Elixir Gardens Gypsum Calcium Sulphate Agricultural Grade Natural Soil Improver

Great item slowly but surely eats away the clumpy clay under my lawn, it's drained loads better. I drilled holes 2 foot deep put a 1kg in each hole. Mostly filled the hole with water and left it to drain for a few days. I then packed it with compost as that burns at clay too. Topped the compost up a few times until it was firm. Last few inches I put topsoil in. Worked great after a few month. It takes time. I will do 6 monthly sprinkling sparingly to keep at that clay. It did great at the bottom of planters but just a tiny bit. Just don't use on acidic soil loving plants, check guidelines on plants

I bought this, as I have a really heavy clay soil. The main thing I was hoping to do was improve the drainage under my lawn by braking up the clay. This product comes with straightforward instructions and doesn’t take long to apply. I used this over a month ago and so feel I can now review the results. This has made a slight difference to my lawn, although not the level of impact I had hoped. I applied it after removing plugs from the lawn to try and get the product deeper into the lawn. You may then wonder why the 4 stars.... I also used this on some of my planters, which have a base of clay soil, but I top up with compost. I applied this product and then worked the soils with a shovel and fork, turning it over and the results have been amazing. The soil has changed from a compacted clay to a crumbly workable soil in a matter of a could of weeks. Clearly this product does work, I’m just not convinced it will sort out a lawn in one treatment, but if you have an opportunity to work the soil after application it can have great results as I’ve seen. I’ll be applying this to my borders and planters again next year and will give the lawns a go again too.

Very fast service, Great Valley for

This helped break up the stubborn clay in my garden that could’ve doubled as pottery clay. After a few weeks of use, the soil started behaving like soil again – crumbly, airy, and actually drainable. Easy to apply and wind-resistant granules mean less wastage. If this helped improve your soil and your mood, go ahead and hit “Helpful”.

Would be better buying the liquid version

Arrived very quickly, had been recommended to buy this product to use on very heavy soil. Absolutely great results.

High quality and easy to spread. Used on lawn as we have so much clay. Hoping it will make a difference. May have to use a few more times to appreciate its full effect. Laid under compost with seeds to cover patches in grass.

This product is recommended by a lawn professional in their online videos, so I'm confident it'll make a difference on my garden, where there's some pretty thick clay. The granulated formula means it'll be easy to spread consistently using a hand spreader, and it should help my flower beds as well as the lawns. The price seems pretty reasonable for the weight. This seller also has some keenly priced fertiliser, so I may give that a go, too.