Mastering the Tree of Oil: The Complete Olive Farming Guide

Olive trees (Olea europaea) are among the most resilient evergreen crops in the world. Known for their fruits, which produce olive oil, table olives, and even pickles or spreads, they’re steadily gaining ground in Kenya as a high-value crop.

The reason is simple, demand. More Kenyans are becoming health-conscious, and global markets continue to prize olive oil for its health benefits—rich in monounsaturated fats, vitamin E, and antioxidants. At local markets in Nairobi and Mombasa, fresh olives sell for between KSh 100–200 per kilo, while processed olive oil can fetch KSh 2,000–5,000 per liter.

Premium table olives are also a profitable product, selling for KSh 500–1,000 per kilo.

What makes olives especially attractive to Kenyan farmers is their drought tolerance and ability to produce for decades once established. For smallholders, agribusiness owners, and farming enthusiasts, olive cultivation is both a sustainable and profitable opportunity.

Agro-Ecological Requirements

Olives thrive best in environments similar to the Mediterranean, but many parts of Kenya already fit the bill.

• Climate: Olives prefer temperatures between 15°C and 30°C, and while they can withstand heat up to 40°C, they don’t do well in frost below 5°C.
• Rainfall: Annual rainfall of 400–800 mm is sufficient, though irrigation is a must in drier regions. Good drainage is important to avoid root rot.
• Altitude: They grow well at 800–2,000 meters above sea level, with the sweet spot for fruiting between 1,000 and 1,500 meters.
• Best regions in Kenya:

• • Rift Valley counties like Nakuru, Laikipia, and Kajiado

  • Eastern counties such as Machakos and Kitui (benefiting from drought tolerance)

  • Central counties like Nyeri and Murang’a (with irrigation support)

  • Coastal areas like Kilifi (if drainage is well managed)

  • Meru (an emerging production zone with good market access)

Thanks to this adaptability, both semi-arid and highland areas of Kenya can successfully host olive orchards.

Soil Preferences and Preparation

For healthy growth and good yields, olives need well-prepared soils:

• Type: Loamy, sandy-loam, or rocky soils that drain well.
• pH: Slightly acidic to neutral (6.0–7.5).
• Preparation steps:

1. 1. Clear weeds, stones, and debris.

   2. Till soil to about 40–60 cm depth to support deep rooting.

   3. Dig planting pits (60 cm × 60 cm × 60 cm) at least a month before planting.

   4. Mix topsoil with 10–15 kg of compost or well-rotted manure per pit.

   5. Add 200 g of single superphosphate for root development.

   6. Test soil pH and add lime if the soil is too acidic.

Certified seedlings can be sourced from trusted nurseries like Seedfarm (+254712075915) or Organicfarm.

With a spacing of 5–6 meters, farmers can plant 120–150 trees per acre. The best planting seasons are during the long and short rains (March–May and October–December).

In drier regions like Kitui, pre-irrigation or water-retaining trenches help young trees establish.

Best-Performing Varieties in Kenya

Different olive varieties are suited for different uses. Some of the top performers locally include:

• Frantoio: Popular in Nakuru, produces high-quality oil with 18–20% oil content. Yields 2–4 tonnes per acre.
• Leccino: Early maturing and drought tolerant, suitable for both oil and table olives. Yields 2–3 tonnes per acre. Favored in Machakos.
• Kalamata: Known worldwide for its large, flavorful fruits. Ideal for premium table olive markets, especially in Nyeri. Yields 1.5–3 tonnes per acre.
• Manzanilla: A versatile variety for table olives, adaptable to semi-arid regions like Laikipia. Yields 2–3 tonnes per acre.

Crop Management Practices

Irrigation

• Young trees (first 3–5 years) need watering every 7–10 days in dry periods.
• Drip irrigation systems cost around KSh 50,000–150,000 per acre and are highly efficient in areas like Kajiado.
• Smallholders can rely on bucket irrigation, ensuring the soil doesn’t become waterlogged.

