These tomato flowers are self pollinating, but they need to be vibrated every day as they are open to ensure they become pollinated. After the flowers die off, those that have been pollinated will start to form in the remaining stem of the flower. When the tomatoes get to be about one inch in diameter, pick off the smaller fruit and leave only three on each stem. This helps the tomatoes on the stem get larger and more flavorful. Tomatoes are happiest at daytime temperatures of 250C and nighttime temperatures of 180C. Over 320C and there is poor fruit set.
Tomato flavors are from several things.
For one thing, the type of tomato plant will determine a lot of the flavor. Most modern hybrid plants are designed to look nice and keep well, but not necessarily for flavor. Some of the better flavored tomatoes are the heirloom varieties, or old fashioned varieties. There are also many varieties worldwide, and these international varieties often have high flavor. Flavor will be improved when the tomatoes are allowed to ripen on the vine.