Green shouldered heirloom tomatoes are sweeter and have more flavor than genetically engineered commercial tomatoes that have a uniform ripening gene. That g… Video Rating: 5 / 5 Question by Emily Coneys: when are my roma tomatoes going to ripen? i have five visible green tomatoes, and i am new to romas. my biggest ones are the size of 1-2 golfballs. how long should it be until te first harvest? Best answer: Answer by FreedomTomatoes will not begin to ripen until they are fully mature. After maturity, it could take 2 to 3 weeks to… Read Article →