One problem with acetone is it's pretty hygroscopic, so it will absorb water from the atmosphere or any plant material that's not bone dry. Then you're left wit

One problem with acetone is it's pretty hygroscopic, so it will absorb water from the atmosphere or any plant material that's not bone dry. Then you're left with water in the extract when the acetone is boiled off. Alcohols are worse as they form azeotropes with water. Also the more polar things (basically anything other than -ane) tend to extract sugars, pigments, etc. Saturated unsubstituted hydrocarbons (e.g. hexane) are really nice to work with, e.g. provide similar results to butane at room temperature/pressure. Heptane is nice because it can in principle be "natural" if sourced from Jeffrey pine oil, but I haven't seen that for sale...