jardim de terra húmida (úmida PT BR)
jardim (de terra húmida) ao lado de um lago
jardim (em terreno) pantanoso

Sem mais contexto...

http://www.bbc.co.uk/gardening/htbg2/flat/module4/bog_garden...
The big difference between a pond and a bog garden is a pond contains standing water while a bog garden is just wet ground, so the conditions suit different plants.

http://www.greenfingers.com/articledisplay.asp?id=239
Making a bog garden
Creating a bog garden makes it easier to keep foliage plants like hostas or ferns as well as other damp-lovers like primulas and astilbes looking their best without having to water each one by hand. The secret of a successful bog garden is that, although it appears to be connected to a pond, it is in fact separate and the pond water is kept away from the soil and vice versa. You can add a bog garden to one side of an existing pond, create a pond and bog garden at the same time or just have a bog garden on its own. It can be whatever size you like.

Sugestão.

Veja o link

http://www.pitcherplant.com/bog_making.html