A famous houseplant, known for its ease of growth and flowering, the Crown of Thorns has graced windowsills for over a century with bursts of color while tolerating blind neglect. This dwarf form has flowers that populate the spiny stems yet it stays compact making it the perfect potted plant for windowsills. For success in culture remember to allow the soil to dry out between watering, give it a sunny location, and it’s as fool proof as any.