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How to build a planter box
 
 

How to build a planter box

How to build a planter box for herbs

How to build a planter box

Overview

I needed a planter box that wasn’t very big so I could grow some rosemary and thyme. These tend to grow quite bushy, so the planter box could be too small either. The design I decided on suits it just fine, and I made it from recycled and left over wood I had already, so it didn’t cost me anything.

Disclaimer

This instructional guide and the material covered is for informational purposes only. I take no responsibility for what you do with this knowledge.

Safety Information

Use safety equipment when operating equipment. Take necessary precautions to avoid injuries to persons/animals and damage to property when operating equipment. Always abide by the manufacturers safety information and warnings when using equipment.

Tools required (linked to my recommendation)

Materials required (see figure 1)

Item Description Length Width Qty
1 Timber 2×6, 7 inches long 7 inch (178 mm) 6 inches 1
2 Timber 2×6, 4 ft long 4 ft (1.2 meters) 6 inches 1
3 Plywood 1/2 inch thick 50.2 inches (1276 mm) 3 inches (75 mm) 2
4 Plywood 1/2 inch thick 50.2 inches (1276 mm) 2 inches (50 mm) 4
5 Screws, 2 inches (50mm) long 2 inches (50 mm) 20
6 Nails, 1/2 inches (25mm) long 1/2 inches (25 mm) 20
7 Black plastic 5 ft (1524 mm) 1 ft (300 mm) 1

How to build a planter box - Figure 1

Instructions

  1. Cut a 2 x 6 piece of timber to the lengths and quantities specified for items (1) and (2) in the table above.
  2. Cut 1/2 inch plywood to the sizes specified and quantities for items (3) and (4) in the table above.
  3. Drill holes in the two items (2) and attach it to the item (1) using the 4 screws (5) , as shown in figure 2.
    How to build a planter box - Figure 2
  4. Drill holes in the sides of the two plywood pieces (3) and attach it to the planer box using 8 screw (5), as shown in figure 3.
    How to build a planter box - Figure 3
  5. Drill holes in the sides of the four plywood pieces (4) and attach it to the planer box using 8 screw (5), as shown in figure 4.
    How to build a planter box - Figure 4
  6. Place the black plastic (7) inside the planter box. Fold the corners to make it fit, as shown in figure 5.
    How to build a planter box - Figure 5
  7. Nail the black plastic (7) to the sides of the planter box using nails (6), as shown in figure 6.
    How to build a planter box - Figure 6
  8. Cut holes in the black plastic for drainage.
  9. Fill the planter box with a layer of stones (for drainage), leaves, grass clippings at the bottom – this will breakdown to form compost over time. Add a soil mixture on top of this, suitable for the herbs or plant you will be planting. I used a half potting soil, half compost mixture for the rosemary and thyme, as shown in figure 7.
    How to build a planter box - Figure 7
  10. Plant the herbs with enough space in between for growth. Give it a good soaking to settle the plants in, as shown in figure 8.
    How to build a planter box - Figure 8

Planter Box FAQs

What size should a planter box be?

Planter box size would depend on what you want to plant in the box. For smaller plants e.g. herbs and lettuce the box can be quite small, as long as there is sufficient space and depth for the plants to grow. Larger vegetables would require more space and depth.

How deep should a planter box be?

For most plants a depth of 6-8 inches (150-200 mm) should be deep enough, but for larger vegetables (i.e. cabbage) would need about 10 inches (250 mm)

What should I fill my raised garden bed with?

Fill the bottom of the planter box with leaves, grass clippings, straw, wood chips and other organic materials. This will breakdown and become compost. Add a mixture of potting soil and compost on top.

Should I put rocks in the bottom of my raised garden bed?

Some plant require good drainage and adding a layer of small rocks, stone or larger gravel will help with drainage.

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