Japanese Climbing

Cucumber

55d to harvest

Crisp and cool from the first bite, Japanese Climbing cucumber delivers a clean, bright flavor with a delicately sweet snap and a glossy, tender skin. The long, straight fruits develop on a vigorous climbing habit, making them ideal for trellised gardens where you can harvest slender spears at their peak. Grow Japanese Climbing for fresh slicing, vibrant pickles, and silky, garden-fresh sauces that showcase its refined crunch.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 15th
Transplant / Sow Outdoors	May 29th
Harvest Begins	Jul 23rd
Harvest Ends	Sep 1st

Crop Details

Trait	Value
Days to Maturity	55
Sun Requirements	Full Sun
Growth Habit	Vine
Support Needed	Trellis
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	65
Min Night Temp (°F)	55
Harden Off (days)	12

Frequently Asked Questions

Why are my cucumber (Cucumis sativus) vines getting powdery mildew and how can I stop it early?

Powdery mildew on cucumbers shows up as a white, powdery coating on leaves in warm, humid spells, often starting mid-season. Cut off the first visibly affected leaves and improve airflow by spacing plants and training vines upward. Spray a labeled potassium bicarbonate or sulfur fungicide early in the first signs of powdery growth, and repeat as directed on the label.

How often should I water Japanese climbing cucumbers during peak growth, and what soil moisture level do they need?

During peak flowering and fruiting (around mid-growth to maturity), keep the soil consistently evenly moist, not waterlogged—aim for about 1 inch (2.5 cm) of water per week total, more if you have hot, windy weather. Water at the base early in the day so the leaves stay dry, and use mulch to prevent the soil from swinging between dry and soggy. If leaves wilt midday, check soil 1–2 inches down; if it’s dry at that depth, water thoroughly.

When are Japanese climbing cucumbers (Cucumis sativus) ready to harvest?

Harvest when fruits are firm and their skin is fully developed but still tender, typically about 55 days from sowing. For best eating quality, pick frequently—once they reach the expected cucumber size for your planting, harvest every 1–2 days. Overripe cucumbers become dull, softer, and can slow further production.