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Asara is very close to the False Bay coast and geology on the estate is typical of the southern Cape coastal region, with soils that are millions of years old, sandstone mountains, granite intrusions and patches of shale.
Two soil types are predominant on the estate - Oakleaf and Tukulu. These soils are closely related, both are derived from ancient granites that have decomposed, and are characteristically well-drained and fertile with high clay content and good water retention. Vines on these soils tend to perform consistently over the seasons, and the soils provide a solid foundation for production of high quality grapes of the noble varieties.
There are also small patches of Glen Rosa and Vilafontes, gravelly and quick drying soils that are derived from shale. These soils have less inherent fertility than the Oakleaf and Tukulu and tend to produce smaller vines, lower yields and highly concentrated fruit. Grape varieties planted on these soils include Petit Verdot, Pinotage and Cabernet Sauvignon.
Farm management makes use of water stress strategies to induce the vines to produce grapes with concentrated flavor. Soil moisture levels are tracked with the use of computer monitored probes, and irrigation is supplied as deemed optimal.
Duplex Soil – Mainly Escourt soil form (decomposed granite). These make up very large portion of the soils in the Western Cape coastal region. They have a relatively sandy top-soil and an underlying clay pan.
Structureless Soil – Clovelly (well drained, redish yellow in colour). These soils indicate that there are no restrictive layers in the sub-soil, which would impede growth.
Tukulu Soil – Very uniformed type of soil (Granite).
Hutton Soil – These are well-drained soils of red and yellow colour respectively. They generally require little preparation and tend to have a high clay content with compact in the sub-soil.
Clovelly Soil – These are well-drained soils of red and yellow colour respectively. They generally require little preparation and tend to have a high clay content with compact in the sub-soil.