Rangakuanswered grow question 4y ago If you have a week or more before you are planting I’d get some gypsum into the hole you dig to help start breaking the clay down , then throw in some leaves , bark , wood chips and some charcoal over the top of your gypsum.
Then a week or so later fill in the hole with topsoil and worms and blood and bone just follow the instructions. Then feed it with seasol or something similar once the plants are a few weeks adjusted.
This is what I’ve done in the past for awesome results and is only anecdotal advice at best .