Answer: I can find no retailers in California selling Hedera (ivy) of any type. I suspect that ivy has found its way onto the state's noxious weed list (it does tend to escape cultivation and cause problems). Since we can't find ivy for you, and you already have some, why not take tip cuttings from your established plants and root them in the area you want to plant? Ivy roots very easily in moist soil. Take 5-6" tip or stem cuttings and stick them into the soil so a leaf node is buried. Roots will develop at the node in just a few weeks.
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