Cucumbers in containers

The key to success: use a trellis

Cucumbers just harvested
Cucumbers growing in large planters

Massachusetts gardener Phil Wood grows cucumbers in a Tomato Success Kit. "I've grown cukes in the past, but I could never seem to water them enough. They would dry up and die," says Phil. With the self-watering reservoir, he's succeeded.

By Sophia Bielenberg

ALTHOUGH cucumbers have sprawling vines, you can grow them in containers. The key is to choose a compact variety and train those vines up a trellis. The crop climbs high, conserving space and harvesting is a breeze. In addition, growing in containers is a great way to give cucumbers the extra heat they love and control moisture and fertility.

Getting Started

Cucumbers are members of the cucurbitaceae family, which includes summer squash, winter squash, gourds and melons. Like their relatives, cucumbers are heavy feeders—they require warmth, fertile soil and consistent moisture. In sunny, windy or hot urban areas, plants in containers tend to dry out quickly, but there are simple ways to keep your plants from getting thirsty:

Grow bag with trellis

The Gardener's Best Tomato Grow Bag Set is a great solution with an integrated, adjustable trellis. It's nice for urban gardeners because the porous material "air prunes" the roots, preventing the plant from becoming root-bound. The bag also avoids heat build-up in the soil, and folds flat when you're not using it. The key to success is careful watering. The porous bags can dry out quickly, so it's important to water thoroughly. During hot spells, you might have to water every morning.

Use a large container. A good rule of thumb is to use 3 gallons (or 12 quarts) of soil for each plant. Self-watering planters are especially good for cucumbers because they provide some insurance against drying out. Because of the built-in reservoir, self-watering planters don't dry out as quickly. You'll still need to monitor the moisture level, but you'll have more time between waterings.

Use good quality potting soil. Rich, healthy soil will keep your plants well-fed and retains more moisture than poor quality soil. Do not use ordinary garden soil, which does not drain well when used in a container.

Choose a compact variety. Read the seed packets to identify the best choices for small-space gardening. Several varieties are listed below.

Don't plant too early. Cukes are hot-weather plants. Don't plant outdoors until weather is warm – usually a week or two after the last spring frost. To get a jump-start, you can start seeds indoors a couple weeks before putting them outside. Use biodegradable pots to prevent transplant shock. Pop up covers can also help extend the season.

Use a trellis. Take advantage of the vining habit of cucumbers and make use of vertical space . Even a tomato cage can serve as a trellis.

Feed your plants regularly. Amend the soil with granular fertilizer at planting time and follow up with liquid fertilizer during the growing season.

Check the soil moisture every morning. The best way to keep container plants healthy? Develop a good watering sense. Always check the soil moisture with your finger before watering. If dry, water thoroughly. If wet, don't water again until the soil feels dry on top and remains slightly moist below the surface. Note: Plants use the most water during the day, when they're actively photosynthesizing and transpiring (releasing water from their foliage), so water in the morning, unless it's going to rain.

Pests and diseases

Cucumbers are easy to grow and generally don't have many problems—but there are a few things to watch for:

Spray to prevent garden diseases

Serenade® Garden Disease Control helps prevent powdery mildew when conditions that foster the disease are present. It contains Bacillus subtilis, a soil-dwelling bacterium that is so safe you can spray and harvest on the same day. The key is to use it preventively — before you see signs of a problem.

Powdery mildew looks like white powder sprinkled on the leaf surfaces. It usually happens when conditions are humid and when the plants are stressed; providing good air circulation helps prevent it. If you spot the disease, remove any severely-affected leaves and try either of these two homemade solutions:

  • Mix 1 teaspoon baking soda with 1 drop of dish soap and 1 quart of water and spray on the plants—it raises the pH of leaf surfaces, making them less attractive to spores.
  • Mix 1 part cow's milk with 9 parts water and use the mixture as a foliar spray after each rain. The enzymes in the milk are said to discourage the fungus.

Cucumber beetles and squash bugs are the most common pests of cucurbits. The yellow and black cucumber beetles have big appetites and move quickly — but you can spray them with insecticidal soap (or vacuum them) and destroy the orange eggs they lay on the underside of leaves. Squash bugs are large, brown shield-shaped bugs, but they're quite slow-moving, making them easy to pick off and drop into a container of soapy water. Managing these pests also helps prevent diseases, because insects are often carriers of disease. TIP: If cucumber beetles or squash bugs are a problem from year to year, start the season with fresh soil and cover new seedlings with garden fabric or covers until they start to flower.

If you notice that the first group of flowers that appears simply drops off and doesn't produce fruit, be patient—the first flowers of the season are often males. Female flowers (which have a slight bulge at their base) will start to appear soon after.

Best varieties for containers

In urban areas where there are few bees, choose varieties that are parthenocarpic, which means they set fruit without pollination. Seeds for these varieties are available from High Mowing Organic Seeds.

Poona Kheera cucumber

Poona Kheera. Photo: High Mowing Seeds

Picolino F1: A European slicer with sweet flavor, thin skin and crispy texture. Parthenocarpic, with fruit maturing in 50 days.

Saber F1: An American slicer with 8"-9" fruit that matures in 55 days. No pollination required.

H-19 Little Leaf: No pollination required for this pickling variety, which produces 3"-4" fruit in about 58 days.

Paraiso F1: A slicer with 8"-10" fruit. High-yielding at 59 days.

National Pickling: The 5" fruits, with blunt ends, are perfect for pickling. Starts fruiting at 52 days. Also delicious in salads.

Poona Kheera: Unusual variety from India has 4"5" fruit with golden skin and a juicy, crisp texture. Very productive, starting at 50 days. Climbs easily on a trellis to 5 or 6 feet.

Sophia Bielenberg

Sophia Bielenberg is an avid gardener and has worked at organic farms and nurseries for over a decade. She currently works as a writer, producing content for the blog and catalog at High Mowing Organic Seeds in northern Vermont. She is passionate about plants and traveling, and especially likes to grow kale, tomatoes, succulents, and potted citrus.

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