Simply stated, organic produce and other ingredients are grown without the use of pesticides, synthetic fertilizers, sewage sludge, genetically modified organisms, or ionizing radiation. Animals that produce meat, poultry, eggs, and dairy products do not take antibiotics or growth hormones.
That may be the case, however the sellers on Listia aren't bound by the USDA or sell Certified organic seeds, unless they are seeds still in pouches from seed companies, and not from their gardens. Some do sell GMO seeds that they have organically grown.