San Marzano tomatoes can be identified easily by their oblong shape and pointed ends. Strong and sweet in flavor and less acidic, this old-fashioned tomato is a favorite snack of many gardeners. Growing them is very easy, starting from transplanting its seedlings when they are 6 to 12 inches tall. Then place them near a wall or fence or offer them a stake or strong cage for extra support. San Marzanos prefer full sun, like all tomato plants, preferably in a location that gets at least 6 to 8 hours of sunlight daily. Also, use a 5-10-10 fertilizer, which is low in nitrogen to fertilize foliage enough to keep the plant healthy and focus the nutrition on the fruit bearing.

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Source: The Spruce