Raised beds present an ideal method for growing vegetables. Some
advantages of raised bed vegetable production include:
: Earlier and later harvests, thus extending the
growing season. Because the soil in raised beds is 6-12" higher than
the adjacent soil, it drains quickly and heat up rapidly in the spring.
Seeds and some transplants can gain A 2-6 week head start;
:Efficient use of space. Vegetables are placed in a triangular
grid pattern so that each vegetable receives only the space it needs;
:Improved soil structure. Soil compaction is greatly reduced
because the beds are never walked on after being tilled, and the addition
of compost increases the organic content of the soil. This is ideal
for carrots and other root crops that require extensive root penetration.
To construct beds, rototill or dig until the soil is well loosened
to at least six inches. Place two parallel strings four feet apart
over the area to be planted, and shovel the loosened soil an both sides
of the string onto the raised bed area. Add an inch or two of compost,
and rake level. The result is a four foot raised bed that is 6-12
inches higher than the adjacent paths.
Some growers using raised beds frame their beds with wood. While
ordinary rough cut wood is the least expensive choice, it will rot out
in a few years and need to be replaced. Eight inch cedar boards,
which are rot resistant, are a better choice. Cedar is very expensive,
but it's cost is generally covered with the very first crop. Do
not use pressure treated wood because the toxic wood preservative,
chromium copper arsenate, will leach out and contaminate the soil. Steel
corner brackets make the sturdiest frames.
Raised beds, either framed or unframed, offer so many advantages
that it is surprising that more backyard gardeners do not use them. I
have over 50 cedar framed raised beds on my farm.