https://www.scientificamerican.com/article/do-plants-think-daniel-chamovitz/

3. You say that plants have a sense of smell?
Sure. But to answer this we have to define for ourselves what “smell” is. When we smell something, we sense a volatile chemical that’s dissolved in the air, and then react in someway to this smell. The clearest example in plants is what happens during fruit ripening. You may have heard that if you put a ripe and an unripe fruit together in the same bag, the unripe one will ripen faster. This happens because the ripe one releases a ripening pheromone into the air, and the green fruit smells it and then starts ripening itself.

5. Do plants have a memory?
Plants definitely have several different forms of memory, just like people do. They have short term memory, immune memory and even transgenerational memory! I know this is a hard concept to grasp for some people, but if memory entails forming the memory (encoding information), retaining the memory (storing information), and recalling the memory (retrieving information), then plants definitely remember. For example a Venus Fly Trap needs to have two of the hairs on its leaves touched by a bug in order to shut, so it remembers that the first one has been touched. But this only lasts about 20 seconds, and then it forgets. Wheat seedlings remember that they’ve gone through winter before they start to flower and make seeds.