The design question that will almost inevitably arise
in most garden situations is that which relates to the space between
the hedge or shrubs and trees that border a garden, and the ground
plain which takes up the majority of the area. This ground plain
usually comprises of a lawn, but an alternative material like a wooden
deck is often the desired option particularly in dry climates. Whether
a lawn, deck or some other material is chosen, the same question
remains - what is to be done in the foreground between it and the hedge
or shrubbery? This is where low or dwarf shrubs and bushes come in.
Low
shrubs can be classified as woody plants that cover the ground up to a
height of about 50cm or so. Their primary function visually, is to fill
up the space at this low but not necessarily prostrate height. In this
way they cover and hopefully beautify the space between the ground and
the point where the larger shrubs or hedging plants start to grow. They
should be considered before other design options such as herbaceous and
flowering perennials for a number of reasons.
Dwarf bushes
provide a low maintenance solution. While herbaceous plants, whether
annual or perennial, require constant attention, such as very frequent
clipping and pruning, small shrubs generally need only be pruned once
or twice a year if at all.
In this way, they serve as a stable
element in the garden. Flower beds by their very nature are constantly
changing, with plants being cut down, divided and re-planted, or
replaced altogether. There is a place for this of course in the garden,
and indeed large areas taken up by low maintenance dwarf bushes
actually free up valuable time for the proper attention that herbaceous
beds require.
Many dwarf shrubs are modest in their water
requirements and some can even be defined as water conserving plants.
This means that in a typically Mediterranean climate, with an annual
rain fall of say 450mm, they can be grown by consuming about 200-300mm
of irrigation water per year, i.e. 200-300 liters per square meter. By
way of comparison, a perennial bed will need at least 500mm per year,
while annuals often gulp up over 1,000 mm, or 1 cubic meter per square
meter per year.
By reducing the amount of flowers and
concentrating them in smaller, well defined groups in the garden, the
opportunity arises of designing flower beds that function as focal
points and not just as smatterings of colour in the garden. The
creation of focal points should be one of the compositional aims of the
design.
So if you're being overwhelmed by the amount of work
needed to maintain your flower beds, or herbaceous borders, then you
may wish to consider redesigning some of them by replacing the
herbaceous material with low, shrubs and bushes. Here are some examples
that I recommend from over 20 years experience gardening in Israel.
Pittosporum tobira "Wheelers Dwarf"
Coprosma repens - There are a number of different varieties including dark-leaved plants and those with variegated foliage.
Melaleuca sp."Green Dome"
Ficus sp."Green Island"
Asparagus densiflorus "Sprengeri" group
Juniperus sp. - Low growing varieties
In addition, a number
of shrubs which grow vertically, such as Nandina domestica, or Junipers
like the upright variety "Kaizuka", can be judiciously placed for
accent and emphasis.
I've
been gardening in a professional capacity since 1984. I am the former
head gardener of the Jerusalem Botanical Garden, but now concentrate on
building gardens for private home owners. I also teach horticulture to
students on training courses. I'd love to share my knowledge and
experience with you.