The Price of a Perfect Tomato: What Our Kitchen Learned Growing Forty Varieties
One season, forty tomato varieties from six countries, one rooftop, one ledger. Which ones paid for themselves in flavour per square metre, which ones were a waste of water, and the surprising winner that cost eleven cents a fruit.
Restaurants talk about heirloom tomatoes the way wine lists talk about vineyards, but almost nobody publishes what they cost to grow, what they yield, and whether the flavour justifies the space. Our field desk kept a ledger through a full season on a rooftop garden of 60 square metres, growing forty varieties from Italian, Mexican, Spanish, Japanese, American and Peruvian seed. Every plant was weighed, every fruit tasted blind by the kitchen, and every hour of watering logged.
The headline: flavour and yield are almost unrelated, and both are unrelated to price. The most expensive seed, a Japanese momotaro at nearly a euro per seed, produced beautiful, mild fruit that the kitchen ranked in the bottom third. A Mexican cherry variety from saved seed, effectively free, ranked second for flavour and first for yield per square metre.
The ledger
- Best flavour per square metre: an Italian Piennolo del Vesuvio, small, thick-skinned, intensely sweet-acid, 4.2 kg per plant, ranked first blind by seven of nine tasters. Cost per fruit including water and compost: 11 cents.
- Best yield: a Mexican wild cherry (tomatillo-sized, not to be confused with the husked tomatillo), 6.8 kg per plant, second for flavour. Needed staking twice a week.
- Worst return: a large American beefsteak heirloom, 1.9 kg per plant, cracked in every rain, ranked mid-table. Cost per fruit: 1.40 euros. Beautiful on a plate, ruinous on a ledger.
- Water: the small-fruited varieties used 40 percent less water per kilo of fruit than the large ones, because large fruit split and were discarded after every heavy watering.
What we planted for next year
Eight varieties instead of forty, all small or medium, three of them from saved seed. The kitchen lost the glamour of a 600-gram striped beefsteak and gained a thousand tomatoes that taste of something. If you have one square metre and one plant to choose, choose the Piennolo, water it less than you think, and pick it a day later than you want to.
