How to grow cucumber
Family Cucurbitaceae. Hardy to USDA hardiness zone 4a+ (U.S. Department of Agriculture). Full sun. Ready in 50-70 days.
Sun
Full sun
Spacing
12 in (trellis)
Days to harvest
50-70 days
Hardiness
Zone 4a+
What growers actually recorded
Loading zone 7b results…
When to plant cucumber
- Start indoors: ~3 weeks before last frost.
- Transplant out: ~2 weeks after last frost.
- Direct sow: ~1 weeks after last frost.
Companion plants for cucumber
Plant with: Bean, Corn, Radish, Dill.
Avoid near: Sage, Melons (share pests).
Common pests & problems
Cucumber beetle, squash bug. Row cover until flowering.
Feeding & fertilizer
N-P-K ratio: Balanced 5-5-5, ease off N at flowering
Organic options: Compost + aged manure in the hill · Fish emulsion until first blossom · Kelp meal + wood ash at flowering
When to feed: Big feed at transplant, side-dress once vines run, potassium boost at flowering.
Watch for: Female flowers dropping = pollination issue, not fertilizer.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
Trellis vertically to double yield in the same footprint and cut mildew.
When to plant cucumber in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for cucumber
Soil & pH
6.0-6.8
Warm, well-drained soil enriched with compost. Cool wet soil = damping-off in seedlings.
Build a low mound (hill) 12-18 in wide, mix in a shovel of compost per hill. Wait until soil hits 65°F to plant.
Watering
1.5-2 in / week: cucurbits are 90% water
Drip at the base. Never wet the leaves: powdery mildew loves damp foliage.
Morning leaf droop is normal; afternoon droop that hasn't recovered by sunset means water now. Dull, slightly blue-green leaves are the first sign before wilt even shows.
Knowing when to harvest
- Slicers: 6-8 in and dark green.
- Picklers: 3-5 in and firm.
- Pick every 2-3 days: one overripe fruit signals the vine to stop producing.
Storing & keeping
Crisper, 45-50°F for 1 week. Cucumbers pit below 45°F. Do not wash until use.
What to expect
Per plant: 8-15 lb trellised slicer; 20+ small picklers
Troubleshooting cucumber
Bitter fruit
Likely cause: Heat stress or uneven water
What to do: Consistent water + mulch; harvest young; choose burpless varieties.
Fruit misshapen or curled
Likely cause: Poor pollination
What to do: Plant flowers to attract bees; hand-pollinate at dawn (male → female flower).
Varieties worth growing
Marketmore 76 (slicer)
Disease-resistant workhorse.
Boston Pickling
Heirloom pickler that holds crunch.
Suyo Long (burpless)
Thin-skinned, mild, heat-tolerant.
Growing cucumber in containers
5-gallon minimum + trellis. Bush cucumbers (Bush Champion, Spacemaster) work best in pots.
Nutrition
Beta-carotene (winter squash), silica, vitamin K, hydration mineral profile.
Common questions
Why do the first flowers not set fruit?
Cucurbits open all-male flowers first for 1-2 weeks. Females (with a tiny cucumber behind the flower) come next.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.