An odd point to make, but interestingly enough - some plants kind of do!

Many (most) plants interact in astounding ways with fungi. In some instances the plant will parasitize the mycorrhizae of the fungi, in others the fungi will parasitize the plant.

There are instances where both of these organisms benefit from their interaction.

As an example, some coniferous plans (think pine trees), actually utilize mycorrhizal sheets to distribute resources (nutrients / energy / water) to younger trees who aren't receiving enough light through the canopy of the forest - this helps sustain them until the larger / older trees fall down.