If your big tomatoes are coming out lumpy and scarred on the bottom, with folds, holes, or a stretched-open look, that is catfacing. It looks alarming, but it is harmless to eat and entirely preventable once you understand what triggers it. Here is the cause and the practical fix.
What catfacing looks like, and what causes it
Catfacing shows up as severe scarring and distortion at the blossom end (the bottom) of the fruit: puckering, brown corky bands, deep folds, and sometimes open cavities or protrusions. It mostly affects large-fruited types, especially big beefsteak and heirloom tomatoes.
The cause is a disruption during flower formation. When the flower develops under stress, the parts that should become a smooth fruit do not form correctly, and that flaw is locked in. By the time the misshapen tomato appears, the damage happened weeks earlier. The most common triggers:
- Cold temperatures during flowering. This is the big one. Nights below roughly 50 to 55 degrees Fahrenheit while flowers are forming are the classic cause. Planting out too early, before nights have reliably warmed, is the usual mistake.
- Other stress at bloom: wide temperature swings, very high heat, drought stress, or heavy disturbance to the plant.
- Excess nitrogen or aggressive pruning that pushes too much rapid vegetative growth can also play a role.
The fix: protect the flowers, get the timing right
Because the damage is set during flowering, the entire fix is about avoiding stress in that window. There is no rescue spray and nothing to apply to the soil.
Prevent catfacing
Wait to transplant
Do not rush tomatoes into cold ground. Set them out only after nights are reliably above the mid-50s Fahrenheit. Use your local frost dates to time it, not the calendar or a warm afternoon.
Protect against cold snaps
If a cold night threatens after you have planted or while plants are flowering, cover them with row cover, cloches, or buckets overnight. A few protected nights can save a whole flush of fruit.
Steady the conditions
Keep watering consistent and avoid big stress events at bloom. Mulch to buffer soil temperature and moisture swings.
Go easy on nitrogen and pruning
Avoid heavy nitrogen feeding and aggressive pruning that forces a burst of fast growth, which can worsen flower deformities.
Choose the right varieties
Smaller-fruited tomatoes (cherry, grape, paste, and many modern hybrids) catface far less than large heirlooms and beefsteaks. If catfacing is a recurring problem, shift your variety mix.
Get your timing from real dates, not guesswork
The single most effective prevention is not transplanting too early, and that means working from your actual local frost and temperature dates rather than a hopeful warm week in spring. Use the planting calendar and your frost dates to set out tomatoes only once cold nights are behind you. The tomato profile covers transplant timing and variety selection in more detail.
How catfacing differs from other tomato problems
It is easy to lump tomato deformities together, but they have different causes and fixes:
- Catfacing: puckered, scarred, deformed blossom end from cold or stress at flowering. Fix with timing and protection.
- Blossom end rot: a smooth sunken dark patch on the bottom, tied to calcium movement and uneven watering. A different problem with a different fix.
- Growth cracks: clean splits in the skin from rapid water uptake. See growth cracks for that one, which is solved with even watering.
Telling them apart matters because the fix is specific to each. Catfacing is the one you solve before you ever plant, by reading the weather.
FAQ
Are catfaced tomatoes safe to eat?
Yes. Catfacing is a cosmetic and physiological deformity, not a disease, so the fruit is safe to eat. Trim away the scarred, corky tissue at the blossom end and use the rest, sauce and paste are great uses.
What causes catfacing in tomatoes?
Cold or stressful weather during flower formation, most often nights in the low to mid 50s Fahrenheit or colder while flowers are developing. Excess nitrogen and aggressive pruning can contribute. The deformity is locked in at flowering, weeks before the misshapen fruit appears.
How do I prevent catfacing?
Do not transplant tomatoes until nights are reliably above the mid-50s, protect flowering plants from cold snaps with row cover or cloches, keep conditions steady, avoid heavy nitrogen, and favor smaller-fruited varieties that catface less.
Is there a spray for catfacing?
No. Catfacing is a physiological disorder, not an infection or pest, so no fungicide, insecticide, or fertilizer treats it. The only effective measures are timing, cold protection, steady conditions, and variety choice.
Catfacing is fixed before you plant, not after. Get your transplant timing right with the planting calendar, protect flowers from cold, lean on smaller-fruited varieties, and the deformities stop. For the crop itself, see the tomato growing profile.
