How to Grow Potato at Home in Grow Bags (Aloo): Plant to Dig
Here’s how to grow potato at home in one sentence: plant small sprouted aloo, or pieces with a strong eye, in a deep grow bag in October or November, keep piling soil over the stems as they grow, and dig your crop about 100 to 120 days later, when the leaves yellow and fall over. Potatoes are not grown from true seed at home. They’re grown from tubers, and the “fruit” people ask about is a green berry you should never eat.
Before you start
- Plant: whole sprouted tubers about the size of an egg (40 to 50 g), or cut pieces with an eye
- Months (Punjab and Delhi plains): October to November
- Container: a 30 to 40 litre grow bag (about 15 inch wide, 15 inch deep) for 3 tubers
- Sun: 6 hours or more, cool weather
- Harvest: new potatoes from about 10 weeks; main crop 100 to 120 days
- Honest yield: a few meals per bag, not a season’s supply
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When should you plant potato in Pakistan and North India?
Potato is a cool-season crop. Tubers form well in mild days and cool nights and stall once the weather turns hot. So the timing changes by zone:
| Zone | Plant | Note |
|---|---|---|
| Punjab plains: Lahore, Faisalabad, Delhi | October to mid November | Cover on frost nights in late December and January |
| Hot dry: Multan, Bahawalpur, Sukkur | Late October to November | Dig before March heat |
| Coastal humid: Karachi | November to December | Short window, choose early varieties |
| Sub-humid: Islamabad, Peshawar | October, or February for a spring crop | Frost is the main risk |
| Hills | March to April | The summer crop that feeds the plains’ off season |
Our month-by-month sowing calendar shows where potato fits with peas, garlic and methi.
Which “seed” works: shop aloo or seed potato?
Certified seed potato from an agriculture supply shop is the safe choice: it’s checked for virus disease. Kitchen aloo will often grow too, but some are treated to stop sprouting and some carry disease. If you use them, pick firm, unwrinkled tubers that have already sprouted on their own. Throw out anything soft, green or rotting.
- Chit them: spread tubers in a tray in bright, indirect light for two to three weeks until short, thick, green or purple sprouts appear. Long white sprouts from a dark cupboard snap easily.
- Cut big ones: a large tuber can be cut into pieces about 1 to 2 inch across, each with at least one good eye.
- Let cuts heal: leave cut pieces in shade for 3 to 5 days so the surface dries and seals. Fresh cuts rot in damp soil.
- Plant shallow first: put 10 to 15 cm of mix in the bag, set 3 tubers sprouts up, and cover with 8 to 10 cm of mix.
- Water once well, then only when the top few cm feel dry.
The rolled-down bag trick
Roll the top of a grow bag down to half height before planting. Each time the stems grow 15 to 20 cm, unroll a little and add mix until only the top few leaves show. You earth up without a spade, and the bag gives you depth exactly when the plant needs it. Stop once the bag is full.
Pot size, mix and why you keep adding soil
Tubers form on the buried stem, above the seed piece, so depth equals crop. A 30 to 40 litre bag or a 15 inch deep pot suits three tubers; a 20 litre bucket suits one or two. Use a loose mix: 2 parts garden soil, 1 part compost, 1 part cocopeat or sand (see our potting mix ratio). Heavy clay gives knobbly, cracked potatoes.
Earthing up matters for two reasons. It gives tubers room. And it keeps light off them: a potato that sees the sun turns green, and the green parts are toxic and bitter. Growers also earth up around two months after planting so the potato tuber moth can’t lay eggs on exposed tubers.
Watering and feeding through the season
Keep the mix evenly moist, like a squeezed sponge. In October and November that may be every 3 to 4 days for a bag in sun; in the coldest weeks, once a week. Uneven water (bone dry, then flooded) causes cracked and hollow tubers. Before a forecast frost night, water in the afternoon and cover the plants with a sheet or sack; frost blackens potato leaves overnight.
Mix two handfuls of compost into the bag at planting, then add one more handful when you first earth up. If leaves look pale after six weeks, a balanced NPK at the label’s rate helps. Skip high-nitrogen feeding later on: it grows leaves, not potatoes.
Yellow leaves, no potatoes and other problems
| Problem | Likely cause | What to do |
|---|---|---|
| Lower leaves yellow at 3 to 4 months | Natural dying back | Stop watering, harvest in 2 weeks |
| Yellow early, soggy mix | Overwatering | Check holes, let it dry a little |
| Dark patches, white fuzz under leaves, fast collapse | Late blight, worst in cool damp spells | Remove and bin the plant, don’t compost it |
| Curled, sticky leaves | Aphids | Hose off, then a neem oil spray |
| Stems cut at soil level | Cutworms | Search the soil at dusk, pick them out |
| Big leaves, tiny tubers | Too much nitrogen, too hot, too shallow | Plant earlier, add depth, feed less |
“Why is my potato plant not fruiting?” usually means no tubers. The plant’s own small green berries after flowering are not the crop, and many varieties never make them.
When are potatoes ready to dig?
- New potatoes: from about 10 weeks, once flowering starts. Feel gently in the side of the bag and take a few egg-sized ones.
- Main crop: 100 to 120 days. When most leaves have yellowed and flopped, stop watering. Wait about two weeks so the skins firm up.
- Dig on a dry day: tip the bag onto a sheet. Let tubers sit in light shade for an hour or two so the soil falls off, then store them in the dark.
Never eat green patches; cut them away generously, and bin any very green tuber. Our green potato guide explains why, and the summer storage guide keeps your crop from sprouting.
Grow it or skip it?
Grow it for the fun and for new potatoes you can’t buy this fresh. It’s a great children’s crop because the dig is a treasure hunt. Skip it if you hope to save money: aloo is cheap and a bag gives a few meals. Ground beds beat pots for quantity; a roof is fine with grow bags. Next easy crops are in our first five plants guide and the Kitchen Garden hub.
Potato leaves, stems, berries and green tubers are poisonous to people and pets, so keep toddlers and dogs away from the plants and never let children eat the small green berries. If a child eats any and vomits, has stomach pain or seems drowsy, get medical help straight away. Wear gloves for soil work. Read every label in full if you ever spray a chemical, wear a mask and gloves, keep people and pets out, and observe the waiting days before digging.
Potato growing questions
Can I grow potatoes from store-bought potatoes?
Often yes, if they have already sprouted and are firm and healthy. Some shop potatoes are treated against sprouting or carry disease, so certified seed potato is the safer bet.
How many potatoes can one plant give?
It varies hugely with variety, depth and weather. In a home bag, think a small handful to a big bowl per plant, not kilos.
What is the best time to plant potatoes in Pakistan?
October to mid November in the Punjab plains, November to December in Karachi, and March to April in the hills.
How deep should a pot for potatoes be?
At least 30 to 40 cm (12 to 15 inch). Deeper is better because tubers form on the buried stem as you earth up.
Should I cut off potato flowers?
You don’t need to. Flowers are a sign that new potatoes are forming underneath. Removing them makes little difference at home.
Why are my potato leaves turning yellow?
Near the end of the season it’s normal dying back. Earlier, check for soggy soil, poor feeding, or blight if dark patches appear.
Are potato plant berries edible?
No. The small green berries are poisonous. Keep them away from children and pets.
Can potatoes grow in summer in Lahore?
Not well. Once days turn hot, tuber growth stalls. Plan for the cool season, or the hills.
Do I need to dry potatoes after digging?
A brief dry in shade so soil falls off is enough at home. Then store them cool and dark, never in sunlight.