How to Grow Cucumbers

Find out from the garden experts at HGTV how to plant, grow and harvest cucumbers .

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March 11, 2020
A cucumber growing on a vine.

Cucumbers Growing on a Vine

Photo by: Shutterstock/Africa Studio

Shutterstock/Africa Studio

Know Your Cucumbers

Pea Vines On Trellis

Expandable Pea Trellis

An expandable, powder-coated steel trellis drops into your pea patch in a matter of seconds and adds a splash of color to boot. It’s best to add pea supports just before planting, so you can place seeds precisely. Once peas break through soil, withhold water slightly (don’t let plants wilt) during the early growing time. This causes the peas to root deeper into soil. Peas tend to be shallow-rooted plants, which makes them more susceptible to drought and heat. Deeper roots help prolong the harvest season, as does a 2- to 4-inch mulch layer over soil around vines. Use a trellis like this to give peas a lift in spring, and when summer comes, draft it for supporting tomatoes, cucumbers or flowering vines.

Photo by: Gardener’s Supply Company/gardeners.com

Gardener’s Supply Company/gardeners.com

Cucumbers (Cucumis sativus) are warm-weather annual vegetables that are easy to grow. As long as you give them consistent water and warmth, they will reward you with plenty of fruit. They are prolific growers that need plenty of room to climb but can be trained to grow in almost any space.

There are two basic types of cucumbers and two different growing habits of cucumber plants. Vining and bush are growing habits while pickling and slicing are types.

Cucumber Growing Habits

Cucumbers may have either a vining or bush growth habit. Vining cucumbers require the support of a trellis or fence in order to grow efficiently. Bush varieties are more compact and better suited for containers or small gardens. They are fast-growing and are perfect for succession planting. Pickling or slicing type fruits may grow on either bush or vining plants.

Types of Cucumbers

Heirloom Vegetable Cucumber

Lemon Cucumber

Introduced in 1894, lemon cucumber is a taste treat worth trying. The yellow skin with green stripes is smooth and not bitter. Flesh has an almost sweet crunch and makes wonderful pickles. Pick fruits just as they’re turning yellow and lemon size for fresh eating, or wait until they reach tennis ball size to use them as a salad bowl.

Photo by: Johnny's Selected Seeds at JohnnySeeds.com

Johnny's Selected Seeds at JohnnySeeds.com

Although there are only two basic types of cucumbers, there are many options within the types. Pickling cucumbers are smaller and stouter, have more spines and drier flesh. These characteristics allow them to soak up more of the brine which makes them a perfect choice for pickling. Slicing cucumbers tend to be larger and longer with thinner skins that are not bitter. They are suited for salads and fresh eating. Seedless cucumbers are slicing cucumbers that bear sweeter tasting fruit with a thinner skin than other slicing types of cucumber. They are often marketed as "burpless."

Specialty and heirloom varieties are gaining in popularity for many home gardeners. The cucumbers tend to have less-developed disease resistance than modern hybrids and are not as prolific. They are generally grown for flavor, color or other unusual characteristics.

Popular Cucumber Cultivars

  • Early yields: ‘Sassy’ or ‘Calypso’
  • Pickling: Boston Pickling and Parisian Pickling (for making gherkins)
  • Seedless: Burpless Bush
  • Heirloom/specialty: Lemon Cucumber

When to Plant Cucumbers

These warm-weather plants should be seeded directed into the garden or transplanted outside no earlier than two weeks after the last frost date. The soil must be 70 degrees Fahrenheit in order for the seeds to germinate. Don't be tempted to plant outdoors too soon. Cucumbers are susceptible to cold damage. Be sure the danger of frost has passed before you plant. If you live in a cool climate help warm the soil by covering the hill or row with black plastic for a few days before planting.

You can get a head start by sowing cucumber seeds indoors about three weeks before transplanting them in the ground. They germinate easily, especially when provided with bottom heat. Use a heat mat or lay the seeds flat on top of the refrigerator to help them develop robust roots.

Preparing a Planting Site

Cucumber Plant on Trellis

Cucumber Plant on Trellis

Cucumbers do best if grown on a trellis. By providing a structure you will get cucumbers that are more uniform in size and shape.

Photo by: Shutterstock/Anna Hoychuk

Shutterstock/Anna Hoychuk

Cucumbers need full sun (at least six to 10 hours each day) and warmth to succeed. They also prefer fertile, well-drained soil with a neutral or slightly alkaline pH and plenty of organic matter.

