Growing cucumbers in home gardens (2024)

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Quick facts

  • Cucumbers grow best in warm weather.
  • Start seeds indoors in late April for transplants.
  • Sow seed directly in the garden after soil has warmed, usually in May.
  • Plastic mulch and row covers allow earlier planting.

A summer vine crop

Cucumbers (Cucumis sativus) are common garden vegetables in all regions of Minnesota. You can eat them pickled, or raw in salads.

Like other vine cropssuch as squash, melons and pumpkins, cucumbers grow best in warm weather. Some varieties form long vines that may need a trellis. Others are bush-types that fit better in a small garden.

Soil pH and fertility

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  • Have your soil tested.

  • For best yield and quality, the soil pH should be between 6.0 and 6.5, which is slightly acidic.

  • The soil should be moisture retentive yet well drained.

  • Forming raised beds will ensure good drainage, which these crops need.

  • Improve your soil by adding well-rotted manure or compost in spring or fall. Do not use fresh manure as it may contain harmful bacteria and may increase weed problems.

  • Do not use “Weed and Feed” type fertilizers on vegetables. They contain weed killers that will kill vegetable plants.

Selecting plants

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Cucumber plants have separate male and female flowers on the same plant. Male flowers usually appear first, each attached to the plant by a slender pedicel, or stem. Female flowers grow close to the main vine. Between the flower and the vine is a small round ovary, the unfertilized fruit.

An insect must move the pollen from the male flowers to the female flowers. Bees are common cucumber pollinators. Some newer varieties of cucumber will set fruit that develops normally, even if there is no pollination of the female flowers. These fruits will be seedless or nearly so.

Other varieties have only female flowers, each of which can produce a fruit. These varieties can have high yields. You must grow the all-female varieties with another cucumber variety having traditional flowering habit to provide pollen.

  • If you have previously identified disease issues in the garden, choosing a resistant or tolerant variety is a good way of preventing the disease in the future.
  • A resistant variety will not become diseased.
  • A tolerant variety will become diseased, but the spread of disease will be slower and the infection will be less serious
  • Seed catalogs use codes to note which varieties of cucumbers are resistant or tolerant to different diseases.
  • Some garden centers and big box stores include this information in their signage.

Planting

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The best way to start cucumbers is direct seeding. Use a soil thermometer and sow seeds after the last frost date, once the soil is at least 70° F at the one-inch depth. In most of Minnesota, this will be sometime in late May.

Earlier planting is possible with the use of black plastic mulch, which raises soil temperature. Apply black plastic mulch to the soil once you prepare it in the spring. Cut holes or slits in the mulch, and plant the seeds.

Sow seeds about one-half inch deep. For vining types that will spread out in the garden, sow seeds two inches apart. Allow about two or three feet of space on either side of the row for the vines to spread.

A "hill" of three or four seeds sown close together is another way to plant cucumbers in the garden. Allow five to six feet between hills. You can plant bush types, with very short vines, in closely spaced rows or hills, with only two to three feet between rows or hills.

After emergence, thin seedlings to stand 8 to 12 inches apart. You may also train the vines to climb a three- to four-foot trellis, allowing you to space garden rows more closely, and producing perfectly straight fruit.

After the seedlings have emerged, position the row covers over the plants, securing the edges with soil or staples. Spun row covers raise air temperature around the plants and protect them from cold nights. Row covers prevent both pests and beneficial insects needed for pollination from the plants, so you must remove them from the plants once flowering begins, unless the variety is seedless.

  • Cucumber seeds will not germinate in cold soil. Plants started indoors and set out into cold soil will also not grow very well.

    Growing cucumbers in home gardens (2)

  • Since the plants cannot survive freezing temperatures, plan to set the plants out after the last frost date.
  • Start seeds indoors no earlier than four weeks before the last frost date.
  • Start the seeds in peat pots that you can plant directly into the soil.
  • Before the plant begins to outgrow its container, transplant it carefully. Do not damage the cucumber’s taproot.

How to keep your cucumber plants healthy and productive

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  • Long taproots and branching surface roots help cucumber plants reach soil moisture even in dry weather.
  • Vine crops are heavy water feeders, so you should constantly check soil moisture.
  • Cucumbers need about one inch of water from rainfall or irrigation each week during the growing season.
  • Always soak the soil thoroughly when watering.
  • Water sandy soils more often, but with lower amounts applied at any one time.
  • Water the plants with drip hose, soaker hose or a careful watering of the soil, so that the leaves stay dry. Do not use a sprinkler or spray the plants with a hose.
  • Trellised plants growing vertically may require watering more often.
  • Frequent, shallow cultivation with a hoe or hand tool will kill weeds before they become a problem.
  • The roots of vine crops are close to the surface of the soil, so it is important not to cultivate too deeply or too close to the plants.
  • Scratch the soil surface with a hoe just deeply enough to cut the weeds off below the surface of the soil.
  • Continue cultivating as long as you can do so without injuring the plants, usually when the vines begin to spread between the rows.
  • When cultivation is no longer possible, pull large weeds by hand.
  • If you use mulch such as straw or compost to help control weeds, do not apply it until the soil is above75°F. These mulches can slow soil warming.

