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If you seek to plant bog plants in your rock garden, it is best to arrange one or more bays that have peat lying on a level surface, as peat is unstable if sloping. You can create an angle in the general structure by adding a line of small rock pieces, so that a large pocket at the base level is created.  You can than lay peat on the not too porous subsoil.

The trick with bog plants is that they demand a waterlogged home. If you incorporate a wall or water fountain into your rock garden, bog plants will thrive at the edge of the fountain, where the peat has contact with the water. After all the rocks have been placed, and the view is approved, you can begin to fill in the holes and pockets with compost, being sure the soil gets down into the lowest levels!

After your rock garden has experienced its first heavy rain, you will want to go over the structure, replacing lost soil or checking for places where the soil sunk in. If you have used brick waste as an alternative to rock, it can be a little tricky to disguise them. With a little creativity you can create wonderful results though!

With bricks, you will have large masses that are cemented together, that create an artificial appearance. The long joints of these pieces need to be placed horizontally, or at a slight tilt. It is always tempting to place them so that their component bricks stand on end, but this creates a bad arrangement.

You do not need to outline the back margin of the bank with rocks. The soil there will usually run off into the level of the ground. When the structure of soil and rock is finished the gravel floor of the rock garden may be laid in the way directed for path making.
Water-worn piece of rock should be avoided, as they often add a grotesque appearance. You can use a few rounded pebbles at the margin of a larger structure, as they represent an old water way, as well as helping to retain soil that washes down from higher points.

There are not practical directions for putting the plants into the rock structures. You will want to plant just as you would a flower bed or border, according to the correct seasons based on your locality. Certain plants for rock gardens do require less depth than plants placed in flower beds.

Be careful on the selection of plants for your rock garden, especially those being placed in special positions.  Smaller plants, like saxifrage, sempervivum, and sedum will thrive in small nooks and crannies. Some plants look best in the marginal spaces, being allowed to creep on to the gravel, creating a softer line where the rock and gravel meet.

Trailing plants will look best place at the top of a miniature precipice, where they can hang over, painting the surface in color. Tall plants belong in the higher levels, and all plants should be given adequate room to grow and expand. Plant your rock garden fully, allowing that all spaces to be filled when the plants are established.  Plants can be placed into ant chink or crevice, and should be, as they will do well when cared for.

Ferns are a wonderful accent for rock gardens, and will thrive in shady corners. There are so many different plant choices, but for the beginner, it is best to stick with the hardier plants. These are also the most beautiful normally. At the top most level, towards the place, plant small flowering deciduous and evergreen shrubs along with tall perennials like starwort and snapdragon.