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Gardening in serpentine soil

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Question

I live on Potrero hill with serpentine rock. How does this affect my plants? What can/can't I grow?
Camilla
San Francisco

Answer

Serpentine soils tend to be more alkaline and contain higher levels of heavy metals such as nickel and are very high in magnesium but poor in calcium. It is not that serpentine soils are toxic, but that an acidifier such as FST be added if acid loving plants are wanted and that calcium, in the form of gypsum is used to provide that needed element. Many of our serpentine soils have become more acidic in the top layers due to the constant leaf fall from pine, redwood, bay and oak. What you can grow will depend on exposure more than anything else. Look at the areas you want to plant and measure the amount of direct sun they get (if any). Look around your neighborhood and identify those plants that you like that thrive. Take that information, as well as names of some other plants that you like and visit the store on Sloat. One of our qualified team members would be happy to make and show you suggestions.

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