You will likely know if watering is the culprit by assessing your watering habits. If underwatering is the problem, the leaves will begin to yellow from the edges, until the entire leaf drops off the plant. Underwatering can also cause the leaves to turn yellow after wilting. As the roots are damaged and there is less oxygen in the soil, there is less oxygen available to the leaves, causing them to turn yellow and drop off. The excess water in the soil can suffocate the roots and cause them to rot. In our efforts to keep the plants happy, gardeners may overdo it on the care front and give the plant far more water than it really needs in fear that the soil will dry out. Take a look at our total guide to watering tomato plants here. Watering is a practice many gardeners get wrong – sometimes by providing the plant with too little water, but often by providing too much. The most probable cause of yellowing leaves on tomato plants is incorrect watering. It is part of the development process that these leaves turn yellow and fall off and is absolutely noting to worry about. They are the first leaves to form when the seeds germinate but are not “true” leaves. These are the seed leaves (also called cotyledons). These are the seed leaves and should turn yellow and fall off. If the leaves below are turning yellow on your young tomato plants or seedlings, do not worry. Okay, let’s just cover this one first as it’s one of the most common worries for new tomato growers and shouldn’t be a worry at all. Identify the problem (if there is one at all), apply the fix, and your plants will be back to normal in no time. These seven issues are the most common reasons for tomato leaves turning yellow. Most often, the problem is an easy fix (like incorrect watering), or may not even be cause for alarm at all. However, yellow leaves on tomato plants are an incredibly common problem that countless tomato gardeners come across at some time over the growing period. Yellowing leaves tend to induce panic in tomato gardeners.Ī plant previously in good health turning from green to yellow causes alarm and results in frantic fixes that may do more harm than good.
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