By Alanturk
Wiltshire,
United Kingdom 
Some time ago I asked about my Mimosa that seemed a little unhappy soon after it arrived. Since then I have transferred it to a larger pot, where it has been growing pretty quickly. I think now is the time to plant it in the ground and have been advised to use horticultural sand and ericaceous compost in the hole. My soil is rather sticky clay with a thinnish layer of better soil on top. I propose to put it against a south-facing shed wall. I live in Wiltshire, UK. My question is: does anyone agree or disagree with the advice I have already received, or can offer anything more? I suppose I'm looking for a second opinion, so anything anyone can offer would be very welcome.
27 Apr, 2022
Answers
Gypsum, and/or a small amount of limestone will probably also help the drainage and soil structure. Slow acting, though.
28 Apr, 2022
Previous question
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They like neutral to slightly acidic soil. so if you can grow azaleas rhododendrons and camellias without adding peat etc to the garden it will be fine in your own soil. The RHS recommends a loam based compost for pots.
https://www.rhsplants.co.uk/plants/_/acacia-dealbata/classid.2000032100/
27 Apr, 2022