Due to the US Postal Service practice of irradiating packages, Hydro-Gardens will not guarantee any seeds sent by the US Mail. This practice will sterilize the seeds and they will not germinate. We will still send your order by US Mail but if they do not germinate, they will not be replaced. These cucumber F1 hybrid varieties are produced in Holland. They should be pruned when grown in a greenhouse. Our technical manual (Item # 9P097) offers tips on their culture and pruning technique. F1 hybrids are produced in a greenhouse. The pollen from one parent is manually transferred to the second parent. The seed from this parent plant is the F1 hybrid you are purchasing. As compared to field cucumbers, these varieties are very thin skinned and seedless. They are usually referred to as "European" or "Seedless", and are bitter free. Therefore you do not need to peel the skin off these cucumbers. They are an all female or mostly female plant: Each blossom, if properly cared for, will become a cucumber. The germination rate for these varieties is 95% to 100% when germinated properly. Cumlaude - Cucumber Seed - 15 - 16 inch. You do not need to peel the skin off these cucumbers. Each blossom, if properly cared for, will become a cucumber.