Raised beds are a wonderful and easy to manage design and gardening system for both beginners and the seasoned vegetable, fruit and flower gardener. L'amour Botanique has been using raised bed systems for over 15 years; wouldn't it have been lovely to have them in kit form then!
For information about why growing in raised beds is brilliant see below
So somewhat biased in favour; I can sure you can tell, the advantages for the raised bed gardening system are:
The soil inside the raised beds is never walked on therefore the soil structure is protected and there is plenty of air between the soil particles which is vital for healthy plant growth and living soil organisms.
The beds are wide enough for growing a good quantity of produce yet slim enough to reach everything inside from the surrounding pathways.
Sowing and planting can be of uniform spacings over the entire bed rather than having to leave wide gaps for pathways thus utilising more space and having more yummy produce.
Weeding seems less tedious and the chore is easier! Yes easier! Choose one bed and weed it, done so seemingly quick with a defined space rather than over a large traditional area. Also the shallow and some deep rooted weeds will just pull out easily (they will be less inclined to take a strong hold as they are not being walked upon).
By spacing plants closer over the whole bed weeds will be nominal as there are no gaps for them. If you have an idle bed waiting just cover it over.
A small amount of water can be saved as you target your plants rather than your pathways..by closer spacing you are also helping to keep moisture in!
Planning and designing each bed is very simple and can include vertical systems for trailers like squashes etc ...makes raised beds asthetically pleasing to look at.
They are great for children who can have their own raised bed and portion it up in square foot bed style ( for example; portion a raised bed into 4 and they can design what and where they are going to plant-in a very manageable way)
Disadvantages... none to date really..although... small quantities of potatoes do well in raised beds we tend to plant and rotate larger quantities in open ground.