Posted: 29/04/2012 at 15:14
Wondered if this article I wrote was of any use.
We found a number of these old Belfast type sinks around the garden. This is how I turned them into alpine growing areas.
The sink was scrubbed with bleach to remove any dirt and grease before being painted with a neutral shade of exterior paint. Once the sink has been filled with soil it is very heavy so position it in its final spot before going any further.
The plug hole was covered with a piece of zinc foil. This helps to stop worms from getting in and also prevents the filling material from being washed out and blocking the drainage hole.
To keep the foil in place I put some pieces of stone over it to weight it down.
Next I put a layer of 12 mm gravel over the bottom of the sink to about a depth of 5 cms or so.
A layer of smaller grit and sharp sand was added over the top of the gravel. This was 5cm crushed granite
Now the sink was filled with a mixture of John Innes No. 3 and more of the 5mm gravel, in the ratio of 3 to 1 by volume.