While there isn’t much you can do to resolve that situation, it isn’t anything that you need to worry about. Naturally, the side of the leaf that is facing the soil isn’t going to get as much sunlight as the top of the leaf. If only the underside of the leaves is turning yellow, or the yellowing is only affecting one side of the tomato plant, the cause may simply be a lack of sunlight. Tomato plants shouldn’t be watered more often than two times per week, but you should always strive for deep watering to allow your tomato plant the opportunity to absorb as many nutrients as possible. Tomato seedlings do fine with just an inch of water per week at the beginning of the season and two inches once they begin to produce fruit. While it may be tempting to go out in the garden with a watering can every day, this isn’t the best course of action when it comes to caring for tomato plants. Too much or Too Little Watering Can Cause Yellow Leavesīalance is a key factor when watering tomato plants, as overdoing or underdoing the watering will result in the plant showing signs of nutrient deficiencies, such as yellowing leaves. Of course, more nitrogen won’t make a difference if the plant needs more iron. While you can usually resolve this issue by switching to high nitrogen fertilizer, you should conduct a test on a soil sample to determine exactly which nutrient, if any, that the soil is lacking. While lack of adequate nitrogen is the most likely culprit, especially if the entire leaf is turning yellow, newly sprouted leaves are more likely to be deprived of calcium and iron. Tomato plants feed heavily on the nutrients in the soil, which can easily lead to deficiencies. Nutrient Deficiencies Can Cause Leaves to Turn YellowĪlthough tomatoes are one of the most popular crops to grow, they are very high maintenance. However, yellow leaves are sometimes a normal part of development for tomato plants. Too little or too much watering, lack of sunlight, and diseases can also cause yellow leaves.
T omato seedling leaves turning yellow may be due to a lack of sufficient calcium and iron. While there are several reasons for a tomato seedling’s leaves to turn yellow, this seems to be a common scenario that can be resolved.įortunately, you may have caught the problem in time, if the rest of the plant appears to be in good overall health.Ī tomato plant with yellowing leaves can usually be saved with just a few simple tweaks to your gardening technique. Is that good or bad? What causes the leaves to be yellow? How do you fix it? So, you have finally decided to move forward with growing a tomato garden, but there’s one tiny problem: the tomato seedling has leaves that are starting to turn yellow.
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