QUESTION RE FILIPPI'S PLANTING INSTRUCTIONS

I'd like to follow Filippi's planting and watering instructions when I plant
several dozen Cistus salviifolius prostratus along the bottom edge of a long
(150') slope bordering our property.

In spite of good drainage due to the slope, I wonder if our native clay soil
will drain well enough for me to use the deep planting holes Filippi
recommends.  Further, I foresee the watering basins his plans require - made
of soil around each plant - will quickly be demolished, if not by natural
erosion then by the hooves of the local deer herd.

Has anyone in the San Francisco Bay Area used Filippi's planting suggestions
on a steeply sloping site?

I'd be grateful for any advice or experience you'd care to share.

Thank you.

Sylvia Sykora
Oakland, CA
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