"In the circle formed by the tusks - symbolise fertility, growth and the development of potential, the nourishment of people and the agricultural aspects of the earth."
www.gov.za/symbols/coatofarms.htm
Ears of Wheat
In the new Coat of Arms, wheat symbolises the agriculture of South Africa.
Although maize is the
primary grain crop of South Africa, it is closely followed by wheat cultivation
and sugar cane. Wheat
is produced in the Western Cape and the eastern parts of the Free
State. These are winter rainfall areas. At present, the Free State
produces the highest amount of wheat but generally the Western Cape is more
stable because of it’s more dependable rainfall.
Wheat
is a carbohydrate, an important part of the daily diet and the public is made
aware of its nutritional value through demonstrations in the media and
educational and health institutions.
The
largest farming area in South Africa is under maize, followed by wheat and, on a lesser
scale, sunflowers and sugarcane. About 15,000 
s produce maize, mainly in
the Free State, North West province, the highveld of Mpumalanga and the KwaZulu
midlands. About 6,5 metric tons is
consum
South
Africa is the world’s tenth largest producer of both sunflower seed and sugar.
Sunflowers are grown in North West province, Mpumalanga highveld and the Free
State. Sugar flourishes in the sub-tropical coastal areas of KwaZulu Natal, and
under irrigation in the southern parts of Mpumalanga.
The wine and spirit industry in South Africa is a very important part of the agricultural sector. South Africa is ranked seventh in the world with an average annual harvest of around 900 million litres. South African wine is sought after all over the world and has a definite place in the international market.
Further reading on South African agriculture at http://www.agric.za/