The Wonderful World of Irish Potatoes

 An Overview of Irish Potatoes in Kenya

Irish potatoes, scientifically known as Solanum tuberosum, are a type of crop that thrives in cool weather. They belong to the Solanaceae family, which includes other popular vegetables like tomatoes, capsicums, and eggplants. In Kenya, Irish potatoes are highly consumed and serve as both a staple food and a cash crop. Their production has been rapidly increasing due to factors such as urbanization and the growth of the fast food industry.

Versatile and Delicious: Different Ways to Enjoy Irish Potatoes

Irish potatoes can be prepared in various ways to complement a wide range of meals. They can be mashed, made into French fries, or baked to create tasty and satisfying dishes.

Major Growing Regions: Where Irish Potatoes Thrive in Kenya

Kenya boasts several prominent regions known for their successful Irish potato cultivation. These regions include Nyandarua, Nakuru, Elgeyo Marakwet, Meru, Nyeri, Kiambu, Taita Taveta, Narok, Bomet, Trans Nzoia, Bungoma, Uasin Gishu, West Pokot, Kisii, Nyamira, Kirinyaga, Murang’a, Baringo, Nandi, Laikipia, and Kericho.

Health and Nutrition Benefits: What Makes Irish Potatoes Nutritious

Irish potatoes offer a wealth of health benefits due to their rich nutritional profile. They are packed with vitamins, minerals, and essential organic compounds. Here are some of the advantages they provide:

1. Bone Health: Irish potatoes contain iron, calcium, phosphorous, magnesium, and zinc, which are vital for building and maintaining strong bones.

2. Heart Health: The significant fiber content in Irish potatoes helps lower cholesterol levels, reducing the risk of heart diseases.

3. Cognitive Function: Choline, found in Irish potatoes, supports memory, brain development, and muscle movement, among other benefits.

4. DNA Synthesis and Repair: Irish potatoes contain folate, which is essential for DNA synthesis and repair processes in the body.

5. Energy Metabolism: The presence of vitamin B6 in Irish potatoes plays a key role in energy metabolism by breaking down carbohydrates and proteins into glucose and amino acids, respectively, for easy absorption by the body.

6. Antioxidant Properties: Irish potatoes are a good source of vitamin C, carotenoids, and flavonoids, which act as antioxidants, protecting the body against harmful free radicals.

Important Note:

Avoid consuming green potato tubers, leaves, and fruits as they are toxic.

Ecological Requirements: Creating the Ideal Environment for Irish Potato Growth

To ensure optimal growth and productivity of Irish potatoes, certain ecological factors must be considered including:


Irish potatoes thrive in loose loamy and sandy loam soils that are well-drained, aerated, rich in organic matter, and have a pH range of 5-6.5. Impermeable soil layers that restrict root depth can negatively affect production. Mixing 1kg of HUMIPOWER® with basal fertilizers such as DAP, CAN, or TSP can improve soil structure when applying them.


Irish potatoes thrive in average daily temperatures ranging from 16 to 20 degrees Celsius. Tuber development is hindered if temperatures fall below 10 degrees Celsius or exceed 30 degrees Celsius. It is advisable to plant when temperatures are not too high to avoid delayed tuber initiation.


Irish potatoes thrive in regions with regular rainfall ranging from 850mm to 1400mm per year.


The ideal altitude range for Irish potato cultivation is between 1500 and 2800 meters above sea level.

Selecting the Right Seeds: Factors to Consider

Choosing the right seeds is crucial for successful Irish potato cultivation. There is a wide variety of seeds available, each with its unique characteristics. Consider the following factors during seed selection:

1. Yield Potential
2. Maturity Period
3. Pest and Disease Tolerance
4. Tuber Characteristics
5. Intended Purpose of the Produce

Field Operations: Key Steps for Successful Irish Potato Cultivation

Land Preparation

Prepare the land by ploughing it at least twice, ensuring the soil is suitable for optimal productivity. Remove both broadleaf and grass weeds by using CATAPULT® 480SL, a systemic non-selective weedkiller.


Irish potatoes are commonly grown from seed potatoes (tubers or pieces of tubers). Use disease-free and well-sprouted tubers for optimal production. Follow these steps:

1. Create hilled rows (ridges) on the prepared land.
2. Mix soil with manure and DAP, and consider adding 1kg of HUMIPOWER® with 50kg of DAP or 1 ton of manure to improve nutrient uptake and root development.
3. Place the seeds 12 inches apart and cover them with approximately 3 inches of soil.


  • Soaking seeds in OPTIMIZER® for 1-2 hours can promote faster and uniform germination.
  • Maintain moist soil without waterlogging.
  • Germination usually occurs within 21-27 days after planting.


Dig furrows at a spacing of 75cm between each furrow and about 30cm between each seed.

Ridging/Earthing Up

Mound soil from between the rows around the main stem of the crop to maintain an upright posture, prevent pests like the potato tuber moth from accessing the tubers, and suppress weed growth.


Irish potatoes are sensitive to water stress, especially during the middle and late stages of growth. Maintain adequate soil moisture to prevent misshapen tubers and low yields.

