Patti Moreno shows you how she grows her night shade plants, heirloom tomatoes and heirloom potatoes. Visit http://www.gardengirltv.com This Video is availab… Video Rating: 4 / 5 Question by rdegar72: Does anyone know why tomato plant leaves turn dark? They have been producing tomatoes for about a month but have slowed up the last week or two. Also, I have another type of tomato plant in the same area and they are doing fine. Their leaves are green. Thanks. Best answer: Answer by lilwundaIt could be late blight. If it hasn’t effected the stem of… Read Article →