How to Grow Potatoes in the Philippines

Why Grow Potatoes at Home?

Growing potatoes at home in the Philippines is a rewarding way to produce one of the world's most versatile vegetables. Potatoes or patatas are used in Filipino favourites like beef caldereta, chicken curry, and tortang patatas. The Philippines imports a large portion of its potato supply, so growing your own reduces dependence on imported produce.

Potatoes (Solanum tuberosum) grow best in cool highland areas like Benguet, Mountain Province, and Bukidnon where temperatures stay between 15 and 20 degrees Celsius. However, container gardeners in lowland areas can also experiment with potatoes during the cooler months from November to February using grow bags or large pots.

This guide covers everything from selecting seed potatoes to harvesting your crop. Whether you garden in Baguio or are trying potatoes in a Metro Manila balcony, the principles remain the same.

What You Need to Grow Potatoes

• Seed potatoes - Buy certified seed potatoes from agricultural supply stores. Avoid using grocery potatoes treated with sprout inhibitors.
• Large containers or garden bed - Grow bags (50 litre), sacks, or deep raised beds at least 30 cm deep.
• Loose, well-draining soil - Mix loam soil, compost, and rice hull in equal parts. Potatoes rot in heavy, waterlogged soil.
• Balanced fertiliser - 14-14-14 at planting plus potassium-rich fertiliser during tuber formation.
• Mulch material - Rice straw, dried leaves, or grass clippings for hilling and moisture retention.
• Cool growing location - Partial shade in lowland areas or full sun in highland areas.

Step-by-Step Guide to Growing Potatoes

Step 1: Select and Prepare Seed Potatoes

Choose firm, healthy seed potatoes with visible eyes (growth buds). Cut large seed potatoes into pieces weighing about 50 grams each, with at least 2 eyes per piece. Let the cut surfaces dry for 24 to 48 hours in a shaded area. This prevents rotting after planting. Small seed potatoes can be planted whole.

Step 2: Chit the Seed Potatoes

Place seed potatoes in a bright, cool location for 2 to 3 weeks before planting. This encourages sturdy green sprouts to form. Chitted potatoes establish faster and produce earlier harvests. Sprouts should be 1 to 2 cm long before planting.

Step 3: Prepare the Growing Area

For garden beds, dig trenches 15 cm deep and 60 cm apart. For containers, fill the bottom third with your soil mix. Potatoes need loose, airy soil to form tubers. Mix equal parts loam soil, aged compost, and carbonised rice hull for the ideal growing medium.

Step 4: Plant the Seed Potatoes

Place seed potato pieces 30 cm apart in the trench with the eyes facing up. Cover with 10 to 15 cm of soil mix. For containers, place 3 to 4 seed pieces per 50-litre grow bag. Water thoroughly after planting. Shoots will emerge in 10 to 14 days.

Step 5: Hill Up as Plants Grow

When potato shoots reach 15 to 20 cm tall, mound soil around the base of each plant, leaving only the top 5 to 8 cm of foliage exposed. This is called hilling and it encourages more tubers to form along the buried stem. Repeat hilling every 2 to 3 weeks until mounds are 25 to 30 cm high. For containers, simply add more soil mix as the plant grows.

Step 6: Water and Fertilise

Keep the soil consistently moist but never waterlogged. Water every 2 to 3 days during dry weather. Apply 14-14-14 fertiliser at planting and side dress with potassium-rich fertiliser (0-0-60 or wood ash) when plants start flowering. Flowering signals the start of tuber development.

Step 7: Monitor for Pests and Disease

Check plants weekly for late blight (dark spots on leaves), Colorado potato beetles, and aphids. Remove diseased leaves immediately. Spray with copper fungicide for blight prevention during humid weather. Practice crop rotation and never plant potatoes in the same spot two years in a row.

Potato Care Tips for Philippine Climate

Temperature Management

Potatoes prefer 15 to 20 degrees Celsius. In lowland areas, grow during the coolest months and provide 50% shade cloth during hot afternoons. Night temperatures below 25 degrees are critical for tuber formation. Highland gardeners can grow potatoes year-round.

Watering Schedule

Water deeply every 2 to 3 days. Reduce watering as plants yellow and die back before harvest. Overwatering during the final 2 weeks causes watery, low-quality tubers. Consistent moisture during flowering produces the largest tubers.

Fertilising

Potatoes are heavy feeders. Apply a balanced fertiliser at planting and top-dress with compost at each hilling. Avoid excess nitrogen which produces lush tops but small tubers. Potassium promotes tuber size and quality.

Common Problems When Growing Potatoes

Green Potatoes

Tubers exposed to sunlight turn green and produce solanine, a toxic compound. Prevent this by hilling soil around plants regularly and harvesting promptly. Never eat green potatoes. Cut away any green portions before cooking.

Late Blight

Late blight causes dark, water-soaked spots on leaves and stems during wet, humid weather. Remove infected foliage immediately. Spray copper fungicide every 7 days as prevention during the rainy season. Choose blight-resistant varieties when available.

Small Tubers

Small tubers result from high temperatures, insufficient hilling, or overcrowding. Plant at proper spacing, hill regularly, and grow during the coolest months available. Ensure adequate potassium levels in the soil for tuber enlargement.

Tuber Rot

Rot occurs in waterlogged soil or when cut seed potatoes are planted without drying. Improve drainage by adding rice hull or perlite to the soil mix. Allow cut seed potatoes to cure for 2 days before planting.

When to Harvest Potatoes

Potatoes are ready to harvest 90 to 120 days after planting. Watch for these signs of maturity.

• The plant foliage turns yellow and begins dying back naturally.
• Flowers have finished blooming (if the variety flowers).
• The skin of a test tuber does not rub off easily when pressed with your thumb.

Stop watering 2 weeks before harvest to toughen the skins. Dig carefully with a fork or trowel to avoid puncturing tubers. Let harvested potatoes dry in shade for a few hours before storing. Store in a cool, dark, well-ventilated place. Do not wash before storage.

For more detailed species information, visit our patatas (potato) plant guide page.

Frequently Asked Questions