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Date: Fri 10-May-1996

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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.)

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