Biennials in zone 5 thrive in cooler climates, taking two growing seasons to complete their life cycle. In the first year, they focus on developing roots and foliage, then bloom and produce seeds in the second year before dying off. Popular biennials like foxgloves, hollyhocks, and sweet William are commonly grown in zone 5 gardens.

These plants are valued for their vibrant blooms, often appearing in early summer, and they help fill gaps between annuals and perennials. Proper winter care, like mulching, is essential to protect them during their dormant first year.