The seed varieties you have obtained as “heirlooms” from heirloom or organic seed companies are “NOT” GMO seeds, even though they are officially “owned” by Monsanto. As far as we know, the only GMO vegetable seeds available for sale today are new hybrid varieties of zucchini and summer squash, so be sure you order these from certified organic suppliers.
Please understand that Monsanto only owns the trademark names for these “heirloom” varieties. This stretegic move holds two advantages for Monsanto:
1.) prevents new companies from naming new varieties with these or very similar names.
2.) it is an effort to stop lucrative sales by these other companies trying to leverage the heirloom name and consumer loyalty for those heirloom varieties.