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amendments to clay soil for new plants #930850

Asked May 06, 2026, 5:18 PM EDT

I am installing ornamental shrubs (California lilac) in backyard. The area I am digging is solid, thick clay. Can you recommend amendments to add to new soil to aid in the success of these plants, which will have a south/west exposure.

Marion County Oregon

Expert Response

Thank you for your question, David.  This resource should provide all the answers you need:  https://extension.oregonstate.edu/catalog/ec-1561-improving-garden-soils-organic-matter

Good luck!
An Ask Extension Expert Replied May 07, 2026, 2:56 PM EDT

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