Make sure that the soil is moist but not soggy. Cucumber vines don't like wet, compacted soil. Saturated soil could result in the development of root rot. If your soil is not fertile, you can improve it prior to planting by mixing in compost or aged manure. Work the organic matter into the soil 6" to 8" deep to make fertile soil.

How to Plant Cucumbers

The exact planting depth and spacing will depend on the variety. Refer to the seed packet or plant tag for details. In general, plant two to three seeds at least 1 inch deep and between 12" and 3' apart in a row.

Be sure to consider the size of the trellis the vines will climb on. In most cases, using a trellis means that you can reduce the spacing to 1' to 2' apart. When seedlings reach 4 inches in height, thin plants so that they are at least one-and-a-half feet apart. Apply fertilizer at planting, again one week after bloom, and then every three weeks, directly to the soil around the plants.

Another popular way to plant cucumbers is in mounds or hills. The mounds are spaced 1' to 2' apart with two to three seeds planted in each mound. The plants are thinned to one plant per mound once they reach about 4 inches in height. Cover freshly planted cucumber seeds with netting or row covers to help prevent pests from digging out the seeds. Once the seeds have germinated, mulch with compost to help keep pests, disease and weeds at bay and the soil moist.

Growing Cucumbers

Trellising is a preferred method when growing cucumbers. Both vine and bush habits need support. By training the vines to climb, it not only saves you space, but it also protects the fruit from damage from lying on the moist ground. Without some sort of support, cucumbers will spread all over your garden. Training them to grow on a trellis or onto a tomato cage will help keep the vines in check and your fruit clean. Set up the trellises and start training the vines early to avoid damage to the plant.

A cucumber plant leaf with powdery mildew all over it.

Cucumber Plant Leaf with Powdery Mildew

Photo by: Shutterstock/AJ Cespedes

Shutterstock/AJ Cespedes

Consistent watering is the most important element when it comes to growing cucumbers. They need at least 1 inch of water per week (or more, if it's hot). Inconsistent watering leads to bitter-tasting fruit.

Water slowly in the morning or early afternoon at the base of the plant to help keep the foliage dry. Wet foliage can encourage leaf diseases. If possible, water your cucumbers with a soaker hose or drip irrigation for best results. Water frequently when seedling emerge and increase watering once the plant sets fruit. During this phase, you can side-dress your plants with compost or well-rotted manure. Apply fertilizer at planting, one week after bloom, and every three weeks, directly to the soil around the plants.

Common Pests, Diseases and Problems

Although cucumbers are easy to grow, there are some pests, problems and diseases to consider.

No or little fruit:

If the cucumber plants do not set fruit there is probably a pollination issue. Cucumber plants set both female and male flowers. The male flowers set first and the female flowers appear later at the base. In order to set fruit, they must be blooming at the same time. This may not happen early in the plant's life, but give it time. If pollinators lack due to weather or insecticides, you can hand-pollinate by dipping a Q-tip into the male pollen and transferring it to the center of the female flower.

Pests:

Throughout the growing season, be on the lookout for pests that love to eat cucumber plants. Cucumber beetles, squash bugs and aphids can quickly kill off your harvest. Inspect the plants often. If you see any pests, treat the plant with a natural organic pesticide to control the outbreak.

Disease:

Photo by: Shutterstock/21MARCH

Shutterstock/21MARCH

Powdery mildew is a common disease for cucumber plants. It can develop when the leaves get wet (water at the soil level). It looks like a white powdery substance on the leaves of the plant. It starts off as a few spots here and there, and can quickly spread.

The best way to avoid the disease is to keep the leaves as dry as possible by watering the plant at the base and keeping weeds down to encourage proper airflow. If you do see any signs of the mildew, apply fungicides at the first sign of its presence to prevent spread.

Harvesting and Storing Cucumbers

When the plant bears fruit don't let them get too large before you harvest. Larger cucumbers taste bitter and will have tough skins and hard seeds. During peak harvest time, harvest cucumbers every couple of days. Keep picking regularly to encourage the plant to keep setting fruit.

In general, harvest regular slicing cucumbers between 6" and 8" long and pickling cucumbers at around 2 inches long. A good quality cucumber will be uniform in color, firm and crisp. To harvest, use a clean, sharp knife or pruners and cut the stem above the fruit. Do not pull the fruit — doing so will damage the vine.

Cucumbers consist mostly of water and have a short shelf life once picked. Once harvested, store in the refrigerator crisper drawer wrapped tightly in plastic wrap to retain moisture. They will keep for a week to 10 days when stored properly.

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