Cucumbers are a favorite in home gardens, appreciated for their crunchy texture, fresh color and mild flavor that pairs well with many dishes. Whether blended into creamy salads, pickled for a tangy snack, or made into a refreshing cold soup, cucumbers add a simple and versatile touch to meals.
About cucumbers
Cucumbers are tender, warm-season vegetables that produce well with proper care. They belong to the Cucurbitaceae family, along with squash, pumpkins, muskmelons and gourds.
Varieties
Cucumbers range in size from tiny gherkins (less than 1 inch long) to large, cylindrical or serpent-like fruits (20 inches or more). Quality cucumbers are usually green but can also be white or yellow. Over-mature cucumbers often turn yellow, orange or white. Cucumber varieties are typically recommended based on the intended end-use:
- Pickling: Blitz, Fancypack, Pioneer, Calypso, Muncher, Cross Country, SMR 58, Bush Pickle, County Fair, Clinton, Cool Breeze, Regal
- Slicing: Marketmore 80, Dasher II, Slicemaster, Spring 440, Burpee Hybrid, Poinsett, Raider, Intimidator, Tasty Green, Greensleeves, Orient Express, Amira, Genuine, Slicemore, Ultrapak, Tasty Jade
- Novelty: Armenian, Lemon, Snake, African Horned
Cucumber varieties vary in their days to maturity, with early-maturing varieties requiring as little as 50 days at relatively high temperatures (75 to 85°F) to reach harvest, while late-maturing varieties may take up to 70 days.
Growing considerations
Most cucumber varieties require significant space to grow. Small-space gardeners have the following options:
- Vertical growing: Grow vines vertically against a trellis or fence. Ensure the support structure is sturdy enough to handle the weight of mature cucumbers.
- Bush varieties: Plant dwarf hybrids which require less space e.g. Bush Champion.
- Container growing: Use large hanging baskets or other containers for compact growth.
Flowering and pollination
Contrary to popular belief, cucumbers do not cross-pollinate with other members of the vine crop family.
All standard open-pollinated varieties, as well as some hybrid varieties, are monoecious, meaning they produce both male and female flowers on the same plant.
- Male flowers: Male flowers typically appear first and provide pollen, which is transferred to female flowers by pollinators like bees and other insects.
- Female flowers: Female flowers develop with a small ovary at the base, resembling a tiny cucumber, which, when pollinated, will develop into a mature fruit.
Factors affecting pollination and yield:
- Temperatures below 10°C (50°F): Can reduce bee activity, impacting pollination.
- Rainy weather: Hinders pollination efficiency.
- Insecticides: Improper use can kill bees, leading to decreased pollination rates.
Seedbed preparation
Cucumbers adapt to most soils but grow best in fertile soil with plenty of compost.
- Start seedbed preparation: When the soil has enough moisture to form a ball that crumbles into medium-sized fragments.
- Plow or rototill: Incorporate crop residues and organic matter into the top 7–8 inches of soil. Destroy weed growth and prepare a fine, granular bed for transplanting.
- Avoid overworking soil: To prevent soil from becoming powdery and crusting.
- Soil pH: The ideal pH for cucumber growth is between 6.0 and 6.8.
Planting
Start cucumbers by planting seeds directly into the garden after the danger of frost has passed. Ensure the soil temperature is at least 65°F for optimal germination.
- Earlier crop: Start seeds indoors about 2-3 weeks before transplanting.
- Purchasing transplants: Choose healthy, vigorous transplants with bright green leaves, strong stems and no signs of yellowing, wilting or pests. Avoid leggy or root-bound plants.
- Spacing: Space transplants 12–24 inches apart within rows that are spaced 48–72 inches apart.
- Protect from frost: Cucumbers thrive in warm soil, and using plastic mulches, row covers, or tunnels is common.
Direct seeding specifications
- Hill formation: Form low, broad hills about 8–10 inches high.
- Spacing: Space hills 4–5 feet apart with 4 feet between rows.
- Seeding: Plant 4–6 seeds per hill at a depth of 1 inch.
