How to Grow Potatoes in our Potato Grow Bag

Our Gardener's Best Potato Grow Bags are specialized fabric "pots" that make it possible to grow potatoes in almost any sunny location — even on a deck or a porch.

What You'll Need on Planting Day

  • Seed potatoes: You can buy them from us or provide your own. The regular Grow Bag holds three to five pieces; the Jumbo holds seven to 10.
  • Soil: The regular Grow Bag holds 50 quarts; the Jumbo holds about 120 quarts. If you like to use your own fertilizer, we recommend our Potting Mix or Organic Potting Mix.
  • Granular fertilizer: We recommend All-Purpose Fertilizer.
  • Water

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Planting Potatoes in a Grow Bag

Pick the site: Plant potatoes when the danger of frost has passed. Not sure of frost dates in your area? Contact your local Cooperative Extension Service or Master Gardener's Program. Select the sunniest site possible. All-day sun is best, but as little as 6 to 8 hours will do. Keep in mind that you will need to water the Potato Bag regularly, especially if rainfall is insufficient.

Prepare the soil: Put the soil in a wheelbarrow or tub that can hold it all at once. If you've chosen potting mix that does not have fertilizer in it, add granular fertilizer. Moisten the soil and mix thoroughly. About one-third of the soil will get used on planting day. The rest will be used as the plants grow. Set it aside.

If you are using the Gardener’s Best Potato Success Kit or the Gardener’s Best Deluxe Potato Success Kit hydrate the eco-coir in a wheelbarrow or tub that can hold 50 quarts at once. Once the brick has expanded to 10 quarts of fluffy mix, add the 2 20 quart bags of potting mix. Mix all 50 quarts together and moisten thoroughly. Since you are only using one third of the soil on planting day, use only one third of the All-Purpose Fertilize on the first day.

Prepare the seed potatoes: Cut the seed potatoes into five 2-ounce chunks — about the size of a lime. If your seed potatoes are small, you can plant them whole.

Plant the bag: Fold down the top edge of the bag to form a 4" cuff. Fill the bag with the moistened soil mixture until it's about 4" deep. Place the seed potatoes on the soil surface, spaced evenly. Cover with another 3" of soil.

Once the plants have grown to about 8″, it's time to add more soil. It's OK if some of the foliage gets buried. Unfold the edge of the bag and add about 4" of the soil mixture and water thoroughly. Allow the plants to grow, adding soil after they've grown another 8″. Repeat the process until all the soil mixture is used and the bag is full.

This unsual technique encourages the plants to make lots of potatoes, which form along the buried portions of stem.

Growing Potatoes

Water regularly: The porous fabric allows the Potato Bag to breathe, which prevents overheating and overwatering. However, it's important to monitor the moisture level in the bag because it can dry out quickly. The soil should feel moist, not soggy. In the hottest part of the summer, it might be necessary to water every day.

Potato beetleColorado potato beetle

Watch for pests: Colorado potato beetles are the most common pest. Inspect your plants regularly, looking under the leaves for the clusters of yellow eggs. If you see them, rub them off with your finger. Adult beetles are easy to identify — and control: Just pick them off with your hands and toss them into a bucket of soapy water. The beetles might bother your plants for a few weeks; just keep monitoring and hand-picking and your plants will be fine. For more options, read Controlling Colorado Beetles.

Potatoes, ready for harvestPotato plants usually look pretty shabby just before it's time to harvest.

Harvesting Potatoes

Look for the signs: Pay attention to watering and your plant will flower and grow vigorously through the summer. Toward the end of the season, however, the leaves will start yellowing and the stems will wilt. At this point, stop watering and wait a week or two. After that, the potatoes are ready to harvest.

Dump the bag: Empty the bag — plants, soil and all — into a wheelbarrow. Dig through the soil and pull out the potatoes. You can expect to harvest about 7 lbs. of potatoes, although you could get as much as 13 lbs. in a good year. Add the old soil to your garden or compost pile. Clean out the bag and save it for next year.

Last updated: 01/04/2023