Mississippi gardeners can plant potatoes in late winter for a spring harvest before summer heat arrives. Knowing exactly When To Plant Potatoes In Mississippi depends on your region and the last frost date, but a general rule is to plant 2-4 weeks before that date. This timing gives tubers time to grow in cool soil, avoiding the scorching summer that stops production.
Potatoes are a cool-season crop. They grow best when soil temperatures are between 45°F and 55°F. In Mississippi, that window opens in late February for southern parts and mid-March for northern areas. Plant too early, and cold, wet soil can rot the seed pieces. Plant too late, and heat stress will limit yields.
When To Plant Potatoes In Mississippi
The best time to plant potatoes in Mississippi is from mid-February to mid-March, depending on your location. Use this simple breakdown:
- Coastal and southern Mississippi (Zones 8b-9a): Plant between February 15 and March 1.
- Central Mississippi (Zone 8a): Plant between February 20 and March 10.
- Northern Mississippi (Zones 7b-8a): Plant between March 1 and March 20.
Check your local frost dates. The average last frost ranges from late March in the south to early April in the north. Plant seed potatoes about two weeks before that date, when soil is workable and not soggy.
Soil Temperature For Planting
Potatoes need soil that is at least 45°F at planting depth (4-6 inches). Use a soil thermometer to check. If soil is too cold, seed pieces may rot. If it’s too warm, growth is slow and disease risk rises.
To warm soil faster, cover beds with black plastic a week before planting. This can add 5-10°F to the soil temperature. Remove the plastic just before planting.
Regional Variations In Mississippi
Mississippi spans USDA zones 7b to 9a. Southern areas near the Gulf Coast have milder winters and earlier springs. Northern areas near Tennessee have colder winters and later springs. Adjust your planting date by about two weeks between the south and north.
For example, if you live in Biloxi, you can plant in late February. If you live in Tupelo, wait until mid-March. Always watch the weather forecast. A late cold snap can damage emerging shoots, so be ready to cover plants with row cover or straw.
Choosing The Right Potato Varieties
Not all potatoes grow well in Mississippi’s heat. Choose early or mid-season varieties that mature in 70-90 days. Late-season varieties may not finish before summer heat stops growth.
Best Varieties For Mississippi
- Yukon Gold: Early, buttery flavor, good for boiling and frying.
- Red Pontiac: Mid-season, red skin, white flesh, heat tolerant.
- Kennebec: Mid-season, white flesh, excellent for baking and chips.
- Irish Cobbler: Early, irregular shape, great flavor.
- Carola: Early, yellow flesh, good for roasting.
Avoid long-season varieties like Russet Burbank, which need 120+ days. They rarely produce well in Mississippi’s heat.
Seed Potatoes Vs. Grocery Store Potatoes
Always use certified seed potatoes from a garden center or online supplier. Grocery store potatoes may carry diseases or be treated with sprout inhibitors. Seed potatoes are disease-free and produce healthier plants.
If you must use grocery store potatoes, choose organic ones (less likely to be treated) and let them sprout in a cool, dark place for a week before planting.
Preparing The Soil For Potatoes
Potatoes grow best in loose, well-drained soil with a pH between 5.0 and 6.5. Mississippi soil is often acidic, so test your soil pH. If it’s below 5.0, add lime to raise it. If it’s above 6.5, add sulfur to lower it.
Steps To Prepare Soil
- Clear the area of weeds, rocks, and debris.
- Loosen soil to 12 inches deep using a tiller or garden fork.
- Mix in 2-4 inches of compost or aged manure to improve drainage and fertility.
- Add a balanced fertilizer (10-10-10) at a rate of 1-2 pounds per 100 square feet.
- Rake the soil smooth and create raised rows or mounds.
Raised beds or rows are ideal for Mississippi because they improve drainage and warm faster in spring. If your soil is heavy clay, consider growing potatoes in containers or grow bags.
Fertilizer Needs
Potatoes are heavy feeders. Apply a balanced fertilizer at planting time. Then side-dress with a nitrogen-rich fertilizer (like 34-0-0) when plants are 6 inches tall. Do not over-fertilize with nitrogen, or you’ll get lush leaves and small tubers.
Potassium is also important for tuber development. Use a fertilizer with potassium (the third number) or add wood ash to the soil.
How To Plant Potatoes
Planting potatoes is straightforward. Follow these steps for a successful crop.
Cutting Seed Potatoes
Cut seed potatoes into pieces about 1.5-2 ounces each. Each piece should have at least two “eyes” (buds). Let cut pieces dry for 24-48 hours in a cool, dry place. This forms a protective callus that prevents rot.
If seed potatoes are small (egg-sized), plant them whole. This reduces disease risk and produces more uniform plants.
Planting Depth And Spacing
- Dig trenches 4-6 inches deep, spaced 24-36 inches apart.
- Place seed pieces 8-12 inches apart in the trench, eyes facing up.
- Cover with 2-4 inches of soil. Do not fill the trench completely yet.
- Water thoroughly after planting.
As plants grow, gradually fill the trench with soil (hilling). This prevents sunlight from reaching tubers, which turns them green and toxic. Hill when plants are 6 inches tall, and again when they are 12 inches tall.
Watering After Planting
Keep soil evenly moist but not waterlogged. Potatoes need about 1-2 inches of water per week. In Mississippi’s spring rains, you may not need to water much. But during dry spells, water deeply once a week.
