Growing Potatoes in Tubs: Complete Container Guide

Yes, you can successfully grow potatoes in tubs with proper container selection, soil preparation, and care techniques. This complete guide reveals proven methods for harvesting abundant potatoes in limited spaces, including container specifications, variety recommendations, and step-by-step growing instructions that deliver results for beginners and experienced gardeners alike.

Why Container Potato Growing Works for Small Spaces

Container potato cultivation solves space limitations while offering superior soil control and pest management. Unlike traditional garden beds, tub growing prevents soil-borne diseases and gives urban gardeners, apartment dwellers, and renters access to homegrown potatoes. The USDA Agricultural Research Service confirms container methods yield comparable harvests to in-ground planting when proper techniques are followed.

Selecting the Perfect Container

Container size directly impacts your potato yield. Research from University of Minnesota Extension shows minimum requirements for successful tub growing:

Container Type	Minimum Size	Potato Quantity	Drainage Requirements
Plastic Tubs	15 gallons / 57L	2-3 seed potatoes	6-8 drainage holes (1/2" diameter)
Fabric Grow Bags	10-15 gallons / 38-57L	2 seed potatoes	Naturally breathable material
Wooden Crates	12"x12"x12" (30x30x30cm)	2 seed potatoes	Drill 10-12 holes bottom/sides

Avoid containers smaller than 10 gallons as they restrict root development and reduce yields by up to 40% according to Cornell University horticulture studies. Dark-colored containers require afternoon shade protection to prevent soil overheating.

Best Potato Varieties for Container Growing

Not all potatoes thrive in confined spaces. Early-season varieties mature faster and require less vertical space. The Royal Horticultural Society recommends these container-friendly varieties:

• Yukon Gold - Reliable producer with buttery flavor (70-90 days)
• Red Norland - Excellent for early harvests, vibrant skin (75-85 days)
• Caribe - Disease-resistant with smooth texture (70 days)
• All Blue - Unique purple flesh, good container performer (80-90 days)

Never use grocery store potatoes as seed stock. They're often treated with sprout inhibitors and may carry diseases. Certified seed potatoes from reputable suppliers like SeedPotato.com ensure disease-free planting stock.

Soil Preparation: The Foundation for Success

Container potatoes require loose, well-draining soil. Create this ideal mix:

• 60% high-quality potting mix (not garden soil)
• 30% compost or well-rotted manure
• 10% perlite or coarse sand
• 1 cup organic fertilizer per 5 gallons of mix

Fill your container one-third full with this mixture before planting. The soil pH should measure between 5.0-6.5 for optimal nutrient uptake. Test kits from garden centers provide accurate readings.

Planting Process: Step-by-Step Instructions

Follow this planting sequence for maximum yields:

1. Chitting: Place seed potatoes in egg cartons with eyes facing up 2-3 weeks before planting. Keep in bright, cool location (50-60°F/10-15°C) until sprouts reach 1" (2.5cm)
2. Planting: Position seed potatoes 4" (10cm) deep in soil mix, sprouts facing up. Cover with 3" (7.5cm) of soil
3. Hilling: When stems reach 6" (15cm) above soil, add more mix until only 2" (5cm) of growth remains visible. Repeat every 1-2 weeks
4. Final Fill: Stop hilling when container is nearly full, typically 4-6 weeks after planting

Watering and Fertilization Schedule

Container potatoes need consistent moisture without waterlogging. Follow this care timeline:

• Weeks 1-2: Water when top 1" (2.5cm) of soil feels dry (typically every 2-3 days)
• Weeks 3-6: Increase to daily watering as plants grow. Soil should feel like a damp sponge
• Weeks 7-10: Reduce watering 2 weeks before harvest to toughen skins

Apply balanced organic fertilizer (10-10-10) every 3 weeks during active growth. Container plants deplete nutrients faster than in-ground crops. Liquid seaweed extract provides essential micronutrients.

Troubleshooting Common Container Problems

Address these frequent container potato issues:

• Yellowing leaves: Usually indicates overwatering. Allow top inch of soil to dry between waterings
• Small tubers: Caused by insufficient hilling or overcrowding. Maintain proper spacing
• Pale foliage: Sign of nitrogen deficiency. Apply balanced fertilizer immediately
• Cracked potatoes: Result from irregular watering. Maintain consistent moisture levels

Prevent blight by removing affected leaves immediately and avoiding overhead watering. The Oregon State University Extension recommends copper fungicides for severe cases.

Harvesting and Storage Techniques

Harvest timing varies by variety:

• New potatoes: Dig 2-3 weeks after flowering for tender, small potatoes
• Main crop: Wait until foliage yellows and dies back completely (typically 90-120 days)

To harvest, carefully tip containers sideways on a tarp. Gently remove potatoes by hand, avoiding cuts or bruises. Cure main crop potatoes in a cool, dark, humid location (50-60°F/10-15°C) for 10-14 days before storage. Store cured potatoes in ventilated containers at 38-40°F (3-4°C) with 90% humidity.

Maximizing Your Container Potato Yields

Follow these professional tips for abundant harvests:

• Rotate container positions weekly for even sun exposure
• Use mulch to maintain consistent soil temperature
• Choose dwarf potato varieties for smaller containers
• Keep containers on casters for easy relocation during extreme weather
• Try the "straw method" - layer straw instead of soil for easier harvesting

With proper care, a single 15-gallon container typically yields 5-10 pounds of potatoes. The University of California Cooperative Extension reports container yields reaching 15 pounds in optimal conditions with high-performing varieties.

How many potatoes can I grow in a 15-gallon container?

A properly managed 15-gallon container typically yields 5-10 pounds of potatoes. Plant 2-3 seed potatoes maximum to avoid overcrowding, which reduces overall yield. University studies show yields can reach 15 pounds with optimal care and high-performing varieties like Yukon Gold.

Can I use regular garden soil in containers for potatoes?

No, regular garden soil compacts in containers, restricting root growth and drainage. Use a lightweight potting mix specifically formulated for containers. The ideal blend contains 60% potting mix, 30% compost, and 10% perlite or coarse sand to ensure proper aeration and drainage for healthy potato development.

How often should I water potatoes growing in containers?

Water container potatoes when the top inch of soil feels dry. During active growth (weeks 3-6), this typically means daily watering. The soil should feel like a damp sponge - never soggy or completely dry. Reduce watering 2 weeks before harvest to allow skins to toughen for better storage.

When is the best time to plant potatoes in containers?

Plant container potatoes 2-4 weeks before your last expected frost date when soil temperature reaches 45°F (7°C). In warmer climates, plant in early spring or late summer for fall harvest. Early varieties mature in 70-90 days, allowing for multiple plantings in longer growing seasons.

Why are my container-grown potatoes small?

Small potatoes typically result from overcrowding, insufficient hilling, or inconsistent watering. Ensure proper spacing (2-3 seed potatoes per 15-gallon container), regular hilling to encourage tuber formation, and consistent moisture levels. Nutrient deficiencies, particularly potassium, can also limit tuber size - apply balanced fertilizer every 3 weeks during growth.