How to make an alpine trough

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How to make an alpine trough

BBC Gardeners' World Magazine

Published: Friday, 24 May 2019 at 3:00 pm

Follow our step-by-step guide to making your own alpine trough, perfect for displaying your alpine plants.

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Old stone sinks make perfect containers for alpines, but they're hard to come by. You can easily make your own concrete lookalike; all you need are two strong cardboard boxes. One should fit inside the other, leaving a gap of around 5cm. Simply make a mould from the cardboard boxes and fill it with a concrete mix. Adding coir to the concrete mix will give your container a rougher texture, and the trough can be easily distressed with a trowel to give it a more aged appearance.

You Will Need

Bricks
Coir fibre
Cement
Plastic sheeting
Sand
Trowel
Card boxes (2)
Wire mesh
Wooden dowel

Total time: A weekend

Step 1

Mixing coir with cement

Mix together two parts sieved coir fibre, one part cement and one part sharp sand. Pour water into a well in the centre and mix it together to form a stiff paste.

Step 2

Placing cement in the cardboard box

Using a trowel, place a 2.5cm layer of concrete into the bottom of the larger cardboard box. Ensure the concrete is spread into the corners.

Step 3

Placing wire mesh over the cement

Cut a piece of small-gauge wire mesh to fit the bottom of the box. Place it on top of the mixture to reinforce the trough, and add a further 2.5cm layer of cement over the top of the mesh.

Step 4

Weighing down the second box with a brick

Push 5cm-long pieces of wooden dowel into the base of the trough for drainage. Then, place the smaller box inside the larger one, leaving a gap of around 5cm. Add bricks to weigh it down.

Step 5

Adding wire mesh to make the sides

Insert sections of mesh along each side, cutting them shorter than the depth of the box so they'll be hidden.

Step 6

Adding cement to make the sides

Add cement to the sides of the mould to make a wall. Use a stick to push it into the corners. This will prevent air pockets from weakening the walls.

Step 7

Weighing down the box with bricks

When all the concrete mixture is in place, support the outer sides of the box with more bricks. Then cover the entire thing with a plastic sheet.

Step 8

Peeling the cardboard from the box

After two days, when the concrete is set, remove the sheet of plastic and supporting bricks and peel the cardboard away from the sides.

Step 9

Finished alpine trough

The sides of the trough can be aged by roughly scraping them with a trowel. After a week, use a hammer and large nail to push the wooden dowels out of the trough, leaving holes for drainage.

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