For assistance in diagnosing unknown problems, visit the University of Minnesota Extension diagnostic site “What’s wrong with my plant?

Poor fruit set could e due to not enough pollination. Cold, rain or cloudy weather can reduce pollination.

Bitterness in cucumbers is sometimes a problem. Typically, fruits are bitterer closer to the skin, and bitterest at the blossom end. Concentrations of the bitter compound, cucurbitacin, vary among varieties. There are some non-bitter varieties available to home gardeners. Bitter varieties are more attractive to cucumber beetles, so planting non-bitter varieties has the benefit of less pests.

The first blossoms often drop from the vines. This is not a problem, since the first flowers to appear on the vines are male. The female flowers, which open later, have a swelling at the base that forms the fruit, also known as the ovary. After bees pollinate these female flowers, the fruit develops.

Harvest

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  • Pick cucumbers when they reach the size you prefer. For pickles, try to harvest at a uniform size.
  • Pickling cucumbers often have very good flavor for salads as well.
  • Harvest slicers or salad cucumbers at any size before they are over-large, with large seeds and yellowish skins.
  • If you leave very large cucumbers on the vine, plant yield will decline.
  • Harvest often, but be careful not to disturb the vine, as they often send out new roots from joints in the vine. Disturbing the vine can break these roots.
  • Do not pick fruit when the vines are wet, because of the danger of spreading diseases.

Storage

  • Good storage conditions for cucumbers, humid and 55°F, do not exist in most kitchens.
  • A cool basement might work as a place to hold cucumbers in perforated plastic bags.
  • Cucumbers will keep for about a week in the refrigerator.
  • The time-honored way to preserve cucumbers is by pickling.

Managing pests, diseases, and disorders

Many things can affect cucumber plants. Changes in physical appearance and plant health can be caused by the environment, plant diseases, insects and wildlife. In order to address what you’re seeing, it is important to make a correct diagnosis.

You can find additional help identifying common pest problems by using the online diagnostic tools What insect is this? and What's wrong with my plant? or by sending a sample to the UMN Plant Disease Diagnostic Clinic. You can use Ask a Master Gardener to share pictures and get input.

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  • Striped cucumber beetles damage plants by eating leaves as well as flowers, stems, and fruit. They may also help cause bacterial wilt.
  • Spotted cucumber beetles migrate to Minnesota every year, and once here they feed on all above-ground parts of the plant.
  • During periods of hot, dry weather, spider mites can feed on leaves, giving them a bleached or bronzed appearance.

Many of the same cultural practices help prevent a wide variety of cucumber diseases.

  • If plants suddenly wilt, bacterial wilt could be the cause.
  • Powdery mildew is a fungal disease that causes powdery white spots to form on leaves and vines.
  • If new growth on the plant is off-color, twisted, or distorted, it could be a cucurbit virus.
  • Anthracnose can cause large, tan spots on leaves.
  • Angular leaf spot causes small, blocky spots on leaves, which are surrounded by a yellow halo.
  • The first blossoms often drop from the vines. This is not a problem, since the first flowers to appear on the vines are male. The female flowers, which open later, have a swelling at the base that forms the fruit, also known as the ovary. After bees pollinate these female flowers, the fruit develops.
  • Poor fruit set could be due to not enough pollination. Cold, rainy, or cloudy weather can reduce pollination.
  • Bitterness in cucumbers is sometimes a problem. Typically, fruits are bitterer closer to the skin, and bitterest at the blossom end. Concentrations of the bitter compound, cucurbitacin, vary among varieties. There are some non-bitter varieties available to home gardeners. Bitter varieties are more attractive to cucumber beetles, so planting non-bitter varieties has the benefit of fewer pests.

Authors: Marissa Schuh, Extension educator, Vincent J. Fritz and Carl J. Rosen

Reviewed in 2022

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Growing cucumbers in home gardens (2024)

FAQs

Growing cucumbers in home gardens? ›

Space cucumbers 36 to 60 inches apart (12 inches apart for trellised plants) in an area with abundant sun and fertile, well-drained soil with a pH of 6.0 to 6.8. Improve native soil by mixing in several inches of aged compost or other rich organic matter. Cucumbers will grow quickly with little care.

