i an a newbie to gardening but we have just moved house and I finally have the space to do container vegetable gardening, I am recycling about 10 of 64 litres storage plastic boxes for this (really useful archive box). I believe they are food grade.? I also have some wilko potatoes grow bags; all the containers have drainage holes which I did myself. My dilemma now is the recipe I need for the potting compost. I have 150 litres of screened spent mushroom compost, 100 litres of wickes top soil, 150litres of sharp sand, and 350 litres of multi purpose compost. I also about 75 litres of composted bark which I think is good for mulching and 100 litres of vermiculite.
I intend to grow the usual vegetables, peas, carrots, aubergine, brocolli, cauliflower,sweetcorn, tomatoes, potatoes, strawberries and salad. Also, I have an old wicket laundry basked I intend to turn to herbs basket.
Could I please have advice on how to mix the potting compost.