Raised beds over concrete or asphalt?
southern Ontario, Canada
I'm planning on installing raised beds overtop a concrete and asphalt pad on my property. I'm concerned about:
1) lack of worm activity for aeration
3) type of barrier to use between the soil in the bed and the asphalt/concrete base
4) minimum depth of beds required for certain plants (tomatoes, for example)
5) Any other insights about this arrangement your experience has taught you!
Your insights will be greatly appreciated!
- 28 May, 2009