You have to pay hourly parking. Gardens are free to enter.
No other than parking
You have to pay for parking but they do have a "suggested" donation box in the greenhouse if you would like to donate. My donation was $10.00 because I didn't pay for parking and received a parking ticket 😏. Carma
No cost, except you pay to park. Also they have a gift shop and I am sure there is the opportunities to make donations, but nothing my family did cost anything extra.
Thanks! Your answer is awaiting moderation.