Mega blooms are to some degree hereditary. They occur when the plants are young and the temperatures are cool. So, these are most times on a plants first few fruits. Some tomatoes varieties are more prone to having fruit with mega blooms than others. Fruits from mega blooms are what grow those giant tomatoes everyone loves.
Since these tomatoes are fused, it is possible for each section to have seeds from different pollen donors. It is also possible for a normal tomato to have seed from different donors in each of it's locales.
With that being said, I would think that it would be just fine to save seed from a fused tomato. Since these are early fruits, there is less chance of a bee cross pollinating the fruit. The bees are in short supply at this time of the year, so most pollination is done normally.
Some people choose to save seed from each tomato separately others like to mix several fruits seeds together. I myself like to mix them. That way, if there has been a cross it is more likely that the next seed out of the pack will be one that will grow true to form.
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~ Patti ~
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