I had heard plants could communicate with one another by emitting chemicals. So plants have signs or a primitive language of sorts. It now seems that predatory plants have learned this language and can use it to determine where the prey plants are. This information is used to guide the predatory plant in the direction of the prey. In this case the predator is a weed called a dodder and the likely prey is a tomato plant. Here is the full article.

By the way I think the dodder makes a great lead-in to a story but I can’t figure out how best to integrate it. You may hear about it again if I can get some time this weekend to work on some notes I have.