Most tomatoes are self pollinating, meaning the flower pollinates itself. If they cross pollinate, you will not see the results this year, only if you save the seeds and grow them again next year. Growing multiple varieties in close quarters is just fine unless you plan to save seed. The biggest problem in growing them so close together is lack of air circulation which can lead to increased danger of diseases.

Sandy

Sandy,

Thanks for this reply. Yes, I was hoping to save seeds and even trade them but perhaps I had better wait until next year.

How far apart should I keep the different varieties if I want to save seed?

thanks again,
Dave

Hi Dave,

The FAQ (Frequently Asked Questions) link at the top of the growing tomatoes forum has a good article on avoiding cross-pollinating your tomatoes.

If you wish to save seeds this year, you can "bag" a few blossoms to avoid insect pollination.

Hope that helps.

Betsy

Here is a link that might be useful: How Do I Prevent Tomatoes from Cross-pollinating?