Date: Fri 10-May-1996
Date: Fri 10-May-1996
Publication: Bee
Author: SHANNO
Illustration: C
Quick Words:
Gardener-rock-garden-Bleach
Full Text:
(`Burb Gardening column on rock garden planning, 5/10/96)
Suburban Gardener-
A Rock Garden & Herbs
By Anthony C. Bleach
Author's Note: The following is based on a paper written by Jean Zajac, a
student in our Landscaping Small Properties course. I want to share it with
you this week, as I thought it has a conciseness and clarity rare in such
descriptions...
The area I chose to design a rock garden for is my backyard, alongside an
existing patio. The plan is to combine a stone retaining wall, which will also
serve as a planted wall, with a small rock garden. The area is approximately
16 by 16 feet with a north-facing slope. The planted wall will contain mostly
herbs, as it is close to the house.
After building the stone wall, the site will need to be excavated to a depth
of 12 to 18 inches. Since this area for the most part is a consistent slope,
some shape will be given to the subsoil to give it a more rugged look with
some shallow spots and some bumpy areas.
Next, a mixture of fifty percent sand and rough gravel and fifty percent loam
and humus is laid down to within three inches of ground level. The top three
inches of pea gravel and sand will provide good drainage and will prevent
moisture collecting around the crowns of the plants. At the same time, it will
conserve moisture during dry spells. As the plants' roots grow, they will
search through the pea gravel to find the sand and humus below.
Only three-quarters of the surface material is spread over the surface prior
to placing the rocks. The remainder will be spread over the site after the
rocks have been spaced so some spaces will be filled in if necessary.
In placing the stones, they should give the appearance of a
naturally-occurring part of a slope. Stratum line should face in the same
direction as they do in nature. The rocks and boulders chosen should be
naturally occurring in the area so as to add to the natural look of the rock
garden. In this case all the rocks should need to be brought in, if not an
existing outcrop.
When placing the rock, some are put together to create deep and narrow
crevices for plantings and others are spaced further apart for larger planting
beds and spreading plants and dwarf shrubs.
Adequate drainage, proper placement of rocks and carefully prepared soil
mixtures are the most important aspects of a successful rock garden. In
choosing plants and flowers, those with soft and gentle shades tend to blend
with weathered rock. I have also taken into account ease of care,
dependability and tried to choose plants that will provide the garden with
year-round attractiveness.
Maintenance includes watering, weeding and replacing top dressing as regular
chores. Renew the edging if necessary, but I have tried to eliminate that by
gradually combining the lawn and garden with low creepers rather than a sharp
contrast between garden and lawn.
The planted wall will consist mainly of herbs. Some of the requirements of a
planted wall are excellent drainage, air circulation, cool sheltered pockets
for roots, reflection of sunlight and retention of its warmth.
Choosing small plants with good roots and using compact varieties of things
like eight-inch Silver Mound Artemesia or four-inch perennial Roman Chamomile
when possible is helpful. Some of these would include purple sage, parsley,
oregano, thyme, scented geranium and chives.
The best way to plant a wall is at the same time as installation. Briefly, the
majority of stone used will come from the property. Water weekly and remove
weeds promptly.
Clipping back stems one-half to one-third at least once per season will
promote abundant, graceful growth. Little fertilizing is recommended because
this will cause the roots of the plants to extend further into the wall.
Jean Zajac works at Millane's Garden Center, Cromwell.
(Anthony C. Bleach coordinates the horticulture degree program at Naugatuck
Valley Community-Technical College in Waterbury.)
