Yes, you can grow potatoes indoors (But it’s not as easy as it sounds)

Okay, so you want to grow potatoes indoors. Maybe you don’t have the room outdoors, or the weather just isn’t right to grow them any other way. The good news is that growing potatoes indoors is very possible. The bad news is that it’s probably harder than you think. And harvests aren’t going to be as good as outdoors. However, now that we’ve covered the ‘bad’ – let’s look at how to get it working for you.

quick reality check

We’ll start with a quick reality check. Growing potatoes indoors is fun. It’s probably not going to feed you year-round. Not unless you fill a whole room with grow lights and containers. So, especially initially, see it as a fun hobby with benefits. Maybe, once you’ve got your first harvest in the bag, you can think about growing more. You’re going to need a big pot. At least 10-15 gallons (40-60l). You’ll also need excellent, strong LED grow lights.

Realistic yields will be somewhere around 3-6 lb per container if you get your light, water, and temperature right.

What to buy

1. Container: 10–15 gal breathable fabric grow bag + saucer/caddy.
2. Lights: Full-spectrum LED that can hit the canopy with ~300–500 µmol/m²/s. (As a shortcut: a quality 150–200 W LED over one 10–15 gal pot is plenty.) Add a plug-in timer.
3. Air: Small clip fan for gentle airflow.
4. Cheap digital thermo-hygrometer. This is a little device that measures temperature and humidity in the air around your plants.
5. Seed potatoes (certified): early/mid options for indoor speed. Good picks:
   • Dark Red Norland (early)
   • Yukon Gem (early/mid, better blight tolerance than Yukon Gold)
   • Elba
   • Defender (reliable, blight-tolerant maincrops that still do fine in pots).
6. Soil mix (loose and rich):
   • 40% quality potting mix (peat-free if you can)
   • 30% finished compost
   • 20% aged manure or worm castings
   • 10% perlite (or coarse sand)
7. Fertilizer: slow-release organic at planting + a high-potassium “tomato” feed for later.
8. Mulch: straw/sugarcane/shredded leaves.
9. Sticky traps (fungus gnats), neem/insecticidal soap (aphids/spider mites).

Phew! Quite a list, huh. Now that that’s done, let’s (finally) get growing.

Pre-sprout (“chit”) your seed

One to two weeks before planting, set your seed potatoes in a cool bright spot (55–65°F / 13–18°C). Let sturdy stubby sprouts form. If your seed potatoes are large, cut them into egg-sized pieces with 2+ eyes, then let the cut surfaces dry/callus for 24-48 hours.

Plant the potatoes

1. Put 4-6 inches of the soil mix in the bottom.
2. Mix a handful of slow-release fertilizer into the soil.
3. Place 2-3 seed pieces (sprouts up) evenly spaced on top
4. Cover with 4-6 inches of mix.
5. Water to evenly moisten the soil (not swampy).

Light & environment (this is where most people fail)

These are the conditions you’re aiming for:

• Photoperiod: 14-16 hours ON / 8-10 OFF (use the timer).
• Light height: Keep the LED 12-18″ above the tops. Adjust to avoid leaf scorch.
• Target intensity: ~300-500 µmol/m²/s at the leaves. Don’t stress too much. If you’re using a decent 150-200 W fixture over a single pot at 12-18″, you’re close.
• Temp: Day 65-72°F (18-22°C) / Night 55-65°F (13-18°C). Hotter nights = poor tuber set.
• Airflow: Put the small fan on low, not blasting the leaves.

Using Your Thermo-Hygrometer

That little gadget helps you get the temperature and humidity just right. Here’s what to aim for:

Temperature

Ideal range:

• Day: 65-72°F (18-22°C)
• Night: 55-65°F (13-18°C)

If it’s too hot (above ~75°F / 24°C), your plants might look just fine, but tuber formation slows or stops altogether. You can fix the temperature by raising the grow lights a few inches, running a small fan, or cracking a window. You may need to move the pot to a cooler room like the basement.

