In nature, bogs occur wherever shallow water provides an ideal home for plants that thrive in water but do not live submerged. Bog plants may include cattails, calla lilies or floating plants such as lotus. You can incorporate these plants into a garden pond as marginals, or you let them take center stage by building a bog for them to grow in. Because a bog does not require water pumps or filters, building a bog in which plants such as these can thrive is easier than building a garden pond.
Dig a hole for your bog approximately 12 inches deep and as wide as you wish the bog to be.
Cover the bottom of the hole for your bog with sand to a depth of 1 inch.
Spread out your pond liner across the bottom of the bog. Pull the liner up over the sides of the bog so that the entire bog is covered by the liner.
Smooth out the liner around the bottom and sides so it has no wrinkles or air bubbles.
Cut drainage holes in the plastic sheeting approximately 6 inches from the bottom of the hole and all the way around the bog.
Place sod in the bottom of the bog grass-side down to assist with drainage.
Mix garden soil and peat moss in equal portions.
Overfill the bog with the garden soil and peat moss mixture to create a raised bed over the bog.
Fill the bog with water until the soil is uniformly saturated.
Plant lotus plants inside the bog region. Soften the borders of the bog by planting with plants that thrive in bog conditions and on dry ground, such as hostas and irises.