The Yellow Karan, or Yellow Oleander (Cascabela thevetia), is an ornamental evergreen shrub or small tree known for its bright yellow, funnel-shaped flowers and glossy green, lance-shaped leaves. It's a hardy, low-maintenance, and drought-resistant plant that thrives in full sun and warm climates, blooming throughout the year. However, all parts of the plant are highly toxic and can be poisonous if ingested