The grounds are free. There are ticketed events.
It is free to tour the gardens. Assuming you arent parking on sonoma ave side during the week.its then metered to park. (There is no formal parking lot for Luthers house) However there are ticketed and fundraising events sometimes held to raise support funding such as the plant sale and open house. Also a guft shop. See website for dates of those events.
It was free when I was there in May
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