Are both Nerium or Thuja could be a shrub?
Nerium Nerium oleander is a shrub or small tree in the dogbane family Apocynaceae, toxic in all its parts. It is the only species currently classified in the genus Nerium. It is most commonly known as nerium or oleander, from its superficial resemblance to the unrelated olive "Olea". It is so widely cultivated that no precise region of origin has been identified, though southwest Asia has been suggested. The ancient city of Volubilis in Morocco may have taken its name from the Berber name "oualilt" for the flower. Oleander is one of the most poisonous commonly grown garden plants.
Rhododendron arborescens Rhododendron arborescens, also known as smooth azalea or sweet azalea, generally blooms in late spring and early summer. They are named sweet azalea after their sweet-scented aroma. The flowers range in color from white to pink with red stamens. Their leaves can also become deep red to purple in the fall. This plant, indigenous to the United States, is generally found growing near moist areas or streams. The plant prefers growth in acidic soil with a pH of 6.8 or less. It grows best in sandy soils above 3000 feet. Their flowers are also known to contain poisonous substances and must not be consumed by wild animals or humans. The effects of consuming this plant include depression, vomiting, diarrhea, difficulty in breathing, and most dangerously coma.