When sourcing seeds, the most critical factor is the Germination Rate, which should ideally be above 85-90% for most commercial crops. Buyers must request a recent Seed Analysis Certificate (SAC) or a Phytosanitary Certificate to verify the seed's purity (absence of weed seeds and inert matter) and moisture content. For high-value crops, ensure the seeds are Non-GMO or Organic certified (e.g., USDA Organic or EU Organic) if your target market demands it. Additionally, check for hybrid vigor (F1 hybrids) if you require high yields and disease resistance, or heirloom varieties for niche organic markets.