies are born in late summer and measure up to 135mm. 

Berg adders from the KZN Drakensberg tend to do well in captivity in the short term but many don’t thrive in the long term, as a result they are bred infrequently. The handful of captive breeding we are aware of indicated the adults mated in early Spring with females giving birth in late summer. Newborns measure approximately 165mm. These Berg Adders are fond of retreating to a grass tussock and in captivity will almost always choose this over a rock hide, so this should be provided for. Be careful not to keep these babies too warm or too dry.