Keep greenhouse temperatures warm, ideally around 70–75°F during the day and 60–65°F at night
Maintain good light exposure by removing excess shading and keeping plants well spaced
Reduce watering slightly once fruits are mature to encourage ripening
Avoid overfertilizing with nitrogen; use a fertilizer higher in potassium and phosphorus if needed
Remove new flowers and small fruit so the plant focuses energy on existing tomatoes
Prune excess foliage to improve airflow and light penetration
Harvest mature green tomatoes and ripen them indoors if plants are overloaded or season is ending
Keep humidity moderate to prevent disease and support healthy ripening
Check regularly for pests and disease that can slow ripening
Use ethylene-producing fruits like bananas or apples near harvested tomatoes for indoor ripening
Pick tomatoes when they are full-sized and starting to show color break for best ripening results