My wife and I want to build vegie garden beds around 90 cm high. Here are some issues to resolve.

Here are my unresolved questions thus far:
i) What are the cheapest, most durable and non-toxic materials we should be using?
ii) Are commercially available raised beds, such as Birdies for example, worth their cost?
iii) What do we use as ballast/fill at the bottom of the bed, say for the first 45cmm or so?
iv) What is the best watering system to use?
v) How do we prevent water loss from exposure to sun because the beds are raised and plant's are normally under the ground?
vi) Are there any other issues we haven't covered?

Asked by Gregory Olsen

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