30 Sep 2014

Planter Box Guide

Posted by Leo

There’s a lot more to a planter box then just a large box with some soil in it, you have to use the right materials, in the right proportions in the right order. BC Sands expert staff, together with some or our industry expert clients have developed this easy to follow Planter Box guide.

Step 1. Make or purchase a planter box. You can make your planter box from bricks, blocks or timber depending on your needs and taste. BC Sands has a wide range of bricks, blocks and treated pine timber. Give us a ring, drop by the store or visit the website for material options.

Step 2. Ensure your planter box has adequate drainage by drilling 10mm holes in the bottom.

Step 3. The inside of your planter box needs to be waterproof. This is easily achieved by painting the inside of your planter box with a waterproofing membrane. This ensures your planter box in watertight and water only goes where you want it to go, down the drainage hole/s.

Step 4. Line the planter box with protective board or corflute. In the bottom of your planter box add a drainage cell.
Have no idea what corflute or a drainage cell looks like? Don’t worry, our helpful staff will help your get everything you need.

Step 5. On top of your drainage cell add a layer of Terrafirma / Geotextile. Lay this fabric over the drainage cell and up the sides of the planter box. To attach the fabric to the sides of your planter box, use either a staple gun, flat head nails or specialised fabric nails.

Step 6. The next layer is a 100mm layer of aggregate (blue metal). If you give BC Sands staff the measurements of your planter box, they will work out how much of each layer you require.

Step 7. Cover the gravel with another sheet of Terrafirma / Geotextile fabric so the gravel doesn’t mix with the soil.

Step 8. Add some high quality, planter box specific, soil mix. It is important that the planter box mix is specifically designed for use in a planter box, otherwise you risk the soil becoming Anaerobic (which means ‘without air’ and can lead to potentially toxic bacteria! Not only dangerous it also leaches an unpleasant smell.
You may need two types of planter box mixes depending on the depth of the planter box; Planter Box A Mix and Planter Box B Mix. Planter box A goes down first and needs to be around 200mm deep. Then Planter Box B mix goes on top of the Planter Box A mix. Refer to the diagram on page one for a cross section of the various layers.

Step 9 . Plant your favourite vegetables, plants and flowers, either from seeds or small plants. Follow the plant / seed instructions for depth and distance measurements.

Step 10. Spread 50mm – 100mm of mulch on top of the Planter Box B mix, sit back and admire your handwork.

Getting started

The friendly staff at BC Sands can help you select all the right materials for your planter box project. Give us a call, order directly from the website or drop into one of our two convenient locations.
BC Sands has a huge range of all the products you need and a range of delivery solutions so you can get your mulch exactly where you need it.


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