Rudbeckia, one of the perennial daisies

Perennial Daisies

Perennial Daisies are daisies that survive over many growing seasons. The Latin word per, means “through”, and annus, means “year”, so a daisy that lives for more than two years.

The top part of the daisy plant dies back each winter and grows back the following spring from the same root system.
These daisy plants are often called ‘herbaceous’ perennials, which simply means that they ‘disappear’ in winter. Herbaceous plants are also called tender perennials.

There are also many perennial daisy plants that don’t disappear and  keep their leaves throughout the year. These are the ‘non-herbaceous’ or evergreen perennial daisies. These plants add all year round value to your border, even when the flowers aren’t present until the spring/summer.
Examples of this are Coreopsis and Shasta Daisies.

Technically trees and shrubs are also perennial, but they have woody growth and are much less bushy, meaning: they have less branching.

A few examples of Perennial Daisies are Anthemis, Echinacea and Echinops.

If you are planning to raise your perennial daisies from seed it is important to remember that these plants usually don’t flower until the spring and summer of the second year. Most of these wonderful daisies are well worth the wait and can be enjoyed for a long time afterwards.
An example of a daisy that won’t flower from seed in the first year is the wellknown Ox-Eyed Daisy.
Most perennials benefit from division every two to three years and some might even need to be replaced. This is needed when the plants start to look less healthy and have lost some of their vigour. The perennial daisies can be divided more often for the purpose of creating more plants. This is called propagation by division.
Please note:
If a daisy is annual or perennial does of course also depend on where you live on this planet. We all have our own climate and the growing conditions can differ substantially in different places. For instance it makes quite a difference to your daisy if you live high in the mountains or at a windy coast or even in the dessert. So, the information given here is quite general.
For instance if you live in the southern part of the United States where it is much warmer you will experience a longer growing season compared to when you live in the north.
For example: a Black-Eyed Susan would behave as an annual daisy if grown in Louisiana; whereas, if grown in Ohio, a Black-Eyed Susan would behave as a perennial daisy. Luckily their eyes will be black in both parts. 
The growing conditions in certain places can even be different from year to year. Often we say: Oh, hasn’t it been a mild winter, we’ve hardly had any frost this year, whereas the year before it could have been freezing for prolonged periods of time during the winter. In a very mild winter some tender plants that usually won’t survive might still be there to enjoy for another year. That means that your annual is suddenly behaving like a perennial!

The local climate also determines whether plants are treated as shrubs or perennials. In colder temperate climates, shrubby varieties are cut to the ground to protect them from winter frosts. In warmer climates, perennials grow continuously and grow into shrubs.

Perennial plants can be short-lived (only a few years) or they can be long-lived, as are some woody plants like trees.