Hello! I used to hang out on the gardening chat thread years ago but haven’t been around here for a while. I do grow veg but my passions is ornamentals really.
For those asking about improving soil, especially clay, I have had excellent results using the ‘lasagne’ method. It’s a fairly long term approach but works extremely well.
First, dig out as many perennial weeds as possible but don’t worry too much if you can’t get them all. Then cover the soil with thick cardboard; if you’ve left weeds in you’ll need a double layer. Water the cardboard so it’s nicely wet and then cover it with a layer of homemade compost if you have it, or well rotted manure if you can get hold of it (you can use fresher manure if this is a properly long term project and you can leave the border for six months before planting). Spent compost can also be used. Then cover with a layer of grass clippings.
Repeat - so cover this with more cardboard, next layer compost/manure, then grass clippings.
How long you keep layering depends on the starting state of the soil, availability of stuff to layer with, and your patience!
You are basically alternating green with brown layers, as you do in a compost heap. So, lawn clippings are the green - you can add veg peelings or any shredded soft green garden waste (but avoid weeds). Brown is the manure, cardboard, compost etc - fallen leaves are great if you’re doing this in autumn, or finely chopped branches if you happen to have a chipper.
Leave for a few months. I used strulch (strulch.co.uk) on the top as this stops weeds germinating while you’re waiting for your lasagne to ‘cook’! But a final layer of grass clippings or woodchippings would do the job.
You can then plant into your lasagne, and when digging down into the old soil below, you should find it massively improved!