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June 24, 2012

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Jahid

I plan to build a raised garden bed in my back yard to grow vegetables (tomatoes, squash, etc.). I am planning to raise the bed only about 5.5 from the ground. Is that enough to make a difference or does the bed have to be higher? It seems like there are lots of variations on bed height from about 5.5 to about 30 . I don't know if this makes a difference, but I am in Zone 7. Thanks for the help.

Darach Seaton

Jahid - Thanks for the questions. For tomatoes and squash, I would recommend somewhat deeper beds than the 5.5" you propose. These plants need a fair bit of water to develop and fruit well, and deeper soil accompanied by good, deep watering, really helps. Also, any root crops except radishes need a good 10-12" or more (parsnips can easily get 14-16" long). Potatoes and asparagus need even deeper soil - 18" or more.

However, all is not lost! The 5-6" beds are good for all kinds of lettuces and other greens, as well as strawberries, so there's still plenty you can grow. In addition, if you decide you want deeper beds, it isn't hard to add another layer of boards and soil on top of the existing beds before you plant the next round of crops.

Finally, you can also dig down as well as building up, in order to get greater soil depth in certain areas of your garden. A minor disadvantage with this option is that you will likely pull up a few weed seeds from the old soil beneath - but a little bit of extra (and consistent) weeding will take care of this, of course.

Good luck with your garden!

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