Crystal Apple Cucumber 10 Seeds Grow Zones: 4,5,6,7,8,9,10,11,12 Save the seeds from these heirloom cucumbers as they are rare and almost extinct. The skin is so thin that you don't have to peel these cucumbers. Germination instructions: Sow seeds 1 inch deep into the soil surface. Keep seeds and soil moist during the germination phase. Germination time takes up to 13 days. Once germinated, if not already in their permanent spot, quickly transfer them to their final spot as, cucumber vine roots are tender and will easily rip apart during a transplant. Likewise, take care not to put a trellis into a cucumber pot late in the game either because the trellis stakes can rip the tender roots and thus kill the plants as well. Ensuring the soil is well tilled and loose will make for a rewarding upper-body growth.