Identifying two main groups of perennials

Herbaceous Perennials

Herbaceous perennials are those with more or less soft, succulent stems.

In temperate climates the tops die after a season of vegetative growth, sometimes dying down because of drought, sometimes killed by frost or freezing, sometimes dying simply after effect of flowering, fruiting, and producing seeds.

Their crowns, however, and often their roots, remain alive and produce new stems and tops another season upon the appearance of conditions favorable for growth. In other words, their tops are annual, though their below - ground parts are perennials.

Examples of this group are; Asparagus, rhubarb, Oriental puppy (Papaver orientale), bleeding heart (Dicentra spectabilis), and many varieties of Phlox.

In tropic and subtropics climate the tops of herbaceous perennials may likewise die down, due to natural causes leading to a period of rest following flowering and seeding, or they may remain alive for long periods.

Most of the so-called "bulbous plants", using the term in its broad sense, are to be classed as herbaceous perennials.

 

 

Woody Perennials

Though the stems of many herbaceous perennials and likewise of many annuals and biennials, become somewhat woody and those of many woody perennials are rather soft, there is seldom any great difficulty in distinguishing between them. The difference, however, is in hardness, in toughness of the woody fiber, rather than in the size or age that the plant attain.

In the case of trees, shrubs, or vines that survive for a number of years there is never a question as to how they should be classified.

Some plants, however, growing as woody perennials in their growing habitat, take on the characteristics of herbaceous perennials when grown where their tops freeze to the ground in the winter but where the temperature is not enough to destroy their roots.

 

Plant growth forms

One way in classifying plants is its stands in relation to the ground. Some of the types of growth forms of flowering plants are as follows:

Erect

An erect stem has no support, it stands upright at 90-degree angle to the ground level. These plants have strong stems and stiff branches which can withstand strong wind and other adverse condition.

Decumbent

Plants under this form are extremely inclined, with the tips raised.

Creeping or repent

These plants crawls on the ground, produces adventitious roots at specific points on the stem. Stems that grow horizontally in this fashion are called stolons.

Climbing

These are vines that needs support to stand its own. If there is no support their tendency is to creep on the ground. There are three general modes of climbing; Twiners, are climbing plants that simply wrap their stingy stems around a support, another modes is the climber which develops its cylindrical structures called tendrils that are used to coil around the support on physical contact, and the other mode of climbing is by adventitious roots formed on aerial parts of the plants.

Other operational plant classifications

Flowering plants may be used in a variety of other ways, both indoors and outdoors. They are classified according to the following uses:

Bedding plants

These are annual plants raised for planting outdoors in flower beds. Started from seed indoors in the off-season and transplanted later in the growing season.

Examples includes Petunia (Petunia spp.), Zinnia (Zinnia elegans), Pansy (Viola tricolor), and Marigold (Tagetes spp.).

 

Hanging plants

These are hanging basket plants either annual or perennial, flowering or foliage, raised in decorative containers and hung by equally elegant ropes from the ceiling in the patio, in the doorway area, or from decorative plant poles.

Examples are Geranium (Geranium spp.), and Spider plant (Chlorophytum comosum).

 

House plants

These plants are adapted to indoor conditions. They are grown in containers, usually slow growing, and may be flowering or foliage plants.

Examples are Sansevieria (Sansevieria spp.) Indian Rubber plant (Ficus elastica), Philodendron (Philodendron spp.), Medicine plant (Aloe vera), and Pothos (Scindapus aureus).