- You Will Get 25 Seeds Of Tomato Mountain Spring F1 Hybrid Beefsteak Vegetable Seeds. - Watering: Light. - The Tomato Mountain Spring is a great Beefsteak Tomato that will produce many fruits that get 8 to 10 oz and they are firm. - This variety is a Determinate that will do well in a #5 pot it will get 36” to 48” tall and spread about 28” This is a great slicing tomato will take about 70 days to harvest does well in cool climate areas.