I have green tomato's but it looks like their rotting before they have ripened?

Question

I have green tomato's but it looks like their rotting before they have ripened?

Answer 1

add some fertilizer.

Answer 2

Is it possible they are getting too much water?

Blossom end rot can also affect the fruit. This is a round, brown, indented spot on the bottom of the tomato. It is caused by either uneven watering or a lack of calcium in the soil.

Here is a site that talks about this rot,  It has a picture so you can see if that is what yours looks like

http://www.ext.vt.edu/pubs/plantdiseasef...

What kind of tomato is it?  I have some that are green to yellow when they are ripe.

Here are some sites that might help out:

http://www.geocities.com/green_cache/tom...

http://www.helpfulgardener.com/vegetable...

http://www.gardenersnet.com/vegetable/to...