I had the same problem until I started buzzing the base of the flowers with my electric toothbrush.

Brandywines seem to need a little help releasing their pollen, and you aren't getting pollination so the flowers fall off.

Agree with Patty... Sounds like blossom drop. That can happen due to temperatures that are either too cool or too hot or too high humidity. Certain tomato varieties like the Brandywines, seem more sensitive to these conditions. Definitely try flicking, shaking or buzzing the blossoms when you see them almost ready to open or when just opening to try to get some pollination going.

Buzzing with an electric toothbrush didn't work. I've just been out on my balcony and the heads have started to fall off again. I buzzed them about twice a day on July 16 and for the next few days, and then once a day for a couple of days more. I did it very gently, but a few days ago I saw the breaks starting and yesterday they flower heads started falling off.

Post question on Tomato Forum for additonal options. It certainly appears the the above comments should have assisted in pollenation. I'm growing a several tomato plants in house this winter and experienced blossom drop until I assisted the plants with virbration. Now have my cherry tomatoes starting to grow.

I'm a hydro grower and it sounds like your tomatoes need extra calcium!

There is something called "Blossom End Drop" which is similar and that too is caused by a lack of calcium.

Hope that helps.

^ What he said. This is a frequent occurrence for people growing tomatoes in-ground here in s. Oregon. Usually if you're using potted soils, it's not an issue unless you're re-using the soil each year, or the soil you had was lacking in calcium to begin with. Depending on the soil's molecular make up, you sometimes add lime to it (to make it simple, lime bonds with excess Hydrogen floating around, makes Calcium, magnesium, and turns the rest to water and carbon dioxide). Or add things like egg shell / oyster shell to a compost pile if you're using one. Takes awhile to break down, but does eventually.

My tomato plant is very healthy and i have alot of flowers on it but the stem is breaking off 1/8 of an inch what am i doing wrong it is a patio plant

Same problem...not blossom drop, but blossom stem breaking. I have a product called "Foli-Cal", which is 10% Calcium Concentrate. It directs to dilute and use as a spray on folage or to dilute and use on the turf. Seems like I sprayed it last year (summer 2012) on both tomatoes and Meyer lemon as recommended at the nursery, and the folage wilted. Has anyone used this successfully? Which application or both? The blossoms fall off when I try to nudge them. Thanks

what to do if my tomatoe plants grow flowers early