Q.Why my heirloom tomatoes are not turning red?
I planted 6 heirloom tomatoes in the end of May. Four of them are really full of tomatoes, two not any, and the ones that have fruit are nice size but very slow in turning red, two per week, for the last 3 weeks. They get full sun for at least 6 hours. I fertilize every 4 weeks. Perhaps too little?
Certified GKH Gardening Expert
Normally if tomatoes will not ripen, it is an issue with the temperatures and time. Tomatoes need heat to ripen (though not too high) well and if they don't get that, they may stay green for some time. If it has been cooler than normal in your region, this is likely the reason behind the green tomatoes. However, with a little time and patience, they will eventually begin to turn color and you will be able to enjoy them. If your tomatoes are getting quite large and you are afraid they will either die or you simply cannot wait, then you can ripen them yourself. Here is more info: https://www.gardeningknowhow.com/edible/vegetables/tomato/how-to-turn-green-tomatoes-red-how-to-store-tomatoes-in-the-fall.htm