Is it better to grow cucumbers on a trellis or on the ground? ›

Even in large gardens where cucumbers have room to spread out along the ground, growing cucumbers on a trellis provides many benefits. Trellis-grown vines produce higher yields than those on the ground, and by growing upward instead of outward, you can produce significantly more fruit per square foot.

Do cucumbers need a lot of room to grow? ›

Allow about two or three feet of space on either side of the row for the vines to spread. A "hill" of three or four seeds sown close together is another way to plant cucumbers in the garden. Allow five to six feet between hills.

Do cucumber plants need full sun? ›

Cucumber plants like sun, but are prone to scorching, so some shade is preferable. Encourage greenhouse varieties to climb to boost yields. Harvest fruits early in the day while it's cool. Harvest frequently to get more fruits during the season.

Do cucumbers grow better inside or outside? ›

Cucumbers are best sown indoors, as they can be started off earlier to get an earlier crop. Germination is also more reliable and young plants are easier to look after until they're more resilient. They should be moved to their final growing position after about a month.

Why do you hill cucumbers? ›

Make a hill before planting the cucumber. Just a small rise in the ground is adequate. Build the hill, or mound, about a foot in diameter and about three inches high; this is to drain water from around the stem.

How many cucumbers can one plant produce? ›

Cucumber is a warm-season vegetable that yields a high return for the amount of space it occupies. It's not uncommon for one plant to yield 30-40 fruit over a three- to four-week period. The fruit is low in calories, a favorite component in salads and a favorite in pickling.

What happens if you plant cucumbers too close together? ›

Spacing is important as competing cucumber vines can shade one another out if planted too closely. This will prevent the cucumber from growing evenly.

Do cucumbers do well in raised beds? ›

Cucumber is one of the most widely used vegetables in the garden. They can grow vertically, in raised garden beds, containers, and even in your landscape. With a little care and attention, you can enjoy rich cucumbers throughout the summer.

Should I pinch off cucumber flowers? ›

If you allow the male flowers to develop and pollinate the female flowers, the fruits that develop will leave you with a nasty aftertaste as the seeds contain a bitter compound called cucurbitacin. So make it a regular job to remove male flowers and keep your fruits seed-free and sweet.

Should I water cucumber plants every day? ›

Give them full sun and plenty of space to grow, and train them on a trellis or fence. Cucumbers perform best with regular, deep watering once a week or so and with more frequency if the weather is very hot for a period of days. Inadequate or inconsistent moisture can cause oddly shaped or poor-tasting fruit.

What do you plant next to cucumbers? ›

Radishes, beets, carrots, and onions: These root vegetables work well with cucumbers because they do not spread and compete for space; most of their growth occurs beneath the soil.

Do cucumbers like morning or afternoon sun? ›

Cucumbers need lots of sun, at least eight hours a day. Morning sun is best because it dries the dew from the leaves which helps prevents mildew. Always rotate where you grow your cucumbers from year to year to avoid soil borne diseases and overwintering insects.

Should I mist cucumber plants? ›

How to care for cucumbers. In the greenhouse, water cucumber plants regularly and mulch the soil to retain moisture and keep the area around them weed-free. Increase humidity by damping down the greenhouse regularly, or spraying the cucumber plants with a fine mist from your hose.

What is the easiest cucumber to grow? ›

Bush Champion cucumbers are the perfect choice for small gardens outdoors due to their compact plants, rapid growth rate, and resistance to mosaic virus. They produce eight to 11-inch fruit in just 60 days, making them a prolific and reliable producer of crisp, bright green cucumbers.

What is the best way to plant cucumbers? ›

Planting and Spacing

Cucumber should be planted when soils are 65°F or after all frost danger has past. Plant 4-6 seeds every 12-18 inches in rows 4 feet apart. After they have two leaves, thin to 2 plants per location. Transplants should be planted 2 feet apart in row, with rows 4 feet apart.

What is the best way to grow cucumbers? ›

Sow seeds 1 inch deep and about 3 to 5 feet apart in a row, depending on variety (see seed packet for details). For vines trained on a trellis, space seeds or plants 1 foot apart. Cucumbers can also be planted in mounds (or “hills”) that are spaced 1 to 2 feet apart, with 2 to 3 seeds planted in each mound.

What is the best support for cucumber plants? ›

-A trellis provides a solid structure and space for cucumber plants to grow on. Cucumbers produce better-quality fruit with less disease or damage when supported on a sturdy trellis. -A trellis makes the harvesting process a lot easier.

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