Missouri potato planting aligns with soil temperatures around 45°F in early April. Knowing when to plant potatoes in missouri is the key to a successful harvest. This guide gives you the exact timing and steps you need.
Potatoes are a cool-season crop. They grow best when the soil is cold but not frozen. Plant them too early, and they rot. Plant them too late, and the heat stunts their growth.
When To Plant Potatoes In Missouri
The best time to plant potatoes in Missouri is from mid-March to mid-April. This window depends on your specific location within the state. The soil temperature must reach at least 45°F at a depth of 4 inches.
Missouri has two main growing zones. Northern Missouri (zones 5b-6a) should plant later. Southern Missouri (zones 6b-7a) can plant earlier. Use a soil thermometer to check the temperature. Do not rely only on the calendar.
Soil Temperature Is Your Guide
Soil temperature matters more than the date. Potatoes need cool soil to start. If the soil is too wet or cold, the seed pieces will rot. Wait until the soil crumbles easily in your hand.
Check the soil temperature at 4 inches deep. Do this in the morning. The temperature should be consistently above 45°F for several days. A cold snap after planting can damage the sprouts.
Regional Planting Windows For Missouri
Here are the general planting windows for different parts of Missouri:
- Southern Missouri (Springfield, Joplin, Poplar Bluff): Plant from mid-March to early April.
- Central Missouri (Columbia, Jefferson City, St. Louis): Plant from late March to mid-April.
- Northern Missouri (Kansas City, St. Joseph, Kirksville): Plant from early April to late April.
These are guidelines. Always check your local frost dates. Potatoes can survive a light frost, but hard freezes will kill the tops. The soil temperature is your final decision maker.
How To Prepare Your Potato Bed
Good preparation leads to strong growth. Potatoes need loose, well-draining soil. They also need full sun for at least 6 hours a day.
Choose The Right Seed Potatoes
Use certified seed potatoes from a garden center. Do not use grocery store potatoes. They may carry diseases. Seed potatoes are treated to prevent rot.
Cut large seed potatoes into pieces. Each piece should have at least 2 eyes. Let the cut pieces dry for 24 hours before planting. This prevents rotting in the ground.
Prepare The Soil
Loosen the soil to a depth of 8 to 10 inches. Remove rocks and large clumps. Mix in 2 to 3 inches of compost or well-rotted manure. Potatoes need potassium and phosphorus, not too much nitrogen.
Test your soil pH. Potatoes prefer a pH between 5.0 and 6.0. If your soil is too alkaline, add sulfur. If it is too acidic, add lime. A soil test kit is cheap and easy to use.
Planting Depth And Spacing
Dig a trench 4 to 6 inches deep. Place the seed potato pieces 12 inches apart. Cover them with 2 to 3 inches of soil. Do not fill the trench completely yet.
Rows should be 2 to 3 feet apart. This gives the plants room to grow. It also makes hilling easier later in the season.
Caring For Your Potato Plants
Potatoes need consistent care after planting. Water, hilling, and pest control are all important. Follow these steps for a healthy crop.
Watering Requirements
Potatoes need 1 to 2 inches of water per week. Keep the soil evenly moist but not soggy. Water deeply once a week rather than lightly every day.
Inconsistent watering causes misshapen tubers. It also leads to cracks and hollow heart. Mulch around the plants to retain moisture and keep the soil cool.
Hilling The Plants
Hilling is essential for potato growth. When the plants are 6 to 8 inches tall, pull soil up around the stems. Leave only the top 3 to 4 inches of leaves exposed.
Hill the plants again when they reach 12 inches tall. This prevents the tubers from turning green. Green potatoes are toxic and should not be eaten.
Fertilizing
Potatoes are heavy feeders. Apply a balanced fertilizer at planting time. Use a 10-10-10 or 5-10-10 formula. Side-dress with fertilizer when the plants are 6 inches tall.
Do not over-fertilize with nitrogen. Too much nitrogen produces lush foliage but few tubers. Phosphorus and potassium are more important for tuber development.
Common Pests And Diseases
Potatoes face several pests and diseases in Missouri. Early detection is key to managing them. Here are the most common problems.
Colorado Potato Beetle
This is the most common pest. The beetles are yellow with black stripes. They eat the leaves and can defoliate a plant quickly.
Hand-pick the beetles and larvae off the plants. Drop them into a bucket of soapy water. Neem oil or insecticidal soap can also help. Rotate your crops each year to reduce infestations.