Mulch with straw or grass clippings to retain moisture and suppress weeds. Mulch also keeps soil cooler in late spring.
Caring For Potato Plants
Once planted, potatoes need regular care to produce a good harvest. Focus on watering, hilling, and pest control.
Hilling Potatoes
Hilling is critical for potato growth. It encourages more tubers to form along the buried stem and protects them from light. Hill every 2-3 weeks until plants are 12-15 inches tall.
To hill, pull soil from between rows up around the stems. Leave only the top 4-6 inches of leaves exposed. Use a hoe or shovel for this task.
Pest And Disease Management
Common potato pests in Mississippi include:
- Colorado potato beetle: Handpick adults and larvae. Use neem oil or spinosad if infestation is heavy.
- Aphids: Spray with insecticidal soap or strong water stream.
- Flea beetles: Use row covers early in the season.
- Wireworms: Rotate crops and avoid planting after grass or sod.
Diseases like early blight and late blight are common in humid weather. Prevent them by:
- Planting disease-resistant varieties.
- Watering at soil level, not on leaves.
- Providing good air circulation through proper spacing.
- Removing infected leaves immediately.
If blight appears, apply a copper-based fungicide. Remove and destroy severely infected plants.
Weed Control
Weeds compete with potatoes for water and nutrients. Keep the area weed-free, especially in the first 6 weeks. Mulch heavily to suppress weeds. Hand-pull weeds near the base of plants to avoid disturbing roots.
Harvesting Potatoes In Mississippi
Potatoes are ready to harvest 70-100 days after planting, depending on the variety. Harvest when the plants flower and then begin to yellow and die back.
When To Harvest
For “new” potatoes (small, tender), harvest about 2-3 weeks after plants flower. Gently dig around the base and remove a few tubers. Leave the plant to continue growing.
For full-sized storage potatoes, wait until the foliage dies back completely. Cut the stems to the ground and let the tubers sit in the soil for 1-2 weeks to cure. This toughens the skin for storage.
How To Harvest
- Use a garden fork or shovel to dig carefully, starting 12 inches from the plant.
- Lift the soil gently to avoid cutting or bruising tubers.
- Brush off excess soil, but do not wash them until ready to use.
- Sort out any damaged or diseased potatoes and use them first.
Harvest on a dry day. Wet soil can cause rot during storage.
Storing Potatoes
Proper storage extends the life of your harvest. Cure potatoes for 1-2 weeks in a dark, cool (50-60°F), humid place. After curing, store them in a dark, cool (40-50°F), well-ventilated area.
Do not store potatoes near apples or onions, as they release ethylene gas that causes sprouting. Check stored potatoes regularly and remove any that show signs of rot.
Common Storage Problems
- Greening: Caused by light exposure. Cut off green parts before eating.
- Sprouting: Caused by warm temperatures. Remove sprouts before cooking.
- Rot: Caused by moisture or damage. Discard affected potatoes.
In Mississippi’s humid climate, store potatoes in a root cellar, basement, or a cool closet. If you don’t have a cool space, store them in the refrigerator’s crisper drawer (but note that cold temperatures can convert starch to sugar, affecting taste).
Frequently Asked Questions
Can I Plant Potatoes In Fall In Mississippi?
Yes, you can plant potatoes in late summer for a fall harvest. Plant about 90 days before the first frost, which is usually mid-August to early September in Mississippi. Fall potatoes often have fewer pest problems, but yields may be lower due to heat stress during tuber formation.
What Is The Best Month To Plant Potatoes In Mississippi?
The best month is March for most of the state. Southern areas can plant in late February, while northern areas may wait until mid-March. Aim for soil temperatures above 45°F and a planting date 2-4 weeks before the last frost.
How Deep Should I Plant Potatoes In Mississippi?
Plant seed pieces 4-6 inches deep. Cover them with 2-4 inches of soil initially, then hill as they grow. This depth protects tubers from heat and light while allowing room for root development.
Do Potatoes Need Full Sun In Mississippi?
Yes, potatoes need at least 6-8 hours of direct sunlight daily. Full sun promotes strong growth and high yields. In Mississippi’s hot summers, some afternoon shade can help prevent heat stress, but morning sun is essential.
Can I Grow Potatoes In Containers In Mississippi?
Absolutely. Containers, grow bags, or buckets work well, especially for small spaces or poor soil. Use a 10-gallon container per plant, fill with loose potting soil, and follow the same planting and hilling steps. Container potatoes are easier to protect from heat and pests.
Final Tips For Success
Growing potatoes in Mississippi is rewarding if you time it right. Start with quality seed potatoes, prepare your soil well, and stay on top of watering and hilling. Watch for pests and diseases, and harvest at the right time for the best flavor and storage life.
Remember that Mississippi’s climate is unique. What works in one part of the state may not work in another. Keep a gardening journal to track your planting dates, weather patterns, and harvest results. Over time, you’ll learn the perfect timing for your specific location.
If you miss the spring planting window, don’t worry. You can try a fall crop, or plant a second batch in early summer for a late harvest. Experiment with different varieties to find which ones perform best in your garden.
Potatoes are a forgiving crop for beginners. With a little care, you’ll enjoy fresh, homegrown potatoes from your Mississippi garden. Happy planting.