 The roots readily send up suckers from below the graft, often allowing it to overtake the intended grafted rhododendron.Honey produced with pollen from the flowers of this plant can be quite poisonous, causing severe hypotension and bradycardia in humans if consumed in sufficient quantities, due to toxic diterpenes (grayanotoxins).In some parts of the world, a controlled dosage of the honey can be taken to induce hallucinations for spiritual or psychological purposes.