When evaluating Sencha, prioritize leaf appearance, color, and aroma. High-quality Sencha should have needle-like, uniform leaves with a vibrant deep green color, indicating proper steaming (Asamushi or Fukamushi) and freshness. Avoid brownish leaves which suggest oxidation. The aroma should be fresh, grassy, and slightly oceanic. For B2B procurement, request the harvest season (First Flush/Shincha is premium) and the cultivar type (Yabukita is the industry standard) to ensure consistency in flavor profile.