If your seeds came from a Big Zac, the resulting seedlings will display a wide array of the parent characteristics. If you're lucky, one or several seedlings *may* produce what you're looking for.

my only real hope for continuing to grow these giant tomatoes is to plant the next generation of seeds.

Well, that depends how many seeds you have. It also depends what your object is, in growing Big Zac.

Perhaps you intend to plant all the seeds at once, in a go-for-broke attempt to win NZ's giant tomato contest (if there is one).

Or perhaps you simply assume that all your seeds must be planted this year or they'll "expire." Some folks aren't aware that tomato seeds, if kept from high temperatures, can last a dozen years or more.

Then again, this is mid-summer in the Southern Hemisphere, so perhaps you've planted all your Big Zac seeds already....

Thanks. I only had one small pack. I did hold some back and that should get me another year at least. But I've heard so much about these that I was hoping to hold on to them. Guess I'll try planting some of the seeds next year and see what happens :-)