Choose your plants
In winter, do soil preparation and put in paths or other hard landscaping, then start planting in spring as moisture-loving plants become available. April is the best time, though pot-grown plants can be added all through the summer even when they are in flower.
For a wild and natural look: choose native moisture-loving species and their close cultivated relatives such as lythrum, lysimachia, epilobium, marsh marigold, Equisetum scirpoides, flag iris, gunnera and bogbean.
For a cultivated/glamorous look: choose monarda, sanguisorba (pink, fluffy bottlebrush flowers), hosta, astilbe, rheum, Primula rosea, P denticulata and candelabra primulas such as P japonica and P pulverulenta.
For partial shade: choose hosta, primrose and ferns, especially ostrich fern and soleirolia (the ground-hugging, mind-your-own-business plant).
Winter interest
Most bog gardens look their best from mid- to late summer so in winter, when the perennials have died down, you need to add visual interest with a sculpture, gnarled tree stump or natural-looking ornaments. There are plants for winter effect: if space permits, plant red-, orange- or yellow-stemmed shrubby willows and either coppice them every two to three years in spring, or grow one as a tree and pollard (prune) it regularly so it has a trunk topped with a spray of young shoots.
Hydrangeas will thrive in the damp area around the bog garden. Their late flowers will dry out naturally on the plant and last well into autumn.
Make full use of early spring species such as marsh marigold (and its cultivated varieties with double flowers), early primulas and peltiphyllum (pink flowers in spring before the leaves appear and in autumn, large saucers on stick-shaped leaves that take on colourful tints).