Yes thank you, that makes it a lot more clear. I thought that none of the blue tiles could overlap with the ones from the plants you have already placed. And it is quite difficult to remember which tiles are already occupied (blue) by the plants that are placed, so I thought it would be helpfull if the player can see which tiles are already occupied. But how do you know which plants are toxic to each other and which one aren't?
They are toxic to each other when they have different stems. Think of it as chess, pieces of the same color (stems in the case of symbiosis) cannot kill each other. I didn't have time to implement a feature that shows affected tiles by a plant when you mouse over it, the best way to check that would be by replanting the seed or memorizing the patterns, which are pretty simple. There's only 3 different flowers in the game so the player would only need to learn 3 patterns (the eye flower affects all tiles in the same row and column, the diamond flower affects tiles diagonally and the carnivore flower forms a ring).