How to fill a raised bed
I was looking for some advice on how to fill a raised bed please. I have had my allotment since February and worked the top half of it this year. Since it had been unused for a few years, it is full of weeds and no matter how much I weed it they come back thick and fast.
I am currently working the bottom half and am in the process of making some raised beds in the hope of eradicating the weeds in that section next year. I have just finished the second bed and have paved around using reclaimed slabs.
I want to fill these with some sort of mix which will include horse manure so that they have a few months for the worms to do their work with the intention of having a weed free, nutrient rich bed to work with next spring.
I have lined the interior of the first bed with weed suppressant and intend to fill it with something before the winter kicks in. Since I don't think the worms will get through the suppressant, can I/should I buy worms to put in the beds?
I had initially thought of buying some topsoil but wondered if anyone had any better ideas?
I have considered digging a deep hole in another part of the allotment and taking soil from a couple of feet down (with the hope that it would not be full of seeds and weeds). Is this a good idea or will it be lacking nutrients?
Does anyone have any tips for a good standard mix (as cheap as possible too!). I don't know what I will be growing in the beds yet but intend to build about 10 of them over the next month.
Any tips would be very gratefully received. I have pasted some photos below.