This study aimed to identify the optimal storage and germination conditions for producing sprouts from immature bulbils of the Korean garlic cultivar ‘Hongsan’. It also evaluated the effects of LED light quality on sprout growth and compared the functional compound contents across different plant parts. Germination trials indicated that storing bulbils at 4°C for at least 64 days, followed by germination at 10-20°C, yielded the best results. Under mixed LED light treatments (Red:Blue:White), a red-dominant ratio of 4:1:0 significantly enhanced both shoot and root elongation, while germination in darkness resulted in the highest fresh and dry weights. Among the plant parts, sprouted bulbils had the highest alliin content (3,711 mg/100 g) and contained greater levels of fructose and glucose compared to cloves. Conversely, cloves had the highest fructan content, and leaves exhibited the highest total polyphenol content. These findings underscore the importance of combining proper storage and light quality for efficient sprout production from bulbils and highlight the potential of sprouted bulbils as functional food materials.