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 indeterminate F1 hybrid tomato varieties are produced in Holland. They should be pruned when grown in a greenhouse. Our technical manual (Item # 9P098) offers tips on their culture and pruning technique. F1 hybrids are grown 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. The germination rate of these varieties ranges from 85% to 100% Trust Tomato Seed - Beefstake Variety about 8.0 ounce.