Some studies show that red plastic mulch hastens ripening.
It is possible too much nitrogen fertilizer as been applied; reduce fertilizer application, especially nitrogen.
It’s okay to prune off some stems and small fruit. This may not hasten ripening but will increase stability of top-heavy vines. To prevent sunscald, do not remove foliage that shades the fruit.
Fruits picked and brought indoors at the first sign of color often show full color and ripeness before those left on the vine. Flavor and quality are not diminished.
Choose varieties that mature quickly for early harvest. Start tomato, melon, and squash seed indoors to shorten the time to harvest.
Warm weather in late summer is needed to ripen late season varieties. When ripening begins in warm weather, it progresses rapidly.
The following Web link has information about growing tomatoes that may interest you:
Tomatoes