Late Blight
Late blight is a fungal disease that caused the Irish Potato Famine. It appears as dark, water-soaked spots on leaves. It spreads quickly in wet weather.
Plant resistant varieties if possible. Avoid overhead watering. Remove and destroy infected plants immediately. Do not compost them.
Scab
Scab causes rough, corky spots on the potato skin. It does not affect the taste, but it makes the potatoes look ugly. Scab is caused by a bacteria in the soil.
Keep the soil pH below 6.0 to prevent scab. Do not add lime to the potato bed. Also, keep the soil consistently moist during tuber formation.
When To Harvest Potatoes In Missouri
Harvest time depends on the variety and when you planted. Most potatoes are ready 70 to 100 days after planting. You can harvest new potatoes earlier.
New Potatoes
New potatoes are small, tender tubers. Harvest them 2 to 3 weeks after the plants flower. Gently dig around the base of the plant and take a few tubers.
New potatoes do not store well. Eat them within a few days. They are perfect for boiling or roasting.
Main Crop Potatoes
Main crop potatoes are fully mature. Wait until the vines die back completely. Cut the vines off at ground level and wait 2 weeks before digging.
This waiting period allows the skins to thicken. Thicker skins mean better storage. Dig the potatoes on a dry day. Let them cure in a dark, cool place for 10 to 14 days.
Storing Your Potato Harvest
Proper storage extends the life of your potatoes. Store them in a cool, dark, and well-ventilated place. The ideal temperature is 40°F to 50°F.
Do not wash the potatoes before storing. Brush off excess dirt. Store them in burlap sacks or paper bags. Plastic bags trap moisture and cause rot.
Check your stored potatoes regularly. Remove any that are sprouting or rotting. One bad potato can spoil the whole batch.
Best Potato Varieties For Missouri
Some potato varieties perform better in Missouri’s climate. Choose varieties that are disease-resistant and suited to your growing zone.
- Yukon Gold: A popular yellow potato. It is versatile and grows well in Missouri.
- Red Norland: An early red potato. It is resistant to scab and produces well.
- Kennebec: A white potato good for baking and frying. It stores well.
- Russet Burbank: The classic baking potato. It needs a longer growing season.
- Purple Majesty: A fun purple potato. It is high in antioxidants.
Try planting a mix of early and late varieties. This extends your harvest window. It also gives you different textures and flavors.
Tips For Success
Here are some extra tips to help you succeed with your potato crop:
- Rotate your potato patch every year. Do not plant potatoes in the same spot for 3 to 4 years.
- Do not plant potatoes where tomatoes, peppers, or eggplants grew last year. They share diseases.
- Use a soil thermometer. It is the most reliable way to know when to plant.
- Mulch heavily with straw to keep the soil cool and moist.
- Water deeply during dry spells. Potatoes need consistent moisture.
Potatoes are a rewarding crop for Missouri gardeners. With the right timing and care, you can enjoy a bountiful harvest. Start preparing your soil now, and you will be ready to plant when the time is right.
Frequently Asked Questions
Can I Plant Potatoes In Missouri In The Fall?
Fall planting is possible in southern Missouri. Plant in late August or early September. The soil is warm, but the days are getting shorter. Harvest before the first hard frost. This method works best for early maturing varieties.
What Happens If I Plant Potatoes Too Early In Missouri?
Planting too early can cause the seed pieces to rot in cold, wet soil. The sprouts may also be killed by a hard freeze. Wait until the soil temperature is consistently above 45°F. It is better to plant a week late than a week early.
How Deep Should I Plant Potatoes In Missouri?
Plant seed pieces 4 to 6 inches deep. Cover them with 2 to 3 inches of soil initially. As the plants grow, hill soil up around the stems. This protects the developing tubers from sunlight and pests.
Do Potatoes Need Full Sun In Missouri?
Yes, potatoes need at least 6 hours of direct sunlight each day. Full sun promotes strong growth and high yields. Partial shade will result in fewer and smaller tubers. Choose a sunny spot in your garden.
Can I Grow Potatoes In Containers In Missouri?
Yes, container gardening works well for potatoes. Use a large pot or grow bag that is at least 15 gallons. Fill it with loose potting soil. Plant 2 to 3 seed pieces per container. Hill the soil as the plants grow. Water more frequently in containers.
Growing potatoes in Missouri is simple when you follow the right steps. The key is watching the soil temperature and planting at the right time. With a little patience and care, you will have fresh, homegrown potatoes to enjoy all season long.