how to plant Leucadendron

My daughter is planting 20 Leucadendron. She has done extensive research about how to plant them in her clay soil, however everyone seems to have a different answer. Several people have told her to increase drainage by planting in decomposed granite (DG) and native soil; others suggest that she not amend; while some say to treat the plants like any other and amend with pumice and planting mix. She was favoring the DG method until she was told that the DG would turn to cement in a year or two.

Please help. My daugher lives near in Southern California in Highland Park.

Ellen Hoffs
Santa Monica, CA

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