Minnesota is often associated with cold and frigid temperatures, dazzling snowflakes, and hotdishes. Tourists flock to the state for winter sports and activities, with landscapes that look like they belong on a postcard. However, for plant growers, the weather can be a challenge, especially when it comes to planting sweet potatoes.
Sweet potatoes are a warm-season crop that requires at least 90 days of frost-free weather to mature. These crops need longer days and warmer temperatures to develop properly.
While it’s not impossible, growing sweet potatoes in the state of Minnesota can be a bit tricky. This is because sweet potatoes cannot survive in temperatures below 50 degrees Fahrenheit.
In general, these crops will take up a lot of space in your backyard, and these sweet potatoes would thrive and do better in warmer temperatures. However, if you’re mind is set on growing sweet potatoes in Minnesota, here are some tips on when to plant and how to take care of them.
When is the Best Time to Plant Sweet Potatoes in Minnesota?
Despite Minnesota’s rich and fertile soils, the state’s climate can be a bit challenging for sweet potatoes. The best time to plant sweet potatoes in Minnesota is in late May or early June – after the last frost date. In general, there’s no “exact” date on when you should plant sweet potatoes.
As a general rule of thumb, you should wait to plant sweet potatoes until the soil temperature is at least 60 degrees Fahrenheit. You should also wait for at least 2 weeks of frost-free weather.
If you plant too early during the spring, the sweet potatoes may not germinate or rot in the ground. Planting too late in the season can also be problematic as the sweet potatoes will not have enough time to mature properly. When this happens, you won’t be able to harvest before the first frost date.
In addition to waiting for the right time of year, you’ll also need to wait for the right time of day to plant sweet potatoes. Sweet potatoes should be planted in the morning or evening – never during the afternoon.
The afternoon sun can be too harsh and hot for young plants. If you plant them during the hottest part of the day, the sweet potatoes may not survive.
Planting Sweet Potatoes Minessota: Best Practices
As mentioned earlier, Minnesota growers may face a couple of challenges when growing sweet potatoes in this cold state. While you can’t control the weather, there are a couple of best practices that you can follow to increase your chances of success.
Start Planting Sweet Potatoes Indoors
One of the best things you can do is start your sweet potatoes indoors. This will give them a head start and allow them to get a jump on the growing season. You can start them in pots or flats about 6-8 weeks before the last frost date.
As soon as the weather warms up, you can transplant the sweet potatoes outside. Be sure to harden them off first by slowly acclimating them to the outdoors. This process can take about a week. Once they’re ready, you can plant them in your garden or backyard.
Use Black Plastic Mulch
Another great way to increase the chances of success is to use black plastic mulch. This type of mulch can help to increase the soil temperature and retain moisture. It will also prevent weeds from germinating and competing with your sweet potatoes for resources.
You can find black plastic mulch at most garden stores or online. Be sure to lay it down before you plant the sweet potatoes. Cut slits or holes in the plastic so that you can insert the plants.
Water Consistently and Fertilize Regularly
Sweet potatoes are a thirsty crop and will need to be watered regularly – especially during hot and dry periods. Be sure to water them deeply and evenly. They should receive about 1-2 inches of water per week.
In addition to watering, you’ll also need to fertilize the sweet potatoes on a regular basis. They’re heavy feeders and will benefit from organic fertilizer. You can either side-dress them or use a fertilizer with every watering.
Monitor Your Crops Regularly
Finally, it’s important to monitor your crops regularly. This includes checking for pests and diseases. Sweet potatoes are susceptible to a number of pests and diseases, especially in Minnesota.
Some of the most common problems include bacterial wilt, fusarium root rot, and insects such as the sweet potato weevil. If you notice any of these problems, be sure to take action immediately.
Be Prepared for a Short Growing Season
While there are a number of things that you can do to increase your chances of success, it’s important to remember that Minnesota has a short growing season. This means that you may not be able to grow all varieties of sweet potatoes.
Some of the best varieties for Minnesota include ‘Beauregard,’ ‘Georgiana,’ and ‘O’Henry.’ These varieties are all early maturing and have a shorter growing season.
Sweet potatoes Minnesota: Final Thoughts
Sweet potatoes are a delicious and nutritious crop that can be grown in Minnesota. However, it’s important to remember that this cold state has a short growing season.
This means that you’ll need to start your sweet potatoes indoors or choose a short-season variety.
A bit of patience goes a long way when growing sweet potatoes in Minnesota. By following the best practices, you’ll be able to successfully harvest and enjoy a delicious crop of sweet potatoes straight from your garden.
Related article: How to Grow Blueberries in Minnesota?