06/07/2026
The Baking Soda Tomato Myth
If you’ve spent any time on social media looking for gardening advice, you’ve probably run across this popular tip…
“Sprinkle baking soda on the soil around your tomato plants to get the sweetest tomatoes you’ve ever tasted!”
It sounds like a magical, cheap kitchen hack. But before you grab that box from your pantry, STOP. Don't do it. Not only does it not work, but it can actually damage or kill your plants.
The logic? behind the viral trend goes something like this…
Tomatoes are naturally acidic.
Baking soda is alkaline (the opposite of acidic).
Therefore, putting baking soda in the soil will lower the acid in the plant, making the tomato taste sweeter.
While that sounds like a simple chemistry lesson, plant biology doesn't work that way.
Flavor comes from SUN and GENETICS. Through a process called photosynthesis, a tomato plant's leaves soak up sunlight and turn it into sugars. The plant then pumps those sugars directly into the growing fruit. Changing the acidity of the soil won’t magically force the plant to create more sugar.
Not to mention that BAKING SODA IS TOXIC TO PLANTS!
The chemical name for baking soda is sodium bicarbonate. The biggest problem here is the first word…sodium (salt).
Plants do not like salt. When you put baking soda into the dirt, the sodium builds up. This does two terrible things to your garden.
First, it blocks water and food. High salt levels destroy the structure of the soil, making it harder for the roots to breathe and absorb water.
Second, it causes "Nutrient Lockout". Tomatoes love slightly acidic soil. Baking soda makes the soil highly alkaline. When soil becomes too alkaline, the plant gets "locked out" from absorbing essential nutrients like iron and phosphorus.
Putting baking soda in your soil won’t make your tomatoes sweeter, but it will stunt their growth, turn their leaves yellow, and potentially kill the vine.
What Actually Makes Tomatoes Sweeter? If you want candy-sweet tomatoes, skip the grocery aisle hacks and try these proven, science-backed methods instead.
PICK THE RIGHT VARIETY! If you want pure sweetness, plant varieties like Sun Gold or Super Sweet 100. They are genetically bred for higher Brix (sugar).
Put your plants in the sunniest spot you have. More sun means more photosynthesis, which means more sugar in your fruit.
When your tomatoes reach full size and just start to turn red, ease up on the watering. Less water dilutes the fruit less, concentrating the natural sugars.
Potassium is the specific nutrient that helps plants move sugars into their fruit. I’ll get into that more next week.