How To Grow Red Potatoes

Learning how to grow red potatoes is a rewarding project for any gardener. Growing red potatoes successfully begins with choosing certified seed potatoes and providing them with loose, well-draining soil. This guide will walk you through every step, from planting to harvest.

Red potatoes are known for their smooth, waxy texture and thin skin. They hold their shape well after cooking. With the right care, you can enjoy a bountiful crop from your own backyard.

This section covers the complete growing cycle. We will start with the essential preparations before planting. Then, we will move through each phase of care.

Choosing Your Seed Potatoes

Always begin with certified seed potatoes from a reputable supplier. Certified seed is guaranteed to be disease-free, which is crucial for a healthy harvest. Do not use potatoes from the grocery store, as they are often treated with sprout inhibitors.

Look for seed potatoes that are firm and have several “eyes.” The eyes are the small dimples where sprouts will emerge. You can plant whole small potatoes or cut larger ones into pieces.

How To Cut Seed Potatoes

If you cut seed potatoes, each piece should be about the size of a golf ball. Ensure each piece has at least one or two strong eyes. This step is important for maximizing your seed stock.

Use a clean, sharp knife.
Cut the potato a day or two before planting.
Let the cut pieces “cure” in a cool, airy place. This allows the cut surfaces to dry and form a callus, which helps prevent rot once planted.

Preparing The Planting Site

Potatoes need full sun, at least six to eight hours of direct sunlight per day. The soil is the most critical factor. Red potatoes thrive in loose, well-draining soil that is slightly acidic.

Heavy clay soil can lead to misshapen tubers and rot. If your soil is compacted, you will need to amend it. Raised beds or grow bags are excellent alternatives for poor soil.

Ideal Soil Conditions

The perfect soil for potatoes is loose and rich in organic matter. A pH between 5.0 and 6.0 is ideal. You can test your soil with a simple kit from a garden center.

Work the soil to a depth of at least 12 inches.
Mix in several inches of compost or well-rotted manure. This improves drainage and fertility.
Avoid using fresh manure, as it can promote scab disease on the potato skins.

Planting Red Potatoes Correctly

Timing is key when you plant. Potatoes are a cool-weather crop. Plant them about 2-4 weeks before your last expected spring frost date. The soil temperature should be around 45-50°F.

There are a few common planting methods: trenches, holes, or containers. The principle is the same: you will gradually cover the growing plant with soil.

The Trench Method

This is the most traditional way to plant potatoes. It makes the later “hilling” process straightforward.

Dig a straight trench 6-8 inches deep.
Space trenches about 2-3 feet apart.
Place seed potato pieces in the trench, cut-side down, with the eyes facing upward.
Space the pieces 12 inches apart within the row.
Cover the seed pieces with 4 inches of soil. Do not fill the trench completely yet.

Watering And Fertilizing Needs

Consistent moisture is vital, especially from the time the plants flower until near harvest. Potatoes need about 1-2 inches of water per week. Inconsistent watering can cause the tubers to crack or become knobby.

Water deeply at the base of the plants. Avoid overhead watering if possible, as wet foliage can encourage fungal diseases like blight. Early morning is the best time to water.

Fertilizer Schedule

Potatoes are moderate feeders. They benefit from a balanced fertilizer at planting and a phosphorus boost later for tuber development.

At Planting: Mix a balanced, slow-release organic fertilizer into the soil at the bottom of your trench or hole.
Mid-Season: When plants are about 6 inches tall, side-dress with a fertilizer higher in phosphorus (the middle number on the bag). Bone meal is a good organic option.
Avoid high-nitrogen fertilizers later in the season, as they promote leafy growth at the expense of potatoes.

The Importance Of Hilling

Hilling is the process of mounding soil around the base of the potato plant as it grows. This practice is essential for several reasons. It protects developing tubers from sunlight, which turns them green and toxic.

It also encourages the plant to produce more potatoes along the buried stem. It supports the plant and helps with weed control. You should hill your potatoes 2-3 times during the season.

How To Hill Potatoes

Wait until the plants are about 6-8 inches tall.
Using a hoe or your hands, gently pull loose soil from between the rows to mound it against the plant’s stem.
Cover about half of the exposed stem, leaving the top leaves uncovered.
Repeat the process every few weeks until the plants begin to flower. The final hill should be a mound about 6-8 inches high.

Managing Pests And Diseases

Keeping your plants healthy is the best defense. Common pests include the Colorado potato beetle, aphids, and wireworms. Diseases to watch for include early and late blight, which affect the leaves.

