Ash = illegal substance
Beech = cast aspersions
Birch = landing spot for birds
Elder = hugs
Elm = nautical steering wheel
English oak = tradition summer weather
Fir = distant
Maple = tonight could be the night
Plane = youthful self-entertainment
Poplar = liked
Rowan = means of boat propulsion
Sycamore = perverse love
Willow = delayed payment
Yew = pronoun