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Cucumbers are seeded or transplanted outdoors not earlier than 2 weeks after the last frost date.For an early crop, sow cucumber seeds indoors, approximately 3 weeks before you transplant them.Improve clay soil by adding organic matter. Make certain that soil is moist and well-drained, not waterlogged.Mix in compost and/or aged manure before planting to a depth of 2 inches and work into the soil 6 to 8 inches deep. Sow seeds in rows, 1 inch deep and 6 to 10 inches asunder.If you are transplanting seedlings, plant them 12 inches apart. A trellis might be a safe idea if you want the vine to climb, or if you have limited space.