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once set up, the amount of work you have to do every year (digging and so on) is much reduced
there is an improvement in soil structure because of reduced compaction from being walked on
you can cut down on the amount of compost or fertiliser you use, because you don't waste it on areas that aren't going to be used for growing.
The basic idea of the deep bed is that you divide your plot into sections about 2-3m (6-10') long by about 40cm (4') wide, separated by pathways about 500cm (2') wide. The dimensions are important: the width should be no more than is comfortable to reach across (for weeding, planting, harvesting and the like) from either pathway. The length should be long enough to be usable, but not so long that you are tempted to take a shortcut across the middle. If you do find yourself doing this, cut the bed in half with another path. When planning the layout of the deep beds, try to align them so that the length of the beds is on a north-south axis, to give the crops maximum benefit from the sunshine, and when planning the cropping of the beds remember to site the tall crops on the northern side so that they do not overshadow the lower growing crops.
Many people use wooden or plastic supporting 'walls' around the beds. You can make a frame out of planks of wood, if you wish. However, if you have any trouble with slugs or snails (and who doesn't?), you will quickly find that these provide a lovely little haven for them. You may prefer to go without, or you may work on the principal that, if you know where the culprits are, they are easier to deal with.
Although it may be tempting, to make the layout look attractive, don't stagger the paths. Put them in straight lines wherever possible. Remember, you will probably be wheeling a barrow down them at some point, and a straight line is the shortest route between two points.
If you're doing a four-course rotation, double dig one bed in four for four years, incorporating large quantities of compost and, if possible, farmyard manure, as you replace the soil, and removing all the perennial weeds. The incorporation of large amounts of organic material means that the completed bed has a surface several inches higher than the pathway on either side. These heavily manured beds will be used for the more hungry crops, such as brassicas. Single dig and weed the remainder. From this point on, the beds aren't walked on or disturbed.
The initial manuring of the beds will provide adequate nutrients for the first year's cropping. From then on an annual dressing of blood, fish and bone or another organic fertiliser in the Spring, together with further applications of compost as a mulch, will keep soil fertility high.
Check the pH of the beds every other year with a soil testing kit and apply a sprinkling of calcified seaweed if the beds are becoming too acid. Avoid any major disturbance of the soil: just sprinkle the fertiliser or calcified seaweed onto the surface and hoe it in lightly. Because the soil is so friable, it is possible to harvest deep-rooting crops such as carrots, parsnips, salsify and scorzonera without the aid of a fork: they can simply be pulled out by hand.
About the Author
Frann Leach, Ramsgate, Kent, UK
Frann lives in Ramsgate, Kent, UK with her computer and her cat, Muffin. She has her own referral marketing business and is always on the lookout to recruit go-getters like herself.