How to work out the best height, length and width for a raised bed
Working out the Height: Stand,kneel or sit, if working from a seated position or using a wheelchair and holding a trowel reach out with your arm slightly lower than your shoulder, Measure the most comfortable position from the lowest point of the trowel to the ground and that's the best height for your raised bed.
Working out the width: holding the trowel, without stretching, reach across the imaginary raised bed and work the trowel as if planting or weeding, that's the best width for your raised bed.
If working from a wheelchair or wheeled garden seat the dimensions for a raised garden bed are best calculated from a side on position.
The length: the length of your raised garden bed can be as long as you can safely make it and navigate. A sleeper bed formed with the sleepers laid on there side, forms a useful seat to sit and work from and to take a rest.
Raised beds can be made from just about any material that will hold soil.
A raised bed, either made from sleepers, tyres or concrete blocks that has a top wide enough to form a seat to sit on as you are working in the garden, Is a good Idea.
Used bricks and breeze blocks are cheap or even free. Breeze blocks laid on there side make a good seat to garden from.
Sawn timber is a fairly low cost material for making raised garden beds.
Old planks around a simple frame of corner stakes well hammered in.
Any containerthat's deep enough to allow space for roots and spread, potatoes grow well in buckets.
Old pre formed garden ponds are a cheap way to make a raised garden beds.
Old tyres can be used to too, two or three tyres stacked on top of each other make cheap raised beds to grow your vegetables in, they absorb the heat in the morning and radiate it off at night. This helps to keep your plants warm and encourage growth
Hay or straw bales are interesting and well worth a try. I have included some hay bail garden tips onthis page hay bale garden
Concrete slabs set on end in the ground, not pretty but If you know pulling up an old patio could be free.
Upturned lawn turf. If you know anyone turning a lawn into a patio or stripping a lawn, ask them for the turf they are removing, they will be pleased to drop it round for you, saves them hiring a skip.
Sleepers look good and are fairly easy to make safe and if fixed on there side form a seat to work from or rest.
How many sleepers to make a raised bed.
Four to form a six foot square about a foot high cost £100.
Eight to form a two foot high x six foot square raised bed cost £200 and so on.
Building raised garden beds
Whatever material you choose to construct your raised garden bed the completed bed should be comfortable and practical for you when you are gardening
The beds must also be safe to use, If you are building it yourself, using concrete or stone, or the height is over 2ft, consider these points.
The higher the structure the higher the chance of failure. It is important to be aware that as the retaining wall height increases, the force trying to topple the wall increases by a large factor. For example, if you double the height of a wall, the tipping force can increase by a factor of three or four times.
Frozen soil expands as it freezes and can seriously damage the material retaining the soil. So in areas where frost is likely this is minimised by backfilling the wall with gravel. The soil and area itself needs to be well drained so that water can't build up behind the wall.
If it's not possible to drain the water away from the wall because the slope in the garden behind the wall is to severe, the water can be drained through the wall by installing weep holes at the base of the wall.
Depending what is built under the wall, you then may have to think about where this water is going to be drained to.
Garden Drainage information can be found on my garden drainage page
I design and build accessible gardens, incorporating raised garden beds, for elderly gardeners and people who find bending or stretching difficult. Tips and contact details can be found hear Garden design for elderly
To save money you may prefer D.I.Y. using self assembly raised garden beds, they usually come complete with stakes and screws and instructions on how to assemble the kit. I have selected a few below :
sensibly priced bed made from plastic heat absorbing panels and it packs flat at the end of season. Available for under £25
No digging out required. 1m square by 25cm deep - 230 litres Highly effective for growing vegetables! Can build bed one bed on top of another for wheelchair access Comes with full instructions.
Full details and more self assembly raised beds, please click on the picture.
Raised Bed with FREE Cloche
Wooden Raised Bed with FREE Cloche for under £50
Guaranteed against rot for 10 years
Can be stacked for extra height and depth
Easy to locate on hard surfaces or open ground
Ideal for growing, vegetables and plants
Pressure treated wood
How much top soil will I need to fill a raised bed
About one ton of top soil will fill a 6ft x 3ft x 12" bed.
Find a local supplier who will deliver and possibly tip it into the beds for you.
You can advertise on freecycle for topsoil and stuff to form a raised bed but will need transport.
Any soil from your garden will do, sandy soil will need compost added. loam is Ideal, clay is hard to work but is actually very good stuff to grow in, It's full of nutrients. Its the digging that is so hard. Digging in lots of grit sand makes it easier to dig. If you want to improve clay soil read this. Also remember, deep digging can be a thing of the past, as long as you keep it weed free and fork it over now and again,tips here no dig gardening
Improving and keeping raised bed soil in top condition
When you hoe, rake or fork the soil over add some grit sand and home made garden compost until the texture is how you want it. You might want to consider no dig gardeningI have explained how to start here gardening without digging
No real need for weed suppressant fabric, weeds will struggle to grow though a foot of soil. Most weeds are airborne, so will grow on top of the weed suppressant fabric anyway.
If you have a bad back or a disability that stops you bending or getting down low or garden from a wheelchair, building wheelchair accessible raised garden beds, makes it a lot easier to keep on gardening.
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