Gardens
To mark National Gardening Week, RHS expert Guy Barter explains how to establish a bog garden. By Hannah Stephenson
Expert advice on how to create a bog garden
Fed up with the incessant rain? National Gardening Week has arrived – a week designed to encourage us all to get outdoors and embrace all things plants and horticulture – but if the drizzle and dark clouds are putting a dampener on things, it might be time for a new approach.
Instead of letting the wet weather get you down, why not go with the flow and create your own bog garden? It’s a particularly good idea if you want to add an informal edge to an existing pond, or cultivate a permanently waterlogged dip in your garden.
There are many plants which will thrive happily in constantly moist soil and bog gardens are also a magnet for an array of wildlife, including frogs, birds and beneficial insects.
Guy Barter, RHS chief horticulturist, says: “If there are areas where the rain lingers, these might be a good spot for a damp garden using plants that, unlike most, don’t mind periods of wet roots and will put up with short periods of drier soil in the peak of summer while thriving on good moisture.
“You might need to have a plastic or rubber liner and top up the moisture levels in summer, as true bog garden plants, such as native marsh marigolds and the lovely Japanese Iris ensata, soon look very sick if subjected to dry summer soils.”
Getting started
To create a bog garden from scratch, excavate your designated area to a depth of 45cm. Calculate approximately the volume of soil you will need to shift (length x width x depth), and if this seems excessive, consider reducing the size of the area.
Line the hole with polythene sheeting or Butyl pond liner (at least 0.5mm thick). Place bricks or stones on the edge to stop it shifting as you walk on it. Pierce the liner at 1m intervals with a garden fork. Lay a length of leaky hosepipe or porous pipe in the bottom and seal the far end. The other end needs to come up and out of the bog garden, so that it can be used to apply water for irrigation.
Cover the bottom and the leaky hose with a 2.5-5cm layer of coarse grit or gravel to prevent soil blocking the holes in the pipe. Replace the excavated soil, removing any weeds and large stones in the process. If the soil is low in organic matter, incorporate compost, leaf mould or well-rotted manure. The soil level will now be higher than originally but will settle in time. Only flatten the soil lightly, as heavy compaction will result in poor growing conditions. You’ll need to continue to weed the soil as it settles further, and once it’s settled back to its natural level, the bog garden is ready for planting.
If you have an area that is naturally waterlogged all year round, you may not need a liner to create a bog garden. However, be aware that bog garden plants do need some drainage and air around their roots. They will not thrive where the soil is so wet or compacted that water pools on it and little drainage occurs.