Tomato plants not flowering is a major problem as your plant won’t be able to grow the delicious red fruits. This happens when your plants are under stress due to temperature fluctuations, insufficient light, or inadequate watering.Tomato Plants Not Flowering

Our gardening team will help you learn more about this annoying problem and how to fix it, so read on.

Why Are The Tomato Plants Not Flowering?

The tomato plants are not flowering because of the temperature changes that are happening, or due to the insufficient sunlight around it, and it may be having poor soil conditions. In addition to this, the lack of nutrients, inadequate watering, and incorrect pruning can hinder the blooming as well.

– Temperature Changes

Tomatoes thrive in temperatures between 55 and 85 degrees Fahrenheit. Therefore, temperatures below and even above this range will reduce tomato flowering and the plant’s inability to produce its fruit. This usually happens because of inadequate growing conditions, including the change of the temperature when it suddenly fluctuates or rises so high that it goes through stress.

Plants can survive chilly weather, but the frost usually kills them. So, you should wait until the last frost has passed to sow the seeds. If the temperature accidentally drops during an unexpected storm, your plants won’t immediately die. Instead, they’ll get into survival mode and reserve their energy. As a result, the plant might not flower or stop flowering because it’s trying to preserve its energy until the weather is warm again.

Some tomato types are more tolerant of heat, like the Solar Fire, Summer Set, and Heatmaster varieties, so they might still flower if the temperature increases above the 85 degrees Fahrenheit level. But even these varieties won’t be able to tolerate ultra-high temperatures, which is why you will see the stems weaken also and this way it would hinder the ability to shoot any flowers.

Scorching hot temperatures burn the flowers of the tomato plant, so you might see dry, withered flowers on the soil. The plant gets rid of them to preserve its energy and protect itself, and it won’t have the right strength to bloom in the longer run.

The temperature might be too cold if your plant isn’t producing flowers. On the other hand, if you see dry and dead flowers on the soil, then the temperature is too hot. Even after flowering, the blossom drops if the temperature is too cold or too hot.Why Are Tomato Plants Not Flowering

– Not Enough Sunlight

Tomatoes are warm-season crops that need at least six to eight hours of sunlight for the seedlings to germinate. When there isn’t enough sunlight, the plant has limited energy and can’t produce flowers. This can be due to the location where you have set it, and it isn’t receiving the proper amount of sunlight, or also because there are too many clouds that aren’t letting sunlight to pass.

Flowering is energy-consuming, and without enough sunlight, the plant will experience weakened growth. As a result, the stems and leaves will be weak, and the plant won’t be able to produce flowers, because it didn’t receive enough light to produce the right amount of chlorophyll and thrive.

Without enough light, indeterminate tomato plants will grow tall to reach out for sunlight. These plants will produce a few flowers that turn into tomato fruits. Determinate tomatoes, on the other hand, will reach their mature size before producing any tomatoes, so keeping them in the shade means they won’t produce any flowers or fruits.

Some tomato varieties can survive while receiving four hours of sunlight, and this would vary from the type. Yet, these plants won’t produce as many tomatoes as those that receive more light. This is why it’s crucial to pick a spot for planting your tomatoes where they receive some morning and afternoon sunlight. Midday sunlight is also essential but is too intense and might scorch the plant.

– Poor Soil Conditions

Your tomato plant grows in warm soil, so if the soil is too cold before planting the seeds, they won’t germinate. These plants thrive in neutral to slightly acidic soil that should be rich in nutrients.

Any changes in these conditions will affect the health of the tomato plant and prevent it from flowering and then growing fruits. At the same time when the soil is not rich in nutrients, due to the lack of fertilization, you will also see it weakening and growing in a gloomy way.

Unless the soil has the right balance between sand and clay, it won’t support the roots of the tomatoes, and the seedlings will struggle to germinate. Therefore, growing your plants in soil with a good texture that allows water and air to pass through freely is essential. Otherwise, your plants will struggle to grow and will eventually die.

– Lack of Nutrients

Tomatoes are heavy feeders, so you won’t be able to grow these plants unless you have fertile and organically-rich soil. Phosphorus is an essential nutrient that helps your plants thrive. Without these macronutrients, your plants will experience stunted growth, and they might not flower, and also be weakened and this way, you will see the plant not growing much either.

