If we are thinking of building raised beds on concrete, this is a fabulous idea and can very easily become a reality. It is a concept that has many advantages, not overly expensive and when complete, looks very appealing and attractive. We have two options to look at here; firstly, we can construct this on a concrete surface, which will make for a solid foundation and secondly we can easily construct a raised bed from concrete or builders blocks which we can locate in our backgarden. Either of these two options will work and both ideas can become very worthwhile projects.
If our backyard is completely concreted over,then obviously we have an ideal surface for your raised bed. If we decide to carry-out this job ourselves, select a nice level area and begin building with the first course of blocks. A height of two rows high should be sufficient as this will give your bed a depth of approx 1-2ft. The standard size of these beds is about approx 8-10ft x 4 ft, but it can vary depending on the amount of space we have and also the amount and type of building materials.
Building a raised bed on concrete;
Hiring a blocklayer or tradesman would be a great idea for this project, as we need this task to be a job that looks well, is sturdy and it also needs to be waterproof. We don’t need any excess brown coloured water to be seeping from the bed as it would look very unsightly and could easily discolour your existing concreted surface. Before we fill this concrete raised bed with soil, we will need a small layer of gravel and stones on the bottom to absorb any excess water. This system ensures that the bed never dries out completely, as plant roots will always reach downwards in their search for water.
Concrete raised beds in our backgarden;
Building a raised bed from concrete blocks on your garden surface is another option. For this job I would strongly advise hiring a blocklayer or tradesman again. The reason is something similar to above. We need to dig a trench roughly the size of our bed frame, a base foundation of mortar is made for the blocks. The reason for this is to create a solid foundation so as to prevent subsidence and thereby giving us a solid base for our concrete blocks, which will make the walls of our raised bed. This method will make a sturdy, safe, sustainable structure and should last a life-time. We might consider this method expensive, but if we have any blocks lying around from a previous building project, these will also suffice and will help defray some of the project costs.
The two above methods of raised beds on concrete are both rot and pest resistant. The other great advantage is that the blocks, which are made from concrete, will hold most of the heat from the mid-day sun and carry same well into the night. This extends growing periods and provides healthy, sustainable conditions for your plants, vegetables, flowers or shrubs. If we ever need to erect a polythene cover over our bed we have a sturdy structure for implementing and installing this option. A strong sturdy trellis can easily be added to the equation as we have strong base walls to support and attach same.
Happy gardening to all,
Cheers Phil Browne.
” A garden must combine the poetic
and the mysterious with a feeling of serenity and joy ”