What Size Grow Bag Should You Use for Growing Cucumbers?

For gardeners who want to grow their vegetables in a controlled environment, grow bags are a new and useful idea. These portable containers, typically made from breathable fabric, provide numerous advantages over traditional gardening methods. As a result, they are ideal for small spaces, urban gardens, and even indoor use. This article will talk about the pros and cons of using 5 to 10 gallon grow bags to grow vegetables in your garden. It will also give you advice on how to pick the right size, soil, and watering methods to get a big harvest.

Growing cucumbers in containers is an excellent way to save space and get a bountiful harvest. With the right size grow bag you can easily grow these vining veggies on a balcony, patio or any small space. But what size container is best? Let’s take a look at the ideal grow bag options for cucumbers.

Why Use Grow Bags for Cucumbers?

Traditionally, cucumbers are planted directly in garden beds However, they also perform well when grown in fabric grow bags or rigid plastic containers Here are some of the benefits of using grow bags

  • Save space – cucumbers sprawl and need ample room to grow, Bags keep the vines neat and compact

  • Promote healthy roots – bag fabrics “air prune” roots, preventing spiraling and encouraging branching for optimal growth.

  • Improve drainage – bags allow excess moisture to drain easily from the soil mix. Cucumbers need consistently moist but not soaked soil.

  • Increase yields – the confined space encourages abundant fruit production once female flowers are pollinated.

  • Portability – bags allow you to move plants to follow the sun or protect from frost.

For optimal results, select grow bags made from breathable materials like fiber, felt, or landscape fabric. Avoid cheap plastic bags that can overheat roots.

Choosing the Right Grow Bag Size

When selecting a grow bag, aim for the largest practical size that fits your space. Here are some size guidelines:

  • Minimum size – 3 gallons (10-12 inches wide)

  • Small but productive – 5 gallons (12-14 inches wide)

  • Ideal size – 10-15 gallons (16-18 inches wide)

  • Max for cukes – 20-30 gallons (24 inches wide)

For comparison, in-ground planting recommendations are:

  • Bush types – 4 sq. ft. (~18-24 inches apart)

  • Vining types – 8 sq. ft. (~36-48 inches apart)

So a 10 gallon grow bag provides ample room for one cucumber plant, mimicking ideal in-ground spacing.

You can also plant multiple cucumber plants per larger bag:

  • 10-15 gallon – 2 plants
  • 20 gallon – 3 plants
  • 30 gallon – 4 plants

Just be sure to trellis them vertically to maximize space as they grow.

Other Tips for Productive Grow Bags

To get the most from your cucumber grow bags:

  • Use quality potting mix, not garden soil which compacts too easily. Mix in compost for nutrients.

  • Add bag supporters or hang bags at an angle to promote drainage.

  • Place bags in full sun – cucumbers need at least 6 hours of direct light.

  • Water when the top 1-2 inches of soil become dry. Check bags daily.

  • Install trellises for vertical vine growth to make the most of limited bag space.

  • Pinch off early female flowers to promote vigorous vine growth before fruiting.

  • Mist vines daily and provide wind protection to optimize pollination.

  • Apply a balanced liquid fertilizer every 2-3 weeks during fruiting.

  • Avoid overcrowding bags with too many plants as they mature.

Sample Cucumber Planting Plans

Here are two sample cucumber planting plans using grow bags:

Option 1: Two 10-15 gallon bags

This layout provides:

  • 2 productive plants
  • 5-6 feet of vertical trellising
  • Yields 15-25 full size cucumbers


  1. Set up two 10-15 gallon grow bags on a sunny balcony, spaced 3 feet apart.

  2. Install 5-6 foot trellises next to each bag for vines to climb.

  3. Plant one cucumber seedling per bag. Water well.

  4. Train vines up trellises as they grow. Prune side shoots.

  5. Harvest cucumbers when fruits reach desired size, before yellowing.

Option 2: One 20-30 gallon bag

For maximum yields in one bag:

  • 3-4 productive plants
  • 7-8 feet of vertical trellising
  • Yields 20-30 full size cucumbers


  1. Set up a 20-30 gallon grow bag with 8 foot trellis.

  2. Plant 3-4 cucumber seeds, thinned to best seedlings.

  3. Train vines up trellis, keeping evenly spaced.

  4. Prune heavily to encourage vertical growth.

  5. Harvest promptly, succession planting for continuous yields.

The right size grow bag provides the root space cucumbers need while optimizing your garden space. Focus on 10-15 gallon bags for easiest management, or size up for higher yields. With proper care, container cucumbers can out-produce in-ground plants!

