There’s nothing quite like growing your own tomatoes, but let’s be honest—these plants can be drama queens. One day they’re doing great, and the next day you’re wondering what went wrong.
The good news? Most tomato problems are fixable if you catch them early. I’m sharing seven warning signs that your plant needs help, plus simple ways to get it back on track. Let’s make sure your tomatoes actually make it to your plate this year!
1.) Yellowing Leaves From Bottom Up
When you notice the lower leaves on your tomato plant turning yellow and dropping off, it’s often a sign of nitrogen deficiency. Your plant is basically running out of fuel as it puts energy into producing fruit.
Fix this by adding a balanced fertilizer or some compost around the base of the plant. Side-dress with a nitrogen-rich fertilizer every few weeks during the growing season.
If only a few bottom leaves are yellow, don’t panic—this can be normal as the plant matures. But if it’s spreading upward quickly, take action.
2.) Blossom End Rot Appears
Blossom end rot shows up as dark, sunken spots on the bottom of your tomatoes. It’s not a disease—it’s a calcium problem caused by uneven watering. When soil moisture swings from bone dry to soaking wet, your plants can’t absorb calcium properly.
Fix this by watering deeply and consistently, about 1-2 inches per week. Mulch around your plants to keep soil moisture steady. Skip the cal-mag sprays and focus on regular watering instead.
The affected tomatoes won’t recover, but new fruit will grow in healthy once you get watering under control.
3.) Wilting Despite Adequate Water
When your tomato plant looks droopy even though the soil feels damp, you might be dealing with root rot or a fungal disease. This happens when roots can’t absorb water properly, often from overwatering or poor drainage.
Check the roots by gently digging near the base. Healthy roots should be white or tan, not brown and mushy. If they’re damaged, cut back on watering and improve drainage by adding compost or perlite to the soil.
Sometimes wilting despite moisture means Fusarium wilt, a soil-borne disease that’s harder to fix. Consider disease-resistant varieties next season.
4.) Stunted or Slow Growth
If your tomato plant looks like it’s frozen in time and barely putting out new leaves, something’s wrong with its growing conditions. This usually means the soil is lacking nitrogen or the plant isn’t getting enough sunlight—tomatoes need at least 6-8 hours of direct sun daily.
Check your soil temperature too. Tomatoes won’t grow much when soil stays below 60°F. Feed with a balanced fertilizer, make sure drainage is good, and consider transplanting to a sunnier spot if needed.
5.) Leaf Spots and Discoloration
Spotted leaves on your tomato plant usually mean fungal diseases like early blight or septoria leaf spot. These show up as brown or yellow spots with rings, and they spread fast in humid weather. Remove affected leaves right away and throw them in the trash, not your compost pile.
Water at the base of the plant in the morning so leaves can dry out during the day. Space plants about 24 inches apart for good air flow. Apply mulch to prevent soil from splashing onto lower leaves during rain.
6.) Fruit Cracking or Splitting
You know those unsightly cracks that zigzag across your ripening tomatoes? That happens when your plant gets uneven watering. The fruit grows too fast on the inside, and the skin can’t keep up.
To prevent this, water your tomatoes consistently—about 1-2 inches per week. Mulch around the base to help the soil retain moisture. During hot summer months, check the soil daily and water in the morning.
Cracked tomatoes are still safe to eat, but use them quickly since they spoil faster than intact fruit.
7.) Flowers Drop Without Fruiting
You’ll notice yellow flowers appearing on your tomato plant, but instead of turning into fruit, they just fall off. This usually means your plant isn’t getting pollinated properly or the temperature is off.
When nights drop below 55°F or days climb above 90°F, tomatoes struggle to set fruit. Try gently shaking your plants each morning to help with pollination, or use a small paintbrush to transfer pollen between flowers.
Adding a balanced fertilizer can help too, but avoid too much nitrogen since it promotes leaves over fruit.
