Plum is a deciduous stone fruit in the Rosaceae family. It is an important temperate fruit grown for fresh consumption, processing, and drying into prunes. In Kenya, farmers grow plums mainly in the central highlands and other cool regions such as Nyeri, Murang’a, Kiambu, and parts of the Rift Valley. The fruit appears in red, yellow, and green varieties, although red types dominate local markets. In addition, plums provide income through fresh sales and value addition into jam, juice, wine, and dried products.
Varieties
Farmers grow several plum varieties in Kenya, including Methley, Santa Rosa, Beauty, Shiro, Kelsey, Cherry plum, and Harry. Japanese plums (Prunus salicina) dominate fresh markets because they produce juicy, sweet fruits. In contrast, European plums (Prunus domestica) are better suited for processing and drying. Growers also use rootstocks such as cherry plum (Prunus cerasifera) to control tree size and support high-density planting. Therefore, farmers select varieties based on market demand, fruit quality, and adaptability.
Climate & Soil
Plums grow best in cool, subtropical to temperate climates at altitudes around 1,800 m above sea level. Optimal temperatures range from 15–24°C. Additionally, the crop requires annual rainfall of 1,000–1,200 mm and full sunlight for 6–8 hours daily. Plums perform well in deep, well-drained loamy, sandy loam, or clay loam soils with pH 4.5–6.5. However, waterlogging reduces growth and yield, so farmers should ensure proper drainage.
Propagation & Planting
Farmers propagate plums mainly through grafting to ensure uniform growth and early fruiting within 4–6 years. They usually plant at the onset of rains or under irrigation. Most growers use a square planting system. Spacing ranges from 5.4 × 5.4 m in sandy soils to 7.2 × 7.2 m in fertile soils. Before planting, farmers prepare pits measuring 1 × 1 × 1 m and mix topsoil with 10–30 kg of farmyard manure and basal fertilizer. Importantly, they keep the graft union 15–20 cm above ground to prevent collar rot.
Field Management & Harvesting
Farmers manage plum orchards through irrigation, fertilization, pruning, and pest control. For example, they irrigate regularly during fruit development, especially between May and June. In addition, they apply farmyard manure annually and split nitrogen applications before and after flowering. Training systems such as the open centre and modified central leader help trees develop strong structures. Farmers also prune regularly to remove dead or diseased branches and improve airflow.
Furthermore, they improve pollination by interplanting compatible varieties, especially for self-unfruitful cultivars. They also thin fruits to reduce overbearing and improve size. Common pests include aphids, fruit moths, and San Jose scale, while diseases such as brown rot and bacterial canker require proper management.
Farmers harvest plums in two pickings because fruits mature unevenly. They use colour change, firmness, and total soluble solids (TSS) of 12–16% to determine maturity. After harvesting, they handle fruits carefully, pre-cool them at 0°C, and store them at low temperatures to extend shelf life.
Nutritional Value
Plums provide vitamins A, C, and K, as well as dietary fibre, antioxidants, and potassium. As a result, they support digestion, heart health, and overall immunity. The edible portion is the fleshy mesocarp.
Uses & Market Potential
Farmers and traders sell plums fresh or process them into juice, jam, wine, and dried prunes. Moreover, urban markets show strong demand for high-quality fruits. Value addition and cold storage further increase profitability. Therefore, plum farming offers a viable income opportunity in Kenya’s highland regions.