Benefits of Using Grow Bags for Garden Vegetables

Better Root Growth: Grow bags help roots grow healthier by stopping root circling, which happens a lot in regular pots. Air can get into the soil through the fabric’s holes, which helps prune the roots and build a thick, fibrous root system.

Better Drainage and Aeration: Grow bags’ permeable fabric lets water drain away and air flow through, which keeps plants from getting too wet and rotting roots. This creates an optimal environment for your vegetables to grow.

Temperature Control: Grow bags can keep plants safe from extreme temperatures, keeping their roots warm or cold during hot or cold spells. The fabric material helps regulate the temperature of the soil, ensuring a consistent growing environment.

Portability: Grow bags are lightweight and easily transportable, making it simple to move your plants around as needed. This is especially helpful for gardeners who don’t have a lot of room or who need to move their plants around to get the most sunlight.

For some plantings I use the brown ones – these ones actually. 10 Gallons for potatoes

These are my most commonly used bag – good size, hold up well

Nursery Bags for seed starts

Watering and Fertilizing Techniques for Grow Bags

Proper watering and fertilizing practices are crucial for the success of your garden vegetables in grow bags. Here are some tips to ensure your plants receive the appropriate care:

Watering: Grow bags tend to dry out more quickly than traditional pots due to their breathable fabric. Keep an eye on how wet the soil is and water it when the top inch feels dry to the touch. Avoid overwatering, as this can lead to root rot and other issues.

Fertilizing: Because grow bags only hold a small amount of soil, your plants may need extra nutrients during the growing season. Apply a balanced, liquid organic fertilizer every 2-4 weeks, following the manufacturer’s instructions.

7 Tips to Grow Cucumbers in Containers


How many cucumbers can you plant in a 5 gallon grow bag?

Two or three plants will fit in a five-gallon bucket or grow one cucumber in a 10-inch-wide container. Mix soil with equal parts of compost, potting soil, perlite and peat moss.

Do cucumbers grow well in grow bags?

That makes this crunchy crop impractical for gardeners with a limited size vegetable bed. Luckily, growing cucumbers in bags is an excellent way to preserve your ground space and also grow cucumbers.

What are 10 gallon grow bags good for?

Pot Size
Good for
10 Gallon
Will grow any vegetable. Recommended for Tomatoes and squash. Can plant multiple different plants in the same pot.
7 Gallon
Will grow any vegetable, recommended for tomatoes, squash, peppers, and cucumbers. Multiple plants can be grown in the same pot.

Do cucumbers grow well in a grow bag?

One of the most critical factors in growing healthy cucumbers is the size of the grow bag. Cucumbers are vine vegetables that grow in long, cylindrical shapes. Hence, the container size will affect how well cucumbers grow because they need space to spread out and grow their vines. A small grow bag will do if you are growing just a few plants.

What size grow bag do I Need?

I used a 10-gallon grow bag for my cucumbers which has a height of 12 inches and a diameter of 16 inches. Generally speaking, a 5-gallon size bag is the minimum you should use for one plant. But if you plan on growing more than one cucumber plant in the same grow bag, make sure to choose a larger size like a 10-gallon grow bag.

How many gallons should a cucumber grow bag be?

A good size to start with would be around 7 to 10 gallons, but remember that the larger the bag, the larger the plant can grow! I’m using these 10 gallon grow bags for my cucumbers this year. There are plenty of cucumber varieties to choose from.

How deep should a cucumber grow bag be?

Cucumber plants can get big and tall depending on the variety and you want to make sure your cucumbers have adequate room to grow and establish a strong root system. Therefore, you want the depth of the grow bag to be at least 12 inches. I used a 10-gallon grow bag for my cucumbers which has a height of 12 inches and a diameter of 16 inches.

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