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Marketmore is a classic slicing cucumber bred for open-pollinated seed saving and home garden production. It produces smooth, dark green fruits 7–8 inches long with excellent flavour and crisp texture, ideal for fresh eating and salads. Gardeners choose this cultivar for its reliable yields, disease resistance, and the ability to save seeds from mature fruit.

Cucumber seeds germinate best at soil temperatures of 70–90°F; they typically sprout in 3–7 days. Soak seeds in water for 24 hours before planting to speed germination. Seeds prefer darkness; do not expose to light before emergence. Direct-sown seeds will not germinate reliably if soil temperature is below 60°F.

Direct sow seeds 1 inch deep outdoors after all frost risk has passed and soil has warmed to at least 70°F, typically mid-May in zone 7 Maryland. Space seeds 12 inches apart in rows 36–48 inches apart, or plant in hills of 3–4 seeds spaced 18 inches apart. Thin seedlings to 12 inches once true leaves appear. You may also start seeds indoors 3–4 weeks before the last frost and transplant out when soil is warm and plants have 2–3 true leaves; handle transplants gently to avoid disturbing roots.

Keep soil consistently moist but not waterlogged; mulch around plants to retain moisture and regulate soil temperature. Fertilize every 2–3 weeks with a balanced fertilizer or side-dress with compost once vines begin running. Train vines onto trellises or stakes to improve air circulation, reduce disease, and save space; use soft twine to gently tie stems as they grow. Watch for powdery mildew, cucumber beetles, and spider mites; remove affected leaves promptly, spray neem oil for mites, and hand-pick beetles or use row covers on young plants.

Harvest fruits when they are 6–8 inches long and still firm and dark green; do not wait for them to yellow or enlarge, as mature fruit becomes bitter and seedy. Pick every 2–3 days to encourage continued flowering and productivity. Use a knife or pruners to cut fruits from the vine rather than pulling. Store unwashed cucumbers in the crisper drawer at 50–55°F for up to 2 weeks, or use immediately for best crispness. For seed saving, allow one or two fruits to mature fully on the vine until the skin turns yellow; scoop out seeds, ferment them in water for 3 days, rinse well, and dry completely before storing.