There isn't a specific word for a plant that has died. We simply say it is dead or deceased.

However, there are some terms related to a plant's death or its state after death:

* Decomposed: This refers to the process of breaking down the plant matter by microorganisms.

* Withered: This describes a plant that has dried up and shriveled due to lack of water.

* Rotting: This describes the decay of a plant due to the action of bacteria and fungi.

* Compost: This refers to the organic matter that results from the decomposition of plant and animal material.

So, while there isn't one specific word for a dead plant, there are various terms that describe the process of death and the resulting state of the plant.