If it’s too cold (below ~50°F / 10°C), growth slows dramatically and sprouting stalls. You can fix this by moving the potatoes to a warmer room, adding a small heater nearby, or using a heating mat under the container.

Humidity

Ideal range: 50-70% relative humidity.

If the humidity is lower, you may encourage spider mites. Leaves might curl up. Fix it with a tray or water with pebbles near the pot. Group plants together or run a small humidifier.

If the humidity is higher, you’re risking stagnant air and blight/fungal issues like leaf spots and mold. Fix it by increasing airflow with a fan, water less often, and make sure lights aren’t too close. They can heat the leaves and create condensation.

Rule of thumb:

• Keep the dial in the middle (65°F, 60% RH).
• If the numbers drift, don’t panic. Small tweaks (light height, a fan, a tray of water) usually get you back in range quickly.

Watering & feeding

Keep the soil evenly moist. If you can lift the pot and it feels light, water it. Deep soak until you get a bit of runoff, then let the excess water rain. In a warm room, you can expect to water 2-3x a week. Start feeding at week 3 with a balanced fertilizer. Fertilize every 2 weeks. Switch to a higher-K fertilizer (like a tomato feed) at first flowering. Stop heavy feeding once the plants start to yellow naturally. This means they’re close to harvest.

Hill and mulch (protects tubers, boosts yield)

Hilling and mulching protects your tubers and boosts yields. When the stems reach 6-8″, add 2-3″ of soil mix around them. Repeat every time they stretch again until you’re near the rim. Top with 1-2″ of mulch to keep the surface cool and damp. Never let light hit the developing tubers or they’ll turn green.

Pest & problem control indoors

Indoor potatoes have problems of their own, even though it can be easier to monitor things than in the garden. Here are some common issues:

• Fungus gnats: sticky traps + let the top inch dry between waterings.
• Aphids/spider mites: inspect underside of leaves weekly; hit early with insecticidal soap or neem; increase humidity slightly and airflow.
• Leggy plants: more light or lower the fixture.
• No tubers forming: nights too warm (>70°F / 21°C) or too much nitrogen. Cool it down and switch to a higher K.
• Wilting midday: under-watering or heat from lights. Deepen water in the morning and give slight shade gap between LEDs and canopy.

I’ve also got a special guide you can check out: Problems growing potatoes in containers.

Indoor Potato timing (rough guide)

• Days 0–14: Sprouts emerge. Keep lights close.
• Days 15–35: Hill twice; start biweekly feeds.
• Days 40–65: Flowering; tubers bulk. Keep temps in range.
• Days 60–80 (earlies): You can “bandicoot” a few new potatoes by gently digging at the side without uprooting the plant.
• Days 85–110 (most maincrops): Foliage yellows naturally. Stop watering for 5-7 days to set skins, then harvest.

Harvest, cure & store

• Tip the bag onto a tarp and hand-pick spuds (you won’t miss any).
• Cure for 7-14 days in the dark at 45-60°F (7-16°C) with good airflow. The skins toughen, and minor scrapes will heal.
• Store in the dark at 42-50°F (6-10°C). If it’s warmer, they’ll break dormancy and sprout. If it’s colder (like the fridge), their starch turns to sugar. You’ll get a sweeter taste, but fries go dark brown because the sugars caramelize. You can sometimes “recondition” them by bringing them back to room temp for a couple weeks, but the flavor and fry color don’t always recover fully.
• Keep them out of light. Light is always bad in storage. Even low light causes potatoes to turn green (chlorophyll) and produce solanine (that bitter, mildly toxic compound).

Potato Varieties that Suit indoor Growing

• Fast/early: Dark Red Norland, Yukon Gem (quicker payoff, smaller plants).
• More resilient: Elba, Defender (handle humidity/blight better; fine in big bags).
• Fun options: small fingerlings (e.g., Russian Banana). Great flavor, but slower growers.

What do you think, are you brave enough to give it a go? Please let us know how you went!