I managed to find the ends of its knowledge.

• it has scarce knowledge about decorative plants such as Anthurium King of Spades - this is an expensive plant in EU, about 200-300 EUR.

• it has fuzzy/no knowledge about a hotel resort I visited last summer in Greece.

So there are obscure plants and points of interest that are outside its closed-book ability to remember. It doesn't literally remember everything. Other than that, it's amazing.