Grow Potatoes in Grow Bags in Your Small Space

If you haven't experience the almost child-like joy of digging for potato treasure because you live in a small space or apartment, then growing taters in containers is for YOU! I’ll run through what works for me on my Balcony.

When do I plant my seed potatoes?

Firstly, as with any growing in your small space, check your grow zone to know when the right time to get the spuds into the ground is. You can read our blog, Know Your Grow Zone which is a great place to start. The timing for planting potatoes in containers is similar to that when planting into the ground. If you're in a frost-prone area and receive frost in your small space, you will want to plant them before the last expected frost, and you can continue through into Summer.

When to plant
Warm climates: Plant between March and April. If the area is frost-free, plant in autumn. 
Cool climates: Plant between July and August. 
Frosty areas: Wait until after the last frost. 
Temperate zones: Plant in early spring or late winter. 

Harvesting time 
Warm climates: Harvest between June and August.
Cool climates: Harvest between December and February.

Where do I buy my potato seeds?

The safest and best-quality potatoes are grown from "seeds" that are not seeds but tubers that are potatoes. Some gardeners use potatoes from the greengrocer, and often, these are sprayed to stop sprouting (a bit unsightly on a store shelf) and may harbour diseases. Purchase your certified Seed Potatoes from reputable online and garden stores.

What container should I use?

Growing potatoes in large pots and my favourite Root Pouch grow bags is a big YASSS!! Root Pouch fabric grow bags are lightweight, environmentally friendly, and made of spun recycled BPA-free plastic water bottles. They have been tested food-safe against the USFDA food safety guidelines and are free-draining - essential to prevent tuber rot. 

For Root Pouch grow bag potato growing, consider the 30 Litre grow bag to grow 2-3 seed potatoes (you will only get a small yield in small bags) through to the 76-Litre to our Garden Bed sizes (you'll get a larger yield the bigger the bag)  to plant 4-6 seed potatoes or one of the Root Pouch Raised Garden Beds for a huge crop! As a rough guide, each potato plant needs about 10 litres of soil. Overplanting a container will lead to small or deformed fruit. Plants will struggle to thrive and may even fail to produce a crop. Find out more about the range of Root Pouch grow bags HERE

Which variety of potato should I plant?

Know the difference between indeterminate and determinate potatoes!
Determinate potatoes are varieties with tubers that grow in just one layer. For this reason, the plants do not require mounding the soil around them. They produce early, in about 70 to 90 days. Indeterminate potatoes grow in multiple layers, so it is important to mound soil around the plants. This will give you a better yield. Indeterminate potatoes produce late crops, 110 to 135 days out.

This planting guide will focus on planting indeterminate potatoes using the rolled grow bag method.

Preparing your seed potatoes

Some folk wait for the taters to sprout shoots before planting them whole; others plant the seed potatoes immediately.  If the potato seeds are large and you have the space for lots of Potatoes to grow at the same time, cut whole seed potatoes into pieces a little larger than a large egg, each with one or two "eye" buds on them. Then, place them into a supportive container such as an egg carton and keep them in a light but relatively cool place to produce stubby shoots.

Soil and planting

A high-quality potting mix that is rich and free draining is acceptable for growing medium for potatoes in bags. Potato plants need nitrogen and potassium in the soil to set tubers and produce enough carbohydrates for the tubers to grow into sizable potatoes. Compost has been known to be a better medium than commercial potting mixes for this purpose, however, obtaining or home-making compost in a small urban space can be challenging for some, so a good quality potting mix will suffice.

If you are mixing your own, a good mix is 1/3 good quality finished compost, 1/3 vermiculite or perlite, and 1/3 coconut coir or peat moss.
For good measure, you can also add a couple of handfuls of organic fertilisers, such as chicken manure pellets.

I'm now focusing on using the hilling method in a grow bag. If using a rigid container, follow the same principle of layering the soil and leaves. 

Planting Indeterminate Potatoes: 

 Fold or roll the sides of the bag down until they are about half the height; you will unroll/fold this as you build the soil up around the leafy tops. Fill the bag with at least 10cm of mix or compost and set the seed potatoes in the potting soil. Place the seed potatoes evenly in the container. Cover the potatoes with a layer of soil to fully cover them, and water well.

Once your potato plants have grown about 10cm, you must "hill" them. This is done by adding about 5cm of potting mix, compost or something like pea straw around your potato plants, covering the growing stems at the bottom. Be careful not to break the plants in the process. The goal is to bury about one-third of the plant, covering the lower leaves with soil. The buried stems will produce more potatoes, so this hilling procedure is essential to a good harvest.

You must repeat this hilling process by opening your bag a few more times as your plants grow. You can also stop once the soil reaches the top of your container.

If planting determinate potatoes, bury the seeds, cover them with soil, and feed them throughout the growing season.

Watering and Feeding

Potatoes will not grow without sun and water. Overwatering will result in rotting tubers, and underwatering will result in lower potato yield. Remember that one of the keys to growing potatoes is keeping your soil moist, not wet. Potatoes do not like long hours of hot, direct sunlight day after day. If your space is scorching hot, you may want to partially shade your plants, which is the beauty of growing potatoes in a grow bag —they can generally be easy to shift!

Ensure your container receives at least six to eight hours of sun daily. If you have used a fresh potting mix, sufficient nutrients will be in that mix to sustain the plants for the months stipulated on the potting mix bag. Add a pelleted slow-release fertiliser at the start of spring when the plants start growing to care for the plants and support their growth. Add fertiliser every 6-8 weeks during the growing season to maximise productivity. Liquid fertilisers should only be used as a top-up supplementary feed; they wash out quickly and aren't long-acting.

Plants use the nutrient phosphorus for root formation, stem growth, and fruiting, so it's particularly important to all root crops, including potatoes. Therefore, it's best to use a balanced fertiliser that typically contains ample phosphorus and provides all necessary nutrients in the right amounts.

Fertilisers such as chicken manure or blood & bone are particularly phosphorus-rich and are great for use around root crops.

Potatoes are usually ready to harvest in 15-20 weeks or 4-5 months after planting. Depending on the timing, potatoes can be harvested early while the plant is still growing in January; or wait until Summer ends, and Autumn nears when the potato leaves and stems begin to turn yellow. You can also harvest potatoes any time after the plants have flowered. When the foliage has died back and cooler weather sets in, stop watering about two weeks before harvest.

Reach down into the soil of your container and pull out a few new potatoes at a time. Then, as the plants turn yellow and die back late in the season, you can harvest all the remaining potatoes at once. The easiest way is to turn the grow bag or container out.

Enjoy being an Urban Potato farmer!

Rose of NSW  - Urban Root Pouch Grow Bag Farmer

Teach them where their food comes from!

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