Planting Sunflowers in Minnesota

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planting Sunflowers in Minnesota

Timing the Planting Sunflowers in Minnesota

Planting Sunflowers in Minnesota, with their vibrant petals and towering stalks, are not only a symbol of summer but also a favorite among gardeners and nature enthusiasts. However, growing these iconic flowers in Minnesota, with its short growing season and unpredictable weather, can be a challenge. Yet, with the use of innovative grow bags, gardeners in the Land of 10,000 Lakes can successfully cultivate these towering beauties and enjoy a stunning display of sunflowers. In this article, we will delve into the art of planting sunflowers in grow bags, focusing on the perfect timing for a bountiful bloom.

Skip ahead to check out MEG’s sunflowers here!

Understanding Sunflower Growing Seasons

Sunflowers are warm-season flowers, and their growing season is crucial for a successful harvest. Key considerations include:

  • Last Spring Frost Date: In Minnesota, the last spring frost typically occurs mid May. Planting sunflowers in Minnesota before this date can expose them to frost damage.
  • First Fall Frost Date: The first fall frost in Minnesota usually arrives in late September to early October, marking the end of the growing season for most plants, including sunflowers.
  • Ideal Growing Temperature: Sunflowers thrive in warm temperatures, with an optimal range of 70°F to 78°F (21°C to 26°C).

Harnessing Grow Bags for Sunflower Cultivation

Grow bags offer an innovative solution to the challenges of growing sunflowers in Minnesota. Here’s how grow bags can be advantageous for sunflower cultivation:

  • Mobility: Grow bags are portable, allowing you to move them to find the best sunlight or protect your sunflowers from adverse weather conditions.
  • Temperature Control: The soil in grow bags warms up more quickly in the spring, enabling earlier planting. They can also be moved indoors in the fall to extend the growing season.
  • Soil Quality: You have control over the soil quality in grow bags, ensuring optimal conditions for seed germination and sunflower growth.
  • Space Efficiency: Grow bags are ideal for small spaces, making them suitable for urban gardeners with limited garden real estate.

Optimal Timing for Planting Sunflowers in Minnesota

The flexibility of grow bags gives gardeners more control over planting schedules. Here’s a detailed guide on when to plant sunflower seeds in Minnesota using grow bags:

1. Early Spring Planting (April)

  • As the last spring frost passes (usually late April to early May), you can start sowing sunflower seeds in grow bags. The warmer soil inside the bags allows for earlier planting and germination.
  • Opt for sunflower varieties with shorter maturity periods, like ‘Dwarf Sunflower’ or ‘Music Box,’ for early spring planting.

2. Late Spring Sowing (May)

  • Continue sowing sunflower seeds in grow bags throughout May to ensure a staggered bloom that extends through summer and into fall.

3. Preparing for Fall Bloom (July)

  • In early July, consider sowing another batch of sunflower seeds in grow bags. These sunflowers will be ready for a stunning late summer and fall display.

4. Preparing for Overwintering (August)

  • For those interested in overwintering sunflowers, sow seeds in early August. The resulting sunflowers can be left in the bags and will continue to bloom throughout the winter.

Tips for Successful Sunflower Planting in Minnesota

To maximize the success of your sunflower planting in grow bags, keep these tips in mind:

  • Soil Preparation: Use a high-quality potting mix with good drainage and aeration properties. Sunflowers require well-draining soil to prevent root rot.
  • Proper Watering: Maintain consistent moisture in the grow bags. Sunflowers need regular watering to support their rapid growth.
  • Support: Sunflowers can grow tall and may require support to prevent them from toppling over. Stakes or trellises can provide the necessary support.
  • Spacing: Sow sunflower seeds with appropriate spacing, as overcrowding can lead to stunted growth and smaller blooms.
  • Mulching: Applying a layer of mulch over the soil in the grow bags helps conserve moisture, regulates soil temperature, and reduces weed growth. Mulch also prevents the soil from drying out too quickly.
  • Pest and Disease Control: Regularly inspect your sunflowers for signs of pests or diseases. Common sunflower pests include aphids and caterpillars. Employ organic pest control methods to protect your sunflowers.
  • Companion Planting: Sunflowers can benefit from companion planting. Consider planting them alongside other flowers or herbs that help deter pests and improve overall garden health.
  • Protection from Cold (Fall): As autumn approaches, consider using row covers or frost cloth to protect your sunflowers from the cold and frost. This allows you to continue enjoying their blooms well into the fall and early winter.

Harvesting and Storing Sunflowers

While sunflowers are primarily ornamental, they can be enjoyed as cut flowers. Here’s how to harvest and care for cut sunflowers:

  • Harvest: Cut sunflowers for arrangements early in the morning when they are well-hydrated. Use sharp, clean scissors or pruning shears to make clean cuts. Choose sunflowers with fully opened petals and a sturdy stem.
  • Cleaning: Remove any leaves that will be below the waterline in your vase to prevent bacterial growth. Recut the stems at an angle under running water to ensure they can take up water.
  • Storage: Place cut sunflowers in a vase filled with fresh water and floral preservative. Change the water every few days to extend the vase life of your sunflower arrangements.


Cultivating sunflowers in Minnesota can be a joyful and rewarding experience with the use of grow bags, which provide control over planting dates and environmental conditions. By considering the state’s growing seasons and taking advantage of the benefits of grow bags, gardeners can enjoy a prolonged and vibrant display of these iconic flowers. Whether you’re seeking the beauty of early spring blooms or looking to extend your sunflower garden well into the fall and winter, grow bags provide a practical solution for growing striking homegrown sunflowers in the Land of 10,000 Lakes.