• Sowing and planting. Cucumber seeds will germinate in as little as three days when the soil temperature is 80° to 90°F. Sow cucumber seed indoors about three weeks before setting seedlings into the garden. Start cucumbers indoors in individual pots so that the roots are not disturbed at transplanting. Set out cucumber starts when the garden soil temperature is 70°F or greater. You can speed garden soil warming by covering the planting area with black plastic mulch or by using mounds or raised rows to grow cucumbers.
• Spacing. Plant cucumbers in full sun and set bush cucumbers 18 to 24 inches apart and vining varieties at least 24 to 36 inches apart in rows 3 feet apart. Cucumbers like well-drained roots so planting on mounds is a good idea. Set three plants on mounds 3 feet across; space mounds 6 feet apart. Set trellises or pole supports in place before you plant seedlings. To prevent diseases, air circulation around plants is important.
• Protection. Cucumbers do not like chilly weather or chilly soil. They will die back with even a touch of frost. When night temperatures fall below 65°F protect cucumbers with floating row covers.
Can sow indoors 5 weeks before planting, take care not to damage roots, shallow roots also damaged with cultivation. Best grown on trellis and planted where it gets no overhead watering. Sow after frost.