Growing potatoes in bags is one of the most space-efficient and productive ways to produce a quality crop at home or in controlled professional trials.
Bag cultivation eliminates the need for large garden beds and gives you complete control over soil quality, drainage, and access. It's particularly useful in urban environments, for testing new varieties, or when soil contamination is a concern.
This guide covers the complete process, from selecting the right bags and preparing your planting mix through to harvest. You'll learn the specific techniques that maximise yield in containers and avoid the common mistakes that limit production.
The best bags for growing potatoes are breathable, durable, and sized between 40 and 80 litres. Fabric grow bags made from polypropylene or jute provide excellent drainage and air pruning of roots, which prevents spiralling and encourages a healthier root system.
After supplying terrain and landscaping materials across Australia for 48 years, All Stake Supply has seen professional growers transition from plastic containers to breathable options for improved crop health. The key is avoiding waterlogged conditions that cause tuber rot.
Avoid thin plastic bags or buckets without drainage. Potatoes need consistent moisture but cannot tolerate standing water, which encourages fungal disease and reduces yield.
A minimum of 40 litres is required per bag for a reasonable potato harvest. Bags between 50 and 80 litres offer the best balance of portability, soil volume, and yield potential.
Smaller bags dry out quickly and limit tuber development. Larger bags (100+ litres) can be unwieldy to move and require significantly more soil, increasing setup costs without proportional yield gains.
| Bag Size | Seed Potatoes | Typical Yield | Best Use |
|---|---|---|---|
| 40L | 2–3 | 1.5–2.5 kg | Balconies, tight spaces |
| 60L | 3–4 | 3–4 kg | Standard home production |
| 80L | 4–5 | 4–6 kg | High-yield trials, bulk planting |
Depth matters more than width. Bags should be at least 45cm deep to allow for adequate earthing up and to give tubers room to form without crowding.
Potato bags need to be at least 45cm deep, with 50–60cm being optimal for maximum tuber development. Shallow bags limit earthing-up potential and reduce the total number of tubers each plant can produce.
Potatoes form along the stem between the original seed piece and the soil surface. The more stem you can cover by progressively adding soil (earthing up), the more tubers develop.
Bags deeper than 60cm offer diminishing returns. Most potato varieties don't produce tubers below the 40–50cm mark, and excessively deep bags become difficult to manage.
The ideal mix for growing potatoes in bags is 60% premium potting mix, 30% well-aged compost, and 10% perlite or coarse sand for drainage. This combination provides structure, nutrients, and the free-draining environment potatoes require.
Avoid using straight garden soil. It compacts in bags, restricts root growth, and often contains weed seeds or disease spores that thrive in the confined environment.
Avoid fresh manure or nitrogen-heavy fertilisers early on. They promote excessive foliage growth at the expense of tuber development and increase disease risk.
Professional Tip: For commercial trials or landscape demonstration projects, maintain consistent soil mix across all bags. Variation in soil structure can skew results when comparing varieties or testing new rootstock performance.
Plant 3 to 4 seed potatoes per 60-litre bag, spaced evenly. Overcrowding reduces tuber size and increases competition for nutrients, while under-planting wastes space and soil resources.
For smaller 40-litre bags, reduce to 2 or 3 seed potatoes. Larger 80-litre bags can accommodate 4 to 5, provided they're spaced at least 15cm apart.
Bag growing suits early and second-early varieties particularly well. Maincrop varieties take longer to mature and often perform better in open ground where root systems can spread further.
Plant potatoes in bags from late winter through early spring in temperate Australian climates. Specific timing depends on your location and the variety you're growing.
Potatoes are a cool-season crop. They grow best when daytime temperatures are between 15°C and 22°C, with soil temperatures above 10°C for reliable sprouting.
One advantage of bag growing is mobility. You can move bags under cover to protect plants from late frosts or excessive summer heat, extending your planting window compared to in-ground crops.
The bag-growing process follows a predictable sequence that maximises tuber production while preventing common problems like greening or pest damage. Follow these steps for consistent results.
If placing bags on hard surfaces like concrete or paving, this 85gsm woven mat provides an effective base layer that suppresses weed growth beneath the bags while allowing water to drain freely. The 0.91m width suits typical bag dimensions and prevents soil contact with potentially contaminated surfaces.
As shoots emerge and grow to 15–20cm tall, add more soil to cover the lower stems, leaving 10cm of foliage exposed. Repeat this process every 2–3 weeks until the bag is filled to within 5cm of the rim.