This usually happens because you have inferior soil, to begin with. If your garden has inferior soil, you shouldn’t grow tomatoes before adding nutrients to elevate their nutrient content. It might also happen because you haven’t restored the nutrients depleted after growing your last tomato harvest.

Growing your tomatoes next to some heavy feeders can also affect their growth and prevent them from flowering. These include melons, corn, cucumbers, broccoli, and cabbages because they would be the ones taking the nutrients. These heavy feeders will compete with tomatoes for nutrients and might prevent them from flowering.

– Inadequate Watering

Tomatoes require regular and sufficient watering to stay healthy and grow flowers that later become fruits. Unfortunately, many novice gardeners might accidentally overwater or underwater their plants because they’re unsure about the proper watering schedule. In both cases, your plants will suffer, and they might not grow any flowers.Watering Tomato Plants

Adequate moisture levels help deepen the roots, making plants more resistant to pests and diseases. It will also encourage flowering and prevent the fruits from cracking, so thee excess of it, and the lack of it will not let any blooms develop.

– Incorrect Pruning

Regular pruning is one of the best ways to keep tomato plants healthy and encourage flowering. But, even if you’re providing your plant with adequate growing conditions, it might not flower if you’re not pruning it regularly. You may have pruned it too much, that it no longer has the ability to shoot stems that will bear flowers.

Allowing side shoots to grow or leaving them after they grow is one of the main reasons why your plant might not flower. These side shoots consume the plant’s energy, so it won’t be able to grow flowers and fruits later. Without regular pruning, the plant will keep producing more foliage and new suckers, but you won’t see any tomato flowers growing.

What Are Solutions To Help Your Tomato Plants to Flower?

The solution to help your tomato plants to flower is to provide them with adequate temperatures, and the right amount of sunlight. In addition, you should also amend the soil, and give the right amount of water, and make sure that you regularly prune it.Solutions To Tomato Plants to Flower

There are several ways to encourage flowering. Maintaining adequate temperatures and protecting your plant from temperature changes, watering adequately, and fertilizing your plant at the right time will promote flowering. You can also try hand pollination to produce more flowers and fruit.

Tomatoes are suitable for those who want to start their vegetable garden because they’re easier to maintain than other fruits and vegetables. As long as you provide your plants with enough sun and water and grow them in fertile soil, they’ll develop their fruits in two to three months.

– Provide Your Plant With Adequate Temperature

Before you plant your tomatoes, you should ensure that the variety you pick suits the average temperature in your climate. But if the temperature changes, several solutions will solve this problem.

First, you should check the weather forecast to see if the temperature changes are temporary. In most cases, your tomatoes will be able to survive a temporary increase or decrease in temperature.

If a heat wave lasts for a long time, you can use different structures to shade your plants and cool the surrounding area. If you’re growing tomatoes in containers, you can easily move them around to protect them from the strong midday sunlight.

More watering can save your plants during heat spells. Using fans to improve air circulation and cool off your tomato containers can also help, and you would cool the surrounding down, because the heat will scorch its ability.

If the temperature doesn’t seem to increase enough to support the growth of tomatoes, you can warm up the soil by covering it before sowing your seeds. Covering the soil with black or red plastic will retain the heat to keep the soil warm. At the same time, you can also opt to be using a row cover will also boost growth and encourage flowering.

It’s essential to take notes of daytime and nighttime temperatures to see if your tomato plants are able to survive, flower, and fruit. Tomatoes thrive in USDA zones 2 to 11, but you might be growing a variety that doesn’t work for your hardiness zone.

– Provide Adequate Sunlight Exposure

The flowering process consumes a lot of energy, so if you’re not sure that there’s enough light in your garden to help your tomatoes grow, you can grow your tomatoes in containers. This allows you to easily move the containers to ensure that your plants receive at least 6 hours of sunlight.

If you grow tomatoes in your garden, ensure that nearby structures or buildings do not shade them. Trim nearby trees or plants in case they’ve grown too tall to obstruct the sunlight. Tomato plants will grow their yellow flowers with enough nutrients and sunlight. You can use a tomato fertilizer high quality water soluble plant food like Miracle Gro food.

