Plant potatoes in a raised bed by layering soil, spacing seed potatoes 12 inches apart, and covering them as they grow

Potatoes grow well in raised beds because the soil warms faster in spring and drains better than ground soil. The basic method is straightforward: place seed potatoes on soil, cover them, and keep adding soil as the plants grow taller. This "hilling" process encourages more potatoes to form along the buried stem. A raised bed 12 inches deep works, though 18 inches gives you more room to hill without running out of space.

The timing matters. Plant seed potatoes when soil temperature reaches 45°F, which is usually 2 to 3 weeks before your last spring frost. In most regions this falls between mid-March and mid-May, depending on where you live. You can plant potatoes again in mid-summer for a fall harvest in cooler climates, but spring planting is the standard first crop.

Key Takeaways

  • Space seed potatoes 12 inches apart and 4 inches deep, with the cut side facing down if you cut them in half.
  • Add 4 to 6 inches of soil over the potatoes, then add more soil every 2 to 3 weeks as the plant grows, burying the lower leaves.
  • Raised beds drain water quickly, so water deeply when the top inch of soil feels dry, especially during flowering.
  • Harvest new potatoes 2 to 3 weeks after flowering by gently digging around the plant, or wait 2 to 3 weeks after the leaves die back for full-size potatoes.

Choosing and preparing seed potatoes

Use seed potatoes, not grocery store potatoes. Seed potatoes are certified disease-free and bred to sprout reliably. They cost $10 to $20 per 5-pound bag at garden centers or online. Each potato or piece of potato with at least one "eye" (a small indented bud) will sprout into a plant.

If your seed potatoes are larger than a golf ball, cut them in half 1 to 2 days before planting. Let the cut side dry slightly so it doesn't rot in wet soil. Plant the pieces cut-side down. Small potatoes can go in whole. One seed potato or piece produces one plant, which yields 1 to 3 pounds of potatoes depending on variety and growing conditions.

Spacing and planting depth

Fill your raised bed with 6 to 8 inches of soil before planting. Space seed potatoes 12 inches apart in rows, or scatter them evenly if you prefer. Plant each piece 4 inches deep, with the cut side or the end with the most eyes facing down. Press it gently into the soil so it makes contact, but do not bury it under a heavy weight.

If your raised bed is only 12 inches deep, you have room for one layer of potatoes. If it is 18 inches or deeper, you can plant a second layer 6 inches above the first, staggered so the upper potatoes sit between the lower ones. This doubles your yield in the same footprint, though the upper layer may not grow quite as large.

Hilling: the key to more potatoes

Hilling is the practice of burying the lower part of the potato plant as it grows. When you bury the stem, it sprouts new roots and new potatoes form along that buried section. This is why potatoes produce so much in a small space.

After planting, wait 2 to 3 weeks for sprouts to emerge above the soil. Once the plant is 6 to 8 inches tall, add 4 to 6 inches of fresh soil or compost around the base, burying the lower leaves. Repeat this every 2 to 3 weeks as the plant grows, until the soil reaches the top of your raised bed or the plant stops growing taller. Stop hilling once the plant flowers, as you risk damaging developing potatoes near the surface.

Watering and feeding

Raised beds dry out faster than in-ground gardens because water drains through the bottom. Water deeply when the top inch of soil feels dry to your touch—usually once or twice a week in warm weather, less in cool or rainy periods. Potatoes need consistent moisture, especially when flowering, but they rot if the soil stays waterlogged. If your bed has no drainage holes, drill a few in the bottom.

Potatoes are not heavy feeders if your soil is decent. If you filled the bed with compost or potting mix, you likely have enough nutrients for the season. If you used mostly topsoil, mix in 2 to 3 inches of compost before planting, or scatter a balanced fertilizer (like 10-10-10) around the plants once they are 6 inches tall, following the package rate. Avoid high-nitrogen fertilizers, which produce lots of leaves but fewer potatoes.

Recognizing pests and disease

The most common potato pest in raised beds is the Colorado potato beetle—a yellow-and-black striped beetle about the size of a ladybug. Hand-pick them and their orange egg clusters off the leaves, or spray with neem oil if the infestation is heavy. Aphids and flea beetles also feed on potato leaves but rarely cause serious damage in a home garden.

Powdery mildew appears as a white coating on leaves in humid conditions. It is unsightly but usually does not kill the plant. Improve air flow by spacing plants properly and water at the soil level, not overhead. If mildew is severe, spray with sulfur or a fungicide labeled for potatoes. Late blight, a serious disease that causes brown spots and stem rot, is rare in raised beds because they drain well and dry out faster than ground soil.

When and how to harvest

You can harvest new potatoes (small, thin-skinned potatoes) 2 to 3 weeks after the plant flowers. Gently dig around the base of the plant with your hands or a small shovel, feeling for potatoes without cutting them. Take what you find and push the soil back around the plant so it keeps growing. The plant will continue producing larger potatoes until the leaves die back.

For a full harvest of mature potatoes, wait until the leaves turn yellow and die back, usually 2 to 3 weeks after flowering stops. This takes 70 to 120 days from planting, depending on variety. Dig out all the soil and potatoes, spread them on a tarp to dry for a few hours, and store them in a cool, dark place. Potatoes keep for weeks or months in a basement or unheated garage, but not in a warm kitchen.

Choosing potato varieties for raised beds

Different potato varieties suit different uses and growing conditions. Russet potatoes are large, starchy, and good for baking or frying—they need 100+ days to mature. Red Norland and Kennebec are medium-sized, waxy potatoes that hold their shape when boiled, ready in 70 to 90 days. Fingerling varieties like Russian Banana are small and elongated, mature in 70 to 80 days, and are fun to grow because you get many potatoes per plant.

Early varieties (70 to 80 days) work well if you want to plant a second crop in mid-summer for fall harvest. Mid-season varieties (80 to 100 days) are reliable and widely available. Late varieties (100+ days) produce larger potatoes but need a longer growing season and are best in regions with cool summers. Check your seed catalog or the bag for the days to maturity and choose based on your climate and harvest date.

Frequently Asked Questions

Can I use regular grocery store potatoes as seed potatoes?

You can, but it is risky. Grocery store potatoes may carry diseases and are often treated with sprout inhibitors that prevent them from sprouting reliably. Seed potatoes are certified disease-free and cost only a few dollars more per pound. They are worth the small extra cost.

How many potatoes will one seed potato produce?

One seed potato or piece typically produces 1 to 3 pounds of potatoes, depending on variety, soil quality, water, and sunlight. Fingerling varieties often produce more individual potatoes but smaller ones. Russets produce fewer but larger potatoes.

What if I do not hill the potatoes?

Potatoes will still grow without hilling, but you will get fewer of them and they may turn green if exposed to sunlight. Hilling buries the stem so new potatoes form along it, multiplying your yield in the same space. It is the main reason potatoes do so well in raised beds.

Can I plant potatoes in containers instead of a raised bed?

Yes. Any container 12 inches deep or deeper with drainage holes works—a 5-gallon bucket, a large pot, or a fabric grow bag. Fill it with potting mix or compost, plant one seed potato, and hill as the plant grows. Containers dry out faster than raised beds, so check soil moisture more often.

Why are my potato leaves turning yellow before the plant flowers?

Early yellowing usually means the soil is too wet or too dry. Check that water drains from the bottom of the bed and that you are not watering every day. It can also mean the soil lacks nitrogen—scatter a balanced fertilizer around the plant and water it in. If only the lower leaves yellow while upper leaves stay green, that is normal as the plant matures.