Start pre-cultivating your Sungold F1 tomatoes in March, 8-10 weeks before replanting outdoors. Keep the cultivation moist, preferably covering it with plastic or using a mini greenhouse. Make sure to keep a temperature of 18-21°C. Once the shoots appear, place them in a bright, cooler area and use additional lighting in darker months. Then, when the plants can be handled, transplant 1 per pot of fertilised soil and transplant them gradually. When the night temperature is minimum 8°C you can replant your tomatoes outside.