Weed Control

Weeds compete with Irish potatoes for nutrients and water, and can harbor pathogens that can damage the crop. Proper weed control is crucial for the crop’s success. Use CATAPULT® 480SL during land preparation and HOTLINE® 450SC prior to transplanting to minimize weed development throughout the season.

Crop Rotation

Implement crop rotation with non-solanaceous crops like cereals and brassicas to manage pests and diseases by interrupting their development cycles.

Manure and Fertilizer Application

Apply 50kg of DAP or TSP per acre during planting to provide phosphorous for early developmental stages. Two weeks after emergence, spray young plants with LAVENDER SUPER STARTER® or GOLDCHANCE SUPER START® to promote rapid root development and increase resistance to infections and weather stress. Top-dress the crop with 50kg of CAN per acre after 3 to 4 weeks, and after 4 to 5 weeks, apply 100kg per acre. Consider spraying the crop with GOLDCHANCE SUPER GROWTH® or LAVENDER SUPER GROWTH & VEGETATIVE® to enhance vegetative growth and overall crop health. To promote quality tuber production, spray the crop with GOLDCHANCE SUPER FLOWERS & FRUITS®, DIMIPHITE®, GOLDCHANCE MULTISUPER K®, or LAVENDER SUPER FLOWERS & FRUITS®.


  • Conduct soil testing to determine soil fertility.
  • Mix basal fertilizers with HUMIPOWER® at a rate of 1kg of HUMIPOWER® per 50kg of fertilizer.
  • Apply OPTIMIZER® biostimulant at any growth phase of the crop.
  • Manure application is essential for soils with low organic matter content.

Major Pests and Diseases: Safeguarding Irish Potatoes


Irish potatoes are susceptible to various pests that can damage the crop. Implement appropriate pest management strategies using the following pesticides:

  • Tuber Moths: Use ESCORT® 19EC, BACIGUARD® 16WDG, OCCASION STAR® 200SC, or LEXUS® 247SC.
  • Root Knot Nematodes: Drench the planting holes with ALONZE® 50EC or mix basal fertilizer with ADVENTURE® 0.5GR.
  • Leafminers: Apply ALONZE® 50EC, ESCORT® 19EC, LEXUS® 247SC, or OCCASION STAR® 200SC.
  • Aphids: Utilize KINGCODE ELITE® 50EC, PENTAGON® 50EC, or LEXUS® 247SC. To control sooty mold, spray JAMBO CLEAN®.
  • Whiteflies: Use TAURUS® 500SP, LEXUS® 247SC, or KINGCODE ELITE® 50EC. JAMBO CLEAN® can be applied to combat sooty mold.


Irish potatoes are vulnerable to various diseases that can hamper their growth. Employ these strategies for disease management:

  • Late Blight: Spray GEARLOCK TURBO® 250WP, FORTRESS GOLD® 720WP, or TOWER® 720WP.
  • Bacterial Wilt: Drench with GREENCOP® 500WP.
  • Potato Leaf Roll: Use KINGCODE ELITE® 50EC, PENTAGON® 50EC, or LEXUS® 247SC to control aphid vectors.
  • Fusarium Wilt: Drench with GREENCOP® 500WP and use PYRAMID® 700WP or ABSOLUTE® 375SC as foliar sprays.
  • Early Blight: Apply FORTRESS GOLD® 720WP, TOWER® 720WP, RANSOM® 600WP, or ABSOLUTE® 375SC.
Tips for Pest and Disease Management
  • Use recommended pesticides.
  • Select tolerant and resistant varieties.
  • Implement crop protection practices.
  • Plant healthy and certified tubers.
  • Maintain field sanitation.
  • Ensure timely and proper weed control.
  • Provide adequate spacing.
  • Plant early.
  • Practice proper crop nutrition.

Harvesting and Post-Harvest Handling: Ensuring Quality and Preservation

Harvesting: Harvest Irish potatoes when they reach maturity, indicated by yellowing leaves and easy separation of tubers from their stolons. Use a fork, plough, or potato harvester depending on the scale of production. Remove the vines 1-2 weeks before digging up the tubers to facilitate harvesting.

Post-Harvest Handling: Take precautions to avoid tuber injuries that may serve as entry points for storage pathogens. Harvest on dry days, but if the soil is too wet, air-dry the potatoes before packaging. Tubers meant for storage should be left in the soil to allow their skins to thicken, preventing water loss and storage pathogens.

Avoid leaving them for too long to prevent the development of black scurf, a fungal incrustation. Sort the potatoes before storage to remove spoiled ones and preserve the healthy ones.


  • Avoid storing tubers with ethylene-producing produce like bananas.
  • Do not store tubers in refrigerators.
  • Wash tubers right before use to extend their shelf life.
  • Curing harvested potato tubers is crucial for healing any cuts or bruises.
  • Provide good air circulation in the storage room.
  • Fully grown Irish potatoes can be stored for up to two months.

Conclusion: A Successful Journey with Irish Potatoes

Cultivating Irish potatoes can be a rewarding endeavor. By considering the ecological requirements, selecting the right seeds, implementing effective field operations, managing pests and diseases, and practicing proper post-harvest handling, you can enjoy a bountiful harvest of this versatile and nutritious crop.

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