Causes of Purple Tomato Seedlings

Most gardeners, mistrusting purchased nightshade plants, prefer to germinate the seed material on their own. And therefore, they often encounter such a phenomenon as purple tomato seedlings. This shade can have leaves or trunks of seedlings. And there are situations when tomato seedlings are completely purple. To get rid of such an unusual color of plants, you need to understand the causes of this phenomenon.

Causes of Purple Tomato Seedlings

The reasons for the purple color of tomato leaves

Violet tomato seedlings can only be in a few cases. The first reason is incorrect temperature conditions. Still purple leaves or stems may be due to lack of nutrients in the ground. Phosphorus is such a substance.

These two reasons are directly related. If the air temperature is below the set, the tomato will not be able to properly absorb phosphorus. And this means that the seedlings will turn purple.

The main causes of purple are:

  • phosphorus deficiency;
  • low or too high temperature conditions.

Why tomato seedlings are purple? The temperature regime for seedlings is correct and phosphorus is introduced into the earth clearly according to the scheme, and the leaves are still purple. Another reason why a tomato may have such a shade is an insufficient amount of light. In order for tomatoes to turn green, you just need to provide them with additional lighting.

Symptoms of phosphorus deficiency in plants

The tomato constantly needs fertilizer. The lack of nutrients leads to the fact that the culture can simply die. If the soil was not initially saturated with microelements, from below the seedlings become stunted and acquire a purple hue.

Spots on the leaves indicate phosphorus deficiency.

Over time, the purple leaves begin to curl and stick to the trunk. The stem at this time becomes more rigid and brittle. With a lack of phosphorus in tomato seedlings, the roots begin to fade. If you do not saturate the plant with this useful substance, then it will simply die.

Phosphorus is used to feed tomatoes from the time they are planted until the fruits are obtained. But he plays a big role in the period of active growth. When the seeds begin to germinate, this beneficial substance affects the formation of the roots. Phosphorus also allows you to get the first crop early and in a fairly large amount. Tomato seedlings throughout the entire time accumulate the substance in themselves and also spend it in the process of growth.

Lack of phosphorus leads not only to become purple leaves near tomato seedlings, but also to poor absorption of nitrogen. And this substance also plays an important role in the process of tomato growth.

Feeding tomato seedlings with phosphorus

In order for the purple leaves of tomato seedlings to acquire a pleasant green color, it is necessary to fill the lack of phosphorus. This will allow:

  • improve the condition of the root system;
  • the leaves will turn green;
  • the fruits will begin to tie early;
  • you end up with delicious tomatoes.

But there are situations when phosphorus is not at hand, what to do then. In such cases, the plant can be helped by helping using a special infusion of litter and ash. For the first time this seedlings will be enough, but you need to try to quickly acquire phosphorus.

Phosphorus deficiency negatively affects seedlings

It is possible to compensate for the lack of phosphorus only with the help of special preparations that are sold in any gardening store. To deal with this problem can only be such a substance. For this, boric acid is often used. It can be bought at any pharmacy.

In gardening stores you can find fertilizers saturated with phosphorus, several types. The most popular are liquid and powdered. If the tomato seedlings have turned purple, then it is better to take a liquid remedy. Gardeners recommend using a fertilizer such as superphosphate.

It is universal in use and is great not only for tomatoes, but also for other plants. It is possible to carry out top dressing with this means in any period of culture growth.

We fertilize correctly

Fertilizing should be done as carefully as possible, because a large amount of it can also negatively affect the growth of tomatoes. It is worth remembering that if you have already deposited superphosphate in a certain area, then this is not worth doing every year. After all, such a substance is contained in the soil for 2-3 years.

People who grow tomato seedlings have a special table. It indicates how much and when it is worth feeding. After all, they are also not protected from the fact that the plant can acquire a purple hue. If you are not a professional, but just an amateur, then you do not need such calculations.

For open ground, a dry mix is ​​often used, which is applied in spring or autumn. One square meter needs only 40 grams of fertilizer. It is advisable to do this before the earth is dug. But for seedlings, it is better to use a liquid remedy. To do this, you need to dilute 20 grams of the drug in 10 liters of water.

This mixture should be infused for 24 hours. Then you can safely process the seedlings. This will allow for a short time to return green leaves to the plant. Such they become already a few days after fertilizing.

Air temperature and seedling lighting

It happens that the seedlings turned purple, not because of a lack of phosphorus, but because the air temperature in the room is lower than expected. Tomatoes grow well at temperatures above 15 degrees with a plus sign. If it becomes lower, then nutrients can not be properly absorbed and the plant slowly dies. The first signs of heat shortage are purple foliage.

In order to fix this trouble, you need to transfer the seedlings to a warmer place. Also, plants can become lilac in color due to lack of lighting, especially in winter. To fix these two reasons at the same time, you can lay a foil between the box and the armrest. It will allow you to give additional lighting and protect the seedlings from the cold.

If after such manipulations the seedlings did not turn green, then you should choose another place for it. Plus, carry out additional lighting. This should be done artificially using an LED lamp. After a certain period of time, you will notice how the tomatoes have become a beautiful green color.

Preventive measures

Seedling needs to be looked after correctly

In order for the seedlings not to acquire a purple color, it is necessary to properly care for it from the moment of planting. Tomatoes are vegetables that are used to a warm and dry climate. Therefore, in order for them to grow and develop well, it is necessary to provide them with the following:

  • good lighting;
  • warmth;
  • regular watering;
  • airing;
  • regular phosphorus fertilizer.

Tomatoes do not like soils that have too much acidity. Also, do not plant plants too close to each other. As soon as the seeds hatch and get a little stronger, they should be planted in different containers. A large amount of nitrogen in the soil can also lead to a variety of diseases.

The air temperature in the room should not be less than 15 degrees with a plus sign and not higher than 35. Watering the tomatoes should also be clearly according to the scheme. After all, a lack of water will lead to drying out of the roots, and its excess will rot. Also, tomato seedlings can be made more resistant to temperature extremes and phosphorus deficiency.

We strengthen tomato seedlings

So that tomato seedlings do not become purple, it can be strengthened. After all, the more powerful the seedlings, the less they give in to various misfortunes. The strengthening process must be done before the seeds are sown. For this, the seeds should be soaked in a solution of epin. This is a tool that allows you to accelerate growth and develop resistance to temperature extremes and diseases.

It is also recommended that the plant be watered not with ordinary water, but with an infusion of humate. Only its concentration should be minimal. Humate should be bred as follows:

  • 1 teaspoon of the substance;
  • a little boiling water;
  • stir the mixture;
  • add two liters of water to the container.

This solution should be diluted again before watering. 100 grams of diluted humate should be mixed with 1 liter of water. This scheme is used to water the seedlings once. The concentrate of this product can be stored for a long time.

If you take preventive measures and prepare seeds correctly before planting, then your seedlings will not turn purple. The main thing is to regulate the temperature regime and the amount of phosphorus in the soil.


Everyone who at least once was engaged in growing tomato seedlings encountered such a problem when the leaves turned purple. In fact, this is not such a big problem if it is eliminated in time. Timely help to the plant will not only save him, but also get a good harvest in the future. Practice shows that foliage is painted in this color because all the rules of planting were not followed.

Therefore, in order not to encounter such a problem, you must first learn how to plant tomatoes properly. And then, how to properly care for them. Without these two components it is impossible to get a beautiful, powerful, green seedlings.


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