In addition, if you see that the tomatoes have too many flowers but no fruit, this is probably caused by insufficient sunlight. Ensure your plant receives 6 to 8 hours of direct sunlight to encourage fruiting. Using Espoma Tomato Tone or Jobe’s Tomato Fertilizer Spikes will encourage your plants to grow bigger and develop more fruits.Tomato Plants Not Flowering Details

– Amend the Soil

Tomatoes deplete the soil with the necessary nutrients, so growing them season after season will make the soil too poor to support new growth. Moreover, nitrogen-rich soil will encourage the growth of more foliage but won’t promote flowering and producing fruit.

This is why it’s crucial to provide your soil with the right type and amount of fertilizer to encourage flowering. You can also be more significant and try to test the soil, as this way you would go ahead and check what nutrients are missing and place those types of nutrients.

Using organic compost is one of the best ways to prepare the soil before sowing the tomato seeds. An all-purpose fertilizer will also work for your plants. After a month and up to 60 days, the yellow star-shaped flowers appear on your plant.

Once you have planted your tomatoes, you must fertilize them using a phosphorus-rich fertilizer like Hi-Yield Super Phosphate or Bonide 969 Triple Super Phosphate once every three weeks. One pound of fertilizer with an NPK ratio of 6-24-24 or 8-32-16 should be applied per 100 square feet of your garden. If you have a smaller garden or grow your tomatoes in containers, add one or two tablespoons of fertilizer every three weeks to a month.

– Supply Adequate Watering

Insufficient or overwatering tomatoes can both lead to delayed or absent flowering. So, you should start watering the plants right after sowing the seeds to help the soil settle and encourage rooting. Do note that this would depend on your tomato type, flowers grow five to almost seven weeks after sowing seeds.

Adding mulch will help retain moisture and keep your plants well-hydrated, and this is the reason why you should examine the soil regularly to guarantee that your plants receive enough water. You can check by sticking up your finger up to two inches in the soil, so if it sticks to your hand, you’re providing enough hydration.

Too much water leads to root rot, preventing flowering and killing your plants. If you’ve been overwatering your plants, take out the plant and remove the rotten roots. Then, you must replant your plants in a new location and water adequately.

– Ensure to Regularly Prune

Regular pruning and maintenance will help you detect problems in your tomato plants before they get worse, and it’s one of the easiest pest control methods. Some pests and diseases are treatable, while others won’t be cured, and it’s better to remove the plant and destroy it before it infects nearby plants.

You should remove the bottom leaves as soon as the plants start growing, as these leaves are more prone to fungal diseases. All the dead leaves and flowers should be removed too.

Too many blossoms will deprive the plant of the energy it needs to produce fruits. If you see too many blossoms on a plant measuring 12 to 18 inches tall, you should pick them up to encourage the plant to grow a little stronger. On the other hand, depending on the variety, you might need to remove some blossoms if too many are growing on the same branch.

Prune any new suckers to encourage flowering, and cut off leaves that might shade most parts of the plant, preventing it from producing energy to promote flowering. You should remove suckers that grow where the branches meet the stem. You should also remove the leaves at the bottom of the plant.

However, ensure that you don’t prune the plant too much because, with fewer leaves left, your plant will produce less energy. After it has gathered its energy back, you will see the first sign of pollination just as the stem swells a little.

If it doesn’t remain green, swell, or turn yellow, this is a sign of failed or poor pollination, and you won’t see any fruit growing. On the contrary, some types will fruit within 40 days after planting them, while others can take up to 60 days. The temperature, sunlight, and nutrient supply will also affect this period.


Tomatoes are easy to grow and yield a good yield with a few tips, so here are the key points to keep in mind:

  • Lack of sunlight and changes in temperature are the main reasons why your tomatoes might not flower.
  • These plants require consistent watering to produce yellow flowers that later become fruits.
  • Tomatoes are heavy feeders and should be fertilized regularly during the growing season.
  • Despite these problems, your tomato plant can still be saved by adjusting temperature and lighting, feeding the plant regularly, and regular pruning.
  • Stressing tomatoes is the main reason why you might not see their flowers, and it can happen for several reasons. Without flowers, the plants won’t be able to set fruit.

With our gardening tips, you can expect to enjoy a big harvest of your tomatoes by keeping them in perfect health.

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