Juvenility is a developmental stage in seedling plants where they are unable to induce flowers. The length of the juvenile period varies between plant species, from as short as 20-30 days in roses to 4-8 years in apples. During juvenility, seedling plants exhibit characteristics like vigorous leaf growth, whip-like shoot growth, and the presence of thorns in some species. Environmental factors like temperature, photoperiod, light intensity and quality, and nutrient and moisture availability can influence the transition out of juvenility and induce flowering.