In the spring they begin growing again, then later flower and produce seeds. Parsley and fennel are examples of biennial herbs that need a cold period. Garlic, too, requires vernalization in order ...

Learn about the three main weed classifications—annual, biennial, and perennial—and how they impact garden management.

The lifespan of a hollyhock flower is two years as hollyhocks are biennial plants. 'During the first year, the biennial plant typically produces a rosette of leaves close to the ground and stores ...

Try it on summer bedding plants and annual and biennial flowers, such as calendula, godetia and pansies. Many plants concentrate their energy in a single tip bud, while other buds along the stem ...