Regular inspection is crucial. Check the undersides of leaves for insect eggs or larvae. Remove any pests you find by hand and drop them into soapy water.

Preventative Strategies

Crop Rotation: Never plant potatoes in the same spot two years in a row. Rotate with unrelated crops like beans or corn.
Clean Seed: This is why certified seed potatoes are non-negotiable.
Good Airflow: Proper spacing and hilling help foliage dry quickly after rain.
Remove Weeds: Weeds compete for nutrients and can harbor pests.

Knowing When To Harvest

You can harvest “new” red potatoes about 2-3 weeks after the plants finish flowering. These are small, tender potatoes with very thin skins. For mature, storage potatoes, wait until the plant’s foliage turns yellow and begins to die back.

To check for maturity, gently dig around the base of one plant with your fingers. If the potato skins are firm and don’t rub off easily, they are ready. If the skins are delicate, give them more time.

Harvesting Steps

Choose a dry day to harvest.
Use a digging fork or shovel, but insert it into the soil well away from the plant’s center to avoid spearing tubers.
Lift the plant gently and shake off the soil. Search through the soil by hand for any remaining potatoes.
Handle the harvested potatoes carefully to avoid bruising.

Curing And Storing Your Harvest

Proper curing is essential for potatoes you plan to store. Curing thickens the skin, which helps them last for months. Do not wash potatoes before curing or storing; just brush off excess dirt.

Place the potatoes in a single layer in a dark, well-ventilated place with high humidity. A garage or basement often works well. The ideal curing temperature is 45-60°F for about 10-14 days.

Long-Term Storage Tips

After curing, sort the potatoes. Remove any that are damaged or have green skins (which contain solanine and should not be eaten).
Store perfect potatoes in a cool, dark place (ideally 38-40°F).
Use cardboard boxes, paper bags, or burlap sacks. Avoid airtight plastic containers.
Check your stored potatoes every few weeks and remove any that are starting to soften or sprout.

Common Problems And Solutions

Even with good care, you might encounter some issues. Here are quick fixes for the most frequent problems gardeners face.

Green Potato Skins

This is caused by exposure to sunlight, either on the tuber in the ground or after harvest. Green parts contain solanine, which is bitter and can be toxic in large amounts. Always hill your plants properly and store potatoes in complete darkness. You can cut away small green spots before cooking, but discard potatoes that are extensively green.

Hollow Heart Or Cracked Tubers

Hollow heart is a cavity inside the potato, often caused by rapid growth from uneven watering or excess fertilizer. Cracking is also a result of irregular moisture. The solution is consistent, deep watering throughout the season, especially during tuber bulking. Adding organic matter to the soil helps it retain even moisture.

Scabby Potato Patches

Scab appears as rough, corky patches on the potato skin. It is a soil-borne disease that is more cosmetic than harmful; you can peel affected areas. To prevent it next year, lower your soil pH by adding sulfur, avoid using wood ash or lime, and ensure good soil moisture at tuber set. Choose scab-resistant varieties if it’s a persistent problem.

FAQ About Growing Red Potatoes

Here are answers to some of the most common questions about growing red potatoes.

Can You Grow Red Potatoes From Store Bought?

It is not recommended. Supermarket potatoes are often treated with a sprout inhibitor, which can prevent growth. They also may carry diseases that could infect your garden soil. For a reliable harvest, always invest in certified disease-free seed potatoes.

How Long Do Red Potatoes Take To Grow?

Most red potato varieties are “mid-season,” meaning they mature in 80-100 days from planting. You can harvest small new potatoes earlier, around 60-70 days. The exact time depends on your climate and the specific variety you choose.

Do Red Potatoes Need Full Sun?

Yes, red potatoes require full sun for best production. This means a minimum of six hours of direct, unfiltered sunlight each day. More sun leads to stronger plants and a better yeild. In very hot climates, some afternoon shade can be beneficial.

How Deep Should You Plant Red Potatoes?

Plant seed potato pieces about 4 inches deep initially. Through the process of hilling, you will eventually mound soil up to 8 inches or more around the stem. The total depth where tubers form can be up to a foot in loose soil, which gives them plenty of room to develop.

Can You Grow Red Potatoes In Containers?

Absolutely. Growing in large containers, fabric grow bags, or even a stack of tires is a great option. Ensure the container is at least 18 inches deep and wide and has excellent drainage. Use a high-quality potting mix and follow the same guidelines for watering and hilling, adding more soil as the plants grow.