What do you find helps to promote drainage in mostly grey clay soil?
Grey clay is usually alkaline [asris.csiro.au] If i was dealing with it i would adjust the ph to around 6.5 with elemental sulfur, adopt a lasanga style garden and build compost in place with only tilling in at the end of the season each year.
It depends on the nature of the clay as well as the alkalinity of the soil. With acid soils you are better off using lime or egg shells to moderate it. Wood ash does wonders to but with the charcoal not without. You would be best to use coarse sand or pea gravel as well. For these soil choose compost over peat or manure.
For alkaline soils mulch, peat and some manure works well. Be aware that cattle manure is often far too, rich for most soil, horse however works quite well; just prepare to deal with the weeds it brings.
I'm not an expert, but I would imagine sand might help.
Raised beds is probably the easiest way to go filled with top soil (from a nursery).
Or this crushed up shell stuff.. Vermiculite? Something like that.
Vermiculite helps retain the moisture in the soil. Perlite helps it drain easier.
@AstralSmoke Vermiculite in huge for aeration same with Perlite but perlite will retain moisture and help excess water drain. Vermiculite doesn’t hold water
Rototill sand and compost into the clay then leave a drainage point from the garden via a french drain if you have some slope to the property.
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