It's a pollination issue. You're plants are likely not producing any or enough male blossoms. My two zucchinis produce almost no male flowers at all. Luckily I have a Butterstick summer squash nearby that does the job. You're not the first to have this problem. There's been at least a couple of other threads over this same problem.

the blossom ends look rotten ... how can lack of pollination cause this? i'm not arguing with you, just wanting to learn ... i really thought it was overwatering ...

thank you .... darlene

looks like my pics were reduced, finally, after playing with them for another hour

It can happen due to lack of or partial pollination, But if I read your post correctly, you got good zukes from those plants early on. If that is the case it will probably not be a pollination problem. Squash plants tend to produce fruits like this when under stress. Blossom end rot is a stress induced factor. As the plants age, they are less able to cope and more likely to have disease and insect damage rendering them incapable of producing goog fruits. Like people they have a definite lifespan, which can be shortened, but not much you can do to lenghten it.

farmerdilla, i do have a lot of zuchs, however, there were five or six like the ones i posted ... two with actual soft, rotting ends ... if this is ber, how can i alleviate it? less watering? spraying with *something*?

all the rest of my zucchinis are wonderful ... they are not *old* plants, we planted late (early june) and they were not huge when planted ....

thank you for all help -- as much as i complain, we really do love zucchini -- last night i grilled shrimp kabobs with zucc and green peppers and our very small onions ... yummm .... we love our zucchinis ...

I f you are getting good zukes, it is pretty normal to get a few like you posted. It is rare that I don't have abortions and partial abortions. The plant plant knows how many it can support and will abort the rest. That is true of cukes and melons as well. Nothing to panic about. Just relax and enjoy natures bounty.
{{gwi:63162}}

love your garden pics ... mine are on picasa but am not sure how to link to it ....

darlene, who will not not worry as much (nor water as much) about her zucchini ... thank you ...

Looking for help with all squash plants. All the blossoms are rotting right at the stem and i dont know what to do.