Growing Lettuce in Minnesota

Posted on Category:Local
Growing Lettuce in Minnesota

A Guide to Planting Lettuce in Grow Bags

Lettuce, with its vibrant green leaves and crisp texture, is a staple in many salads and dishes. But cultivating this leafy green in the challenging climate of Minnesota, characterized by cold winters and short growing seasons, can be quite a task. However, by using grow bags, gardeners in Minnesota can overcome these challenges and enjoy the freshness of homegrown lettuce. In this article, we’ll delve into the nuances of planting lettuce in grow bags, focusing on the optimal timing for a successful harvest.

Skip ahead to see MEG’s lettuce varieties here.

Understanding Lettuce Growing Seasons

Lettuce is a cool-season crop, and timing is essential when planting it in Minnesota. Key considerations include:

  • Last Spring Frost Date: The last spring frost in Minnesota typically occurs mid May. It’s crucial to plant lettuce after this date to prevent frost damage to young plants.
  • First Fall Frost Date: The first fall frost usually arrives in late September to early October, marking the end of the growing season for most plants, including lettuce.
  • Ideal Growing Temperature: Lettuce thrives in cooler temperatures and prefers soil temperatures between 45°F and 75°F (7°C to 24°C) for optimal growth.

Harnessing Grow Bags for Lettuce Cultivation

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

  • Mobility: Grow bags are portable, allowing you to move them to find the best sunlight or protect your lettuce from adverse weather conditions.
  • Temperature Control: The soil in grow bags warms up more quickly in the spring, enabling earlier planting. You can also move the bags 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 lettuce growth.
  • Space Efficiency: Grow bags are ideal for small spaces, making them suitable for urban gardeners with limited garden space.

Optimal Timing for Planting Lettuce in Grow Bags

The flexibility of grow bags gives gardeners more control over planting schedules. Here’s a detailed guide on when to plant lettuce 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 lettuce seeds in grow bags. The soil inside the bags warms up more quickly compared to open ground, allowing for earlier planting.
  • Choose lettuce varieties known for their resistance to cold, like ‘Butterhead’ or ‘Romaine.’ These types are ideal for early spring planting.

2. Late Spring Sowing (May)

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

3. Preparing for Fall Harvest (July)

  • In early July, consider sowing another round of lettuce seeds in grow bags. These lettuce plants will be ready for harvest in the fall, extending your lettuce season.

4. Preparing for Winter (August)

  • If you’re interested in overwintering lettuce, sow seeds in early August. The resulting lettuce can be left in the grow bags and harvested throughout the winter.

Tips for Successful Lettuce Planting in Grow Bags

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

  • Soil Preparation: Use a high-quality potting mix that provides good drainage. Lettuce prefers well-draining, loose soil. Enhance drainage by adding sand or perlite to your potting mix.
  • Proper Watering: Maintain consistent moisture in the grow bags, but avoid waterlogging. Lettuce requires even moisture for healthy leaf development.
  • Spacing: Sow lettuce seeds with appropriate spacing. Loose-leaf varieties can be planted closer together, while head varieties need more space.
  • Mulching: Adding 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 lettuce plants in grow bags for signs of pests or diseases. Common lettuce pests include aphids and slugs. Ensure proper garden hygiene and use organic pest control methods when needed.
  • Companion Planting: Lettuce benefits from companion planting. Planting lettuce alongside herbs like dill or chives can help deter pests and improve overall garden health.
  • Protection from Cold (Fall): In late summer or early fall, cover your lettuce plants in grow bags with row covers to shield them from the cold and frost. This allows you to continue harvesting well into the fall or early winter.

Harvesting and Storing Lettuce

Lettuce leaves are typically ready for harvest in about 45 to 60 days from planting. Here’s how to harvest and store your homegrown lettuce:

  • Harvest: Gently cut or pinch off the outer leaves, starting with the largest ones, while allowing the inner leaves to continue growing. This approach allows you to enjoy multiple harvests from the same plant.
  • Cleaning: Wash the harvested lettuce leaves thoroughly to remove any soil or debris. Dry them using a salad spinner or by gently patting them with a clean kitchen towel.
  • Storage: Store lettuce in a plastic bag or container in the refrigerator. Keep it dry and crisp by placing a paper towel in the bag or container to absorb excess moisture. Use the lettuce within a week or two for the freshest taste.


Cultivating lettuce in Minnesota can be a 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 harnessing the benefits of grow bags, gardeners can enjoy a continuous supply of this fresh and versatile leafy green. Whether you’re craving an early spring salad or looking to extend your lettuce harvest into the fall and winter, grow bags provide a practical solution for growing delicious homegrown lettuce in the Land of 10,000 Lakes.