I didn't know where to put this but it is about raising plants.
We build a nursery bed out of old roofing sheets. Simply a post in each corner the whole sheets screwed on. Because the sheets were long we whacked to starposts in to stabilize the whole thing (the bed is 3 m long and 1.5m wide). We had a huge compost pile laying around which didn't do a thing because it was so dry we filled it with the compost stomping a bit on it and water everything in. Then we put a layer of bad soil and a layer of good soil on the top.
I really like this because I hated these styropor flats or even worse pots. It is very space saving and I can raise a lot of plants in a small space and I don't have to bed down all the time. I will build a second one.