Correct watering is an essential part of maintaining a healthy tomato plant. Too much or too little water will create difficult conditions for fruiting. Excessive water decreases air flow to the roots and tends to weigh down soil, making growth difficult for roots. Both problems make it difficult for water and nutrients to be moved throughout the plant. If left untreated, foliage and fruit production is generally stunted. Conversely, too little water, particularly during hot, dry periods, creates a stressful condition for the plant. If left uncorrected, fruit production is normally reduced or stopped altogether. Soil should be kept moist, but water should not be left standing for long periods.
There are several bacterial and fungal infections that, if left untreated, will hurt tomato production. Root rot is a bacterial infection that enters the plant through the roots. It is especially prevalent during periods of heavy rain. The bacteria turns root tissue into a useless gray mush, making it unable to transport nutrients through the rest of the plant. Without nutrients, foliage dies off and fruit production ends. Nematodes, caterpillars and, on a smaller level, aphids and spider mites will attack and weaken the plant, leaving it open to more diseases. Though these pests aren't usually directly responsible for fruit production problems, the ensuing damage and illness frequently influences both.
Cherokee purple tomatoes require nutrient-rich, properly draining soil to do well. Loam soil is the best choice for tomatoes, as it is lightweight and provides good drainage. For areas with heavier clay-based soil, a thorough mix-in of well decomposed compost helps correct the soil condition. This treatment also aids in correcting pH and nutrient deficiencies. Growers should plant tomatoes in areas with partial to full sun exposure after the risk of frost has passed. Fruiting is often affected if any of these conditions are not met.
Stress is a general term for any condition, problem or event that creates a less-than-perfect growing arrangement. Transplantation, even when done under the best conditions, often causes stress in tomato plants. This will likely cause problems with foliage and occasionally with fruit production. Given some time, these conditions will most likely fix themselves. Though Cherokee purple tomatoes are full-sun plants, extended periods of heat, sun, or drought will reduce growth and fruiting.