What's the problem with groves?

In Exodus 34:13, Deuteronomy 7:5, Deuteronomy 12:3, God states laws against idolatry, and God says to cut down or burn groves: > **Exodus 34:13 KJV** > But ye shall destroy their altars, break their > images, and **cut down their groves**: > **Deuteronomy 7:5 KJV** > But thus shall ye deal with them; ye shall > destroy their altars, and break down their images, and **cut down their > groves**, and burn their graven images with fire. > **Deuteronomy 12:3 KJV** > And ye shall overthrow their altars, and break > their pillars, and **burn their groves** with fire; and ye shall hew down > the graven images of their gods, and destroy the names of them out of > that place. Some kings, fighting against idolatry, accomplished that commandment, like Hezekiah : > **2 Kings 18:4 KJV** > He removed the high places, and brake the images, > and **cut down the groves**, and brake in pieces the brasen serpent that > Moses had made: for unto those days the children of Israel did burn > incense to it: and he called it Nehushtan. In my native language (portuguese), "grove" is translated as a "forest". So I thought: What's the problem with some trees? What's related to idolatry on groves? Using **strong**, the "grove" word is **H842** (happy; asherah (or Astarte) a Phoenician goddess; also an image of the same). God was fighting the idolatry about that goddess?