The map below shows the geographical patterns of Chill Units in South Africa. In agriculture, many types of fruit require a chilling period after buds are formed (summer). A too short period - or too few chill units - results in delayed and substandard foliation, flowering and fruiting.



SOURCE: Schulze RE 2007. South African atlas of climatology and agrohydrology. WRC Report No. 1489/1/06.