Cut & Paste from another subject. Where are you located?
Good questions. Don't have the answer. Your environment is very different than this one in South Eastern PA (USA). If we were to make a raised bed garden I would start with a boundary for raising the bed, I would try to get some black locust logs. I would surely not consider using railroad ties or any other type of treated wood with attention on the chemicals in treated wood leaching in your garden. Black locust as it dies or as parenchyma cells die (symplast) the nitrogen based substances move out. So in order for common fungi to break down the wood, such as a post in the ground, Some people ask me if I have a PhD, yes, I have several post hole diggers somewhere. Black Locust (Robinia pseudoacacia) was named after the first arborist. The first arborist's name was pronounced "row-bin"(sic)? I was taught the tree was named after him, i.e., from a reliable source. Then I would go get a dump truck load of Certified Organic Mushroom soil from Mother Earth Organic Mushrooms.
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I then would (Land lord makes final decisions) would add about a dump truck load (7 commercial yards) of screened top soil. Together by mixing the both I would hope to end up with good soil. Defined as a substance made up of sands, silts, clays, decaying organic matter, air, water and an enormous number of living organisms. I myself like zucchini and it grows well with little if any so-called pest. I think we are going to close this garden in. A late client and his wife had a organic garden - WOW! They wrote some sections for me
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My father has an organic garden and he is going to start some plants for me. I would get a load of leaf compost from somewhere. Its great when its just been screened. I would mulch the plants with leaf compost to keep down 99% of undesired plants (so-called weeds). It would be serving multi functions like feeding the soil micros and retaining moisture. I hope we get one together. Good luck with yours. What are some of the native trees in your area? Does anyone have a suggestion related to keeping the leaf compost off the stems of the plants. On those plants I would put the leaf up to the plants. Chicken manure would be best if composted for a year or more. The people I have gardened with don't use products like preen. Don't require it. Why waste the money on something not required to have healthy plants? Leaves are great. I would make an attempt at adding some composted wood chips to feed the soil cellulose. As long as they are composted and symplastless I would think they would be fine. Any thoughts?