Rhapidophyllum hystrix aka Needle Palm

Rhapidophyllum hystrix, or needle palm, belongs to the palm family. People also call it porcupine palm and blue palmetto. It comes from the southeastern United States. Its range takes in Alabama, Florida, and Georgia. It also grows in Mississippi and South Carolina. Wild plants grow on floodplains and swampy ground over limestone. This palm stays green all year and forms dense, round clumps. It spreads through suckers, shoots that grow from its base.

Growth is slow, and sources give a range of garden sizes. North Carolina State gives heights of 3–6 feet [0.9–1.8 metres]. It lists widths of 4–8 feet [1.2–2.4 metres]. RHS gives both height and spread near 5 feet [1.5 metres]. The short, thick trunk may stand upright or lean. Old leaf sheaths coat the trunk's dark reddish-brown surface. Black spines reach 0.5–0.8 feet [0.15–0.25 metres] long. The shiny, fan-shaped leaves have dark green tops. Their lower sides are silver-grey. Each leaf can span 2.5 feet [0.76 metres]. Deep cuts split the blade into narrow, stiff parts.

Small groups of flowers sit near the trunk, below the leaves. Sources give their colour as yellow-brown or purple-brown. The palm blooms in spring and early summer. Missouri Botanical Garden lists June–July as its bloom time. The flowers add little to the show but draw pollinators. Small, fuzzy, reddish-brown fruits ripen near the trunk in autumn. These fruits are drupes, with a stone inside. Fibres and sharp spines grow around them. They smell bad, but bears and other mammals eat them. The clumps also give wild animals shelter.

Needle palm grows best in rich, damp soil that drains well. It accepts wet soil and, once settled, copes with drought. Part shade suits it best, though it also accepts sun. RHS also says it can grow in full shade. It can grow in clay, loam, and sand. RHS lists acid, neutral, and alkaline soils as suitable. Sources place it in USDA zones 6–10; NCSU specifies 6b. RHS rates it H6. Shelter from cold winds helps protect the plant in winter. Mulch over the roots can also help it withstand winter cold.

Use this palm as a specimen, border accent, or container plant. Its bold leaves add texture and interest in winter. Sources report few serious problems with pests or disease. RHS says it needs no pruning. Seeds may take six to twelve months to sprout. The spines make suckers hard to divide and can hurt handlers. They also make plants hard to move once settled. These spines pose a risk of harm to people and animals.