Learning to avoid Tomato Blossom Drop Syndrome (TBDS) is like learning the Zen of perfect balance, or like trying to discover Aristotle's golden mean. Blossom's sometimes drop if daytime temperatures reach into the 90s, or if nighttime temperatures drop into the low 50s. We get both. They can drop, too, from their roots wanting more moisture between watering. It can also be due to a severe lack of humidity in the air. Or maybe the flowers weren't visited by pollinating insects. No sex. No fruit. Sometimes it's because there's already too much fruit setting on the plant. Blossoms will drop, too, if the plant has been attacked by insects. Or maybe the soil needs some good organic fertilizer. Or maybe you've shocked it from too much fertilizer. Then again, maybe the plant hasn't quite made the adjustment between the climate it received as a young sprout and the climate it endures now. Where is the perfect balance?
This weekend is predicting higher temperatures again, so be sure to keep an eye on your tomatoes. They, like almost all edible nightshades, like deep watering. And especially watch your container tomatoes; the winds we've been having dry out those ceramic pots, especially the unglazed terracotta.