Mulching

• Apply 10–15 cm of mulch (straw, grass, or crop residues) to conserve soil moisture and control weeds.
• Cost: KSh 1,000–3,000 per acre.

Weeding

• Manual weeding is important during the first 3–5 years until the canopy shades out most weeds.
• Cost: KSh 5,000–10,000 per acre per season in labor.

Fertilization

• Organic: 10–15 kg of compost or manure per tree annually (KSh 2,000–5,000 per acre).
• Inorganic: 200 g of NPK fertilizer at planting, plus 100 g of urea per tree for top-dressing (KSh 10,000–20,000 per acre).

Pruning

• Prune annually during the dormant season to shape trees (open-center system) and remove diseased or dead branches.
• Benefits: Better airflow, easier harvesting, and improved fruit quality.

Pests and Diseases

Common Pests

• Olive fruit fly and scale insects (frequent in Rift Valley areas).
• Control: Neem oil sprays (1 tsp per liter every 7–10 days), insecticidal soaps (KSh 500–1,000 per liter), and pheromone traps. Natural predators like ladybirds also help.

Common Diseases

• Verticillium wilt and anthracnose, particularly in humid highland areas like Nyeri.
• Control: Copper-based fungicides (KSh 1,500–3,000 per acre), proper drainage, and removal of infected plant material.

Adopting integrated pest management (resistant varieties, cultural practices, and minimal chemicals) is the most sustainable approach.

Harvesting and Post-Harvest Handling

• When to harvest:

  • Green olives (September–November) – ideal for table olives.

  • Black olives (December–February) – ideal for oil production.

• Harvesting method:

  • Hand-pick fruits to avoid bruising.

  • Spread nets under trees to catch fruits during harvest.

• Post-harvest handling:

  • Sort and grade immediately, discarding damaged fruits.

  • Process green olives (brining/curing) within 24 hours.

  • Press black olives into oil using small-scale presses (KSh 100,000–300,000).

  • Store oil in airtight, dark containers at 15–20°C for up to 18 months.

  • Package table olives in 200g–500g jars, costing KSh 2,000–5,000 in materials.

• Value addition:

  • Produce extra virgin or flavored olive oils for premium markets.

  • Package table olives in retail-ready packs to increase earnings 2–3 times.

Economic Outlook

An acre of olives requires 120–150 seedlings at a cost of KSh 60,000–225,000. Once mature, yields range between 2–4 tonnes of fruit per year. At farm-gate prices of KSh 100–200 per kilo, that translates to KSh 200,000–800,000 per acre.

Value-added products such as olive oil (KSh 2,000–5,000 per liter) or packaged table olives (KSh 500–1,000 per kilo) can push revenues to KSh 1–2 million per acre.

Main costs per acre:

• Seedlings: KSh 60,000–225,000
• Fertilizers: KSh 10,000–20,000
• Irrigation & labor: KSh 50,000–100,000
• Total investment: KSh 150,000–400,000

Net returns: KSh 50,000–1.6 million per acre, depending on yields and processing.

Export markets (through platforms like Selina Wamucii) and local demand from hotels, supermarkets, and health-conscious consumers provide strong and stable demand.

Sustainability Tips

Long-term success in olive farming means adopting eco-friendly practices:

• Intercropping: Plant legumes or beans in the early years to boost soil fertility.
• Organic amendments: Apply compost or manure annually (KSh 2,000–5,000 per acre).
• Minimal tillage: Reduce soil disturbance and cover soil with mulch.
• Integrated pest management: Favor natural predators, resistant varieties, and limited sprays.
• Water conservation: Install rainwater harvesting systems (KSh 20,000–50,000) to cut irrigation costs.
• Certification: Organic certification through KOAN (KSh 30,000–50,000) opens premium export markets.

These approaches not only improve yields but also protect Kenya’s environment while keeping olive farming profitable.