January 2020 - 28
VARIETY INFORMATION
Shrubs are Perennials Too
Consider growing shrubs alongside your perennial programs.
BY PAUL PILON
O
ver the past several years, many nurseries and greenhouses have
added perennials into their product lines. However, there have been
fewer nurseries adding annuals or greenhouses adding woody
ornamentals to their product offerings. In this article, I'd like to focus on
how traditional perennial growers and greenhouses could easily add shrubs
into their programs; after all, shrubs are perennials too.
Before looking at how to add shrubs into an annual or perennial program,
let's quickly look at the differences between herbaceous perennials and
shrubs. Herbaceous perennials are plants that complete their life cycles
in two or more years and typically lose their above-ground foliage in the
winter. Shrubs, often referred to as woody ornamentals, are actually pretty
similar to herbaceous perennials except they retain their wood stems during
the winter.
I suspect many growers have this idea that shrubs have very long grow
times and often require two or more years for plants to reach a marketable
size. Although this may be true with some shrubs, many can be grown in
one year or less much like the majority of the perennials growers produce.
GETTING STARTED
Several shrubs are best to grow like a traditional perennial. This entails
planting them in the summer or fall, over wintering and flushing them to a
marketable size in the spring. The main purpose for starting certain shrubs
the year before they are to be sold is to allow them time to bulk up. It's also
not uncommon to plant in the late spring or early summer the year before
the plants are to be sold when growing shrubs with slow growth rates or
when producing them in large container sizes.
The other approach that works with numerous shrubs is to quick crop
them or to plant them during the late winter or early spring the same
season they will be sold. This option usually required an older, larger and
more expensive liner, but greatly decreases production times, maintenance
costs and decreases the risk of overwintering losses.
28 JANUARY 2020 GPNMAG.COM
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January 2020
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