Is there a good general rule for the width of a foundation planting bed ?? I thought I read somewhere that it is best if the width is 1/2 the height of the house. Example 22 ft house = 11 ft bed width. Thank you.
Wide enough so your plantings can be far enough away from the foundation of the house.
Find out how wide the plants you want to use will be. Place them far enough away from the house that you'll be able to get between them and the house. Leave enough room so they don't overlap the lawn, and leave enough room for you to run an edger on the bed surface. That's your minimum width.
If your house is 22' tall, but your foundation plants will only be 3' wide, a 6' foundation bed is enough. Although if you're using taller, wider plants, or want more than a single row of plants, your 11' example might not be wide enough. I don't think you can reduce it to a general rule that relates to the height of the house. It all depends on what you're putting in the bed. Although taller houses may (or may not) need taller plants, and taller plants are often wider, too, that's not a hard and fast relationship. It all comes back to how much room what you're planning on planting will need.
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