The trouble with adding stuff to a planting hole is that you encourage the roots to stay where the soil is good. What you really want the roots to do is to spread out through the surrounding area. A small root area means that the plant is very susceptible to drying out and once the food in the planting area is used up, the plant begins to fail.
If your soil is that bad dig a square hole at least 3 times as wide and twice as deep as the pots, mix some of your JI3 with the soil you have taken out and plant. Water well and often and in autumn and spring mulch with manure or compost keeping it away from the stems, you can also give it a spring feed.
Yea that’s why I’ve done I dug the whole 3 x the size of the root ball and added some bone meal I always thought you had to mix Soil with the compost my bad I did not no that it makes the plants weak
At least you do not seem to have to use a 5 foot long wrecking bar, a strong pair of loppers and a sharpened spade to dig your hole for planting. That is what I had to do today to plant a Foxglove (Apricot). Ended up with half a bucket of stones too.
Best of luck. Your shrubs will thrive with the TLC you have given them.
Wow sounds like you was excavating lol that sounds like tough work I was sweating buckets today just planting mine thought I had it easy lol and thank you I do take good care of them all
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.