Selecting the right seeds requires evaluating germination rates, purity, and variety stability. For commercial use, prioritize seeds with a germination rate of at least 85% and a purity level above 98%. Ensure the variety matches your end-use: African Marigolds (Tagetes erecta) are ideal for large, sturdy blooms and pigment extraction (lutein), while French Marigolds (Tagetes patula) are better for landscaping and pest control. Always request a recent seed testing report to verify the age of the seeds, as vigor declines significantly after one year.