If the cost is not considered, of course, it is best to buy that kind of professional planting box. Not only is it more conducive to vegetable planting, but it is also more neat and beautiful. This special box also has a filter soil layer, so don't worry about drainage. Growing vegetables in soil requires a soil layer at least 20 cm thick. If the whole roof is covered, the weight will not be light. If the bearing capacity of the roof is insufficient, the danger exists, and with the passage of time, the danger will become more and more serious! So this should also be taken seriously! When growing vegetables, you should master the origin range of your roof in advance. In other words, it is necessary to know where the roof can be pressed down, how much it can be pressed down, and where it can't be pressed down, so that the whole roof has weight. Then, within this range, try to plant shallow-rooted vegetables in a small area, and the smaller the possible roof weight, the better.
I may be a person with different interests. In the past few years, I suddenly fell in love with growing flowers. It seems to have exploded suddenly. Look for information on the internet every day, buy flower seedlings and buy flowerpots. After a few years, it seems too young to grow flowers. It is even better to use flowerpots to cook all kinds of dishes. Think about it and do it. Waterproof your roof again, and move the flowerpots and unnecessary pots to the roof. Then I ran to the mountain, picked a few bags of pine needles, mixed with rotten rapeseed cakes, and started my trip to grow vegetables on the roof.
As a farmer, I also know the experience of growing vegetables. The accumulation of planting flowers for many years makes me feel that roof planting is easier to master than planting flowers. The first attempt made me a great success. This makes me very happy. Many people question the difficulty of growing vegetables on the roofs of rural houses. I don't think so. I summed up my experience in eight words: thin and fat, diligent. Why do I say that? Or it is because the vegetables planted on the roof are different from those planted in the ground, and the water content and evaporation are different, so it is difficult to preserve large chemical fertilizers.