Each earthing-up session encourages new tuber formation along the buried stem. This progressive filling is what makes bag growing so productive compared to traditional shallow planting.
Common Mistake: Filling the entire bag with soil at planting. This eliminates your ability to earth up progressively, cutting potential yield by 30–40%. Always start shallow and build up as the plant grows.
Water potatoes in bags when the top 3–5cm of soil feels dry to the touch. In typical spring conditions, this translates to every 2–3 days, increasing to daily during hot or windy weather.
Bags dry out faster than garden beds because they're exposed on all sides. Consistent moisture is essential, particularly once tubers begin forming (usually 6–8 weeks after planting).
Erratic watering causes tubers to crack or develop hollow hearts. Drip irrigation or timed watering systems work well for larger installations or professional trials where consistency matters.
For larger landscape projects requiring consistent ground cover around multiple growing areas, the 1.83m wide option is the most practical choice for covering pathways between bag rows in fewer runs with minimal wastage.
Yes, progressive earthing up is essential to maximise yield when growing potatoes in bags. Without it, you'll harvest significantly fewer tubers because they only form along the buried stem section.
The entire advantage of bag cultivation is the ability to build soil depth gradually, creating more stem length for tuber production. Skipping this step wastes the bag's potential.
Always leave at least 10cm of green foliage exposed. Burying the entire plant slows photosynthesis and reduces vigour.
According to research from Australia's Department of Agriculture, proper earthing-up techniques can increase per-plant yields by up to 40% compared to shallow planting methods, particularly in container systems where root expansion is naturally limited.
Early varieties mature in 10–12 weeks from planting. Second-early types take 13–15 weeks, and maincrop varieties require 16–20 weeks to reach full maturity.
Bag growing doesn't significantly speed up maturation, but it does allow earlier harvest of "new" potatoes. You can carefully reach into the bag and remove a few tubers once plants flower, leaving the rest to mature.
To harvest, simply tip the bag onto a tarp or clean surface. Tubers separate cleanly from the loose soil mix, making harvest faster and cleaner than digging in compacted ground.
For commercial-scale trials or landscaping demonstration gardens where multiple bags are used, laying out a heavier 110gsm option underneath provides a durable work surface that withstands repeated use across multiple growing seasons while keeping harvest areas clean and weed-free.
Quality fabric grow bags can be reused for 3–5 seasons if properly cleaned and stored. Soil should be completely refreshed between plantings to prevent nutrient depletion and disease carryover.
After harvest, shake out all soil and roots. Wash bags in a mild bleach solution (1 part bleach to 9 parts water), rinse thoroughly, and dry completely before storage.
Hessian and jute bags typically break down after one season but can be composted along with plant debris. They're particularly useful for single-use applications or where biodegradability is preferred.
For revegetation or erosion control projects where biodegradable ground cover is required alongside growing trials, natural jute matting at 620gsm offers excellent soil stabilisation while breaking down naturally over 12–18 months. This is especially useful in council or environmental projects where synthetic materials must be avoided.
Bag cultivation minimises many traditional potato-growing challenges, but a few issues still arise. Early recognition prevents yield loss and keeps plants healthy through to harvest.
If water pools on the soil surface after watering, drainage is inadequate. This promotes root rot and fungal disease.
Tubers exposed to light turn green and produce solanine, making them bitter and mildly toxic. Always maintain at least 5cm of soil coverage over developing tubers throughout the growing season.
Aphids cluster on new growth and can transmit viruses. Hose them off with water or use insecticidal soap for heavy infestations. Check plants weekly during active growth.
Bag growing naturally excludes many soil-borne pests like wireworms and nematodes, which is one of its key advantages over in-ground cultivation.
Growing potatoes in bags delivers reliable yields in limited space when you follow the fundamentals: use quality breathable bags at least 45cm deep, plant 3–4 seed potatoes per 60-litre bag, and progressively earth up as plants grow. Choose early varieties for fastest results, maintain consistent watering throughout tuber formation, and harvest once foliage dies back naturally.
All Stake Supply has supported Australian landscapers, councils, and horticulturalists with quality erosion control and ground protection materials for 48 years. Whether you're setting up demonstration gardens, running variety trials, or managing larger-scale container plantings, explore the full product range for professional-grade materials that deliver complete on-site performance.
For trade pricing on bulk orders or project-specific advice tailored to Australian conditions, contact the team at All Stake Supply's St Marys NSW warehouse. One order, full delivery, no partial shipments stalling your projects.