- Thinning: When plants reach about 5 inches tall, thin them to 12 inches apart.
Plant maintenance
If seeds fail to germinate or germinate unevenly, investigate the cause to prevent recurrence. Common issues include seeds planted too deeply, cold soil, old seed (5 years or older), or pest damage. Familiarize yourself with the appearance of healthy plants and periodically observe them for signs of stress or pests, ideally two to three times per week.
Fertilization
- Soil testing: Adjust fertilizer rates based on a soil test report from a testing laboratory.
- Pre-plant fertilizer: Apply one pound of a pre-plant fertilizer (e.g., 10-10-10) per 100 square feet.
- Side-dress: One week after flowering begins, side-dress with 1.5 oz of ammonium sulfate per 10 feet of row.
- Signs of nutrient deficiency and toxicity: Watch for stunted plants with pale leaves, indicating low fertility, or vigorous plants that fail to bloom or set fruit, indicating excessive fertility.
Watering
Cucumbers typically have a rooting depth of 36–48 inches and require frequent watering.
- Soil moisture: Should not drop below 65% of its total water-holding capacity (WHC). In clay-loam soils, this can be judged by forming a firm ball with the soil, which should feel moist but not sticky and should be pliable. When broken, it should crumble into medium-sized fragments.
- Signs of stress: The most common sign of stress is leaf wilting, associated with under- or over-watering. Drought-stressed plants are susceptible to spider mites.
Weed control
Cultivation should be shallow to remove competing plants without damaging the root system.
- Deep cultivation: Close to the plants can destroy roots and reduce yield and quality. If necessary, penetrate the soil no deeper than 1 inch.
- Black plastic ground mulch: Highly recommended for weed control and soil warming.
Diseases and pests
Cucumber diseases include damping-off (caused by Pythium ultimum), curly top, powdery mildew and cucumber mosaic virus. Pests include aphids, cucumber beetles, cabbage loopers, thrips, slugs, spider mites, garden symphylans and wireworms. Avoid planting cucumbers in the same location for consecutive years. Cucumbers, along with other members of the Cucurbitaceae family, are susceptible to similar pests and diseases. To minimize these risks, rotate cucumbers on a three-year schedule. Instead, grow non-cucurbit vegetables in between rotations.
Disease management
- Avoid overhead watering: To prevent water from splashing onto foliage.
- Remove and discard: Destroy infested material (do not compost).
- Disease resistance: Avoid planting susceptible plants in infected areas or plant disease-resistant cucumber varieties.
Pest management
Healthy vines can tolerate some pest damage, but vines that are already stressed from drought or other causes may attract pests.
- Scouting for pests: Regularly scout cucumber plants for pest presence or signs of damage (leaf discoloration, insect feeding damage, vine tip dieback, surface marking on fruit) to anticipate and control pests before they jeopardize plant health or fruit quality.
- Beneficial insects: Recognize and encourage beneficial predators in your landscape. Avoid broad-spectrum insecticides that kill beneficial predators.
- Soft-bodied pests: Use insecticidal soaps for aphids.
Visit Solve Pest Problems for more information on pest management.
Harvesting
Harvest cucumbers any time after they reach the desired size but before they turn yellow, and the seeds harden. Bitterness in cucumbers is a temporary issue caused by plant stress, such as temperatures below 60°F or above 90°F, drought conditions, or poor nutrition. The bitter flavor can be reduced by peeling the cucumber to remove cucurbitacin, a compound in the peel responsible for bitterness. Generally, the bitter taste is masked when cucumbers are pickled. For fresh eating, peel them more deeply, especially near the stem end.
- Small, young cucumbers: Suitable for pickling or fresh consumption; pickling varieties yield the best products.
- Slicing: Fruits should be 6–10 inches long.
- Pickling: Fruits should be 2.5–6 inches long and of the highest quality when dark green, firm, and crisp.
- Frequent picking: Remove old fruit from the vine to allow young fruits to develop. Pick vines every other day to promote continuous production. Frequent picking is essential to encourage new fruit growth.
