Every sauce garden seems to start from the same assumption: “I know Roma’s are the best for pasta sauce.” That’s exactly where a grower named Anewvogue began when planning a pasta sauce bed.
That assumption is not wrong, exactly, but it hides a mismatch in the plum tomatoes vs Roma question itself. Plum describes a shape. Roma is one specific variety that happens to have that shape, not a rival category standing across from it.
Sorting that out matters more than it sounds like it should. A lot of buying and growing confusion traces straight back to treating plum and Roma as two different things to choose between.
The short version
Plum tomatoes vs Roma is not an apples to apples comparison, because Roma is a plum tomato. Plum describes the elongated, oval shape and meaty, low water flesh. That build is common to a whole family of sauce and paste varieties.
Roma is the most famous member of that family, not a competitor to it. Other real plum varieties exist alongside Roma, including San Marzano, Amish Paste, and several less common heirlooms.
Even federal produce grading treats plum as an informal term. The USDA’s own grading standard for fresh tomatoes names cherry and pear shaped types specifically. It does not name plum as an official type at all.
What plum tomato actually means
Plum tomato is a shape description, not a variety name. University of Maine Cooperative Extension’s guide to canning tomato varieties groups several distinct varieties under that plum, paste type umbrella. Roma, Amish Paste, San Marzano, Italian Gold, Hogheart, Granadero, Opalka, Oxheart, and Roman Candle all qualify.
Every one of those is elongated with thick walls, small seed cavities, and low water content. Those are the traits that make a tomato good for sauce, salsa, or paste. Roma just happens to be the one most gardeners and grocery shoppers meet first.
The gap in the official record
Here is a detail almost no one checks. The USDA’s own United States Standards for Grades of Fresh Tomatoes does not define plum as an official type. Cherry tomatoes get their own named category, cerasiforme type, and pear shaped tomatoes get one too, pyriforme type.
Plum gets neither. The standard describes some shape irregularities, like elongated or kidney shaped fruit. Those show up only in the context of grading defects, not as a recognized category of its own.
That gap does not mean plum tomato is a meaningless term. Gardeners, seed companies, and grocery shelves use it constantly, and everyone understands roughly what it means.
It does mean this comparison is looser than it sounds. A widely used informal label is being set against one specific variety within it.
Roma, the one everyone means by default
Roma earned its default status honestly. This site’s paste tomato guide covers the full case for it: a determinate plant that delivers its crop in one concentrated flush, with wide disease resistance and reliable yields.
That combination makes it the workhorse of home canning. The fuller comparison against San Marzano lives at our paste tomato varieties guide.
Sherib381, replying to Anewvogue on that same Garden.org thread, offered a real alternative. An Opalka plant, another true plum variety, was that poster’s pick for sauce making.
The other plum varieties Roma overshadows
Opalka is worth knowing on its own terms. Victory Seed Company traces it to Poland around 1900. It is an indeterminate heirloom that grows nearly five feet tall and needs sturdy support.
Its fruit runs unusually long for a plum tomato, up to six inches, tapering to a blunt or pointed tip. Specimens can weigh ten to twelve ounces or more. Victory Seed describes it as meaty with few seeds and minimal juice, with good flavor and balanced acidity for a paste type.
University of Maine Extension’s list names several others worth knowing exist, even without a full profile here. Italian Gold is a pear shaped, high pectin paste variety.
Hogheart, Granadero, Oxheart, and Roman Candle round out the lineup. Each is a genuine plum type tomato with nothing to do with Roma specifically.
What this means when you are actually choosing
The real decision was never plum versus Roma. It is which plum variety fits the garden or the recipe. This site’s paste tomato guide breaks down the most consequential real choice in full: Roma’s canning day flush against San Marzano’s season long trickle.
Beyond those two, Opalka is worth trying for gardeners who want an heirloom with real size and flavor. The other Maine Extension varieties are worth chasing down in seed catalogs for anyone who wants to compare beyond the usual two names.
Frequently asked questions
Is a plum tomato the same as a Roma tomato?
Roma is one variety of plum tomato, not a separate category. Plum describes the elongated shape and meaty, low water flesh. Several other varieties, including San Marzano, Amish Paste, and Opalka, share that same shape classification.
Why do people compare plum tomatoes to Roma tomatoes?
Roma is the most widely grown and widely sold plum type variety. Many gardeners and shoppers use the two terms interchangeably, without realizing plum is the broader shape category and Roma is just one example within it.
What other tomatoes count as plum tomatoes besides Roma?
San Marzano and Amish Paste are the best known alternatives. University of Maine Extension also lists Italian Gold, Hogheart, Granadero, Opalka, Oxheart, and Roman Candle as genuine plum type sauce and paste varieties.
Does the USDA officially define what a plum tomato is?
No. The USDA’s grading standard for fresh tomatoes names cherry and pear shaped types specifically but does not create an official plum category. Plum tomato is a widely used informal term, not a federally defined type.
Which plum tomato is best for sauce, Roma or something else?
Roma wins on convenience, since its determinate habit delivers the whole crop in one concentrated window ideal for a canning day. San Marzano and Opalka both offer more size or flavor for gardeners willing to trade that convenience away.
Bottom line: plum tomatoes vs Roma sets up a comparison that does not really exist, since Roma is a plum tomato, not a rival to the category. Plum describes shape and flesh type, and several genuine varieties share it: San Marzano, Amish Paste, Opalka, and lesser known names like Italian Gold and Granadero. Even the USDA’s own grading standard skips plum as an official type, unlike cherry and pear. The real choice worth making is which plum variety suits a specific garden or recipe, not plum against Roma. For the deeper Roma versus San Marzano decision, see this site’s paste tomato guide at our paste tomato varieties guide.
SOURCES
University of Maine Cooperative Extension: Best Types of Tomatoes for Canning. https://extension.umaine.edu/food-health/2023/07/24/best-types-of-tomatoes-for-canning/
United States Department of Agriculture, Agricultural Marketing Service: United States Standards for Grades of Fresh Tomatoes. https://www.ams.usda.gov/sites/default/files/media/Tomato_Standard%5B1%5D.pdf
Victory Seed Company: Opalka Tomato. https://victoryseeds.com/products/opalka-tomato