I will visit the mute giants, the residents of the castle, and anyone else I meet to plan for a massive trick, where Ravana finds the Gardens empty.
We'll prepare hidden bunkers, which may eventually be screened with further help from the DM. We'll lay in supplies, weapons, and connections to the outside world. We'll be far from the known transmitters: Earnaness' spawn's, the Sslugs, maybe places where the Trickster has been?
Maybe I can enlist @Tiger Henge and @Volatilus to help make plants cover everything as though we've been away a while?
The contingency plan is, should a hostile Ravana arrive, to be able to present a Garden abandoned out of fear. I will volunteer to stay aboveground as a terracotta gardener allegedly responsible for maintaining things that need maintained.