The farm falls within an area covered with pre-weathered biotite granite part of the Cape Granite Suite formed some 600 million years ago. The Schapenberg hills in the Helderberg basing ridging off and out of the Hottentots Holland Mountins, formed at the same time, is partly covered by remnants of layers of the Malmesbury Group which is 900 million years old and largely forms shales, siltstones and fine grained greywackes.
According to Van Niekerk (1999) the top 40-60 cm of the soil profile is composed of transported material with a relatively high percentage of quartz and other ferruginised stones as well as some sandstone although granite is the sole parent material.
The soils are yellowish, coarse sands where most of the upper (eastern) estate and the south facing slopes belong to the Oakleaf and Clovelly soil form, making up the biggest part of Wedderwill. The centre part of the farm mainly around our stables consists of Glenrosa whereas the big dam area is mostly comprised of Escourt and Pinedene. Most of the western end of the estate is made up of Villafontes and Cartref and the area bordering Vergelegen has some Avalon.
The topsoil of about 1 – 3 meters in depth overlay saprolitic materials. These soils are slightly acidic with a pH of 4,5 – 5,3, an organic matter content of about 30 – 40% and a clay content of about 20 – 35%. The soils generally have a high potential and few limitations to plant growth.