Oxalis regenllii 'Triangularis' (aka Oxalis triangularis) - The well-known Purple Shamrock is beautiful in borders or pots with its sharp-angled triangular leaves set in threes per leaf stem. Centers of the leaves are pink-red-purple while the edges are purple-black. Delicate clusters of funnel bell flowers are pink to lavender pink and erupt through the growing season – even longer when grown as a windowsill plant. It's easy and worthy. Plant in fertile but draining soil. Keep it drier in winter if grown indoors. Full to part sun. Full pots from divisions.