I forgot to declare the fruits ownerless during the Shemitah

I have fruit trees in the garden - lemons and oranges, and I forgot to declare them ownerless during the Shemitah. What should I do?

Declare them ownerless now, the fruits growing on the tree set before Rosh Hashanah, so they are still sanctified with the sanctity of the Shemitah year, and there is still an obligation to declare them ownerless until the yield that set after Rosh Hashanah arrives [in most cases, these will be the fruits of the next season].

Rambam (Shemitah, Chapter 4).

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