Leucothrinax morrisii

Brittle Thatch Palm, Key Thatch Palm

Countries Of Origin: Bahamas, Cuba, Haiti, Leeward Islands, Puerto Rico, United States

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About Leucothrinax morrisii

This species flourishes in exposed limestone outcrops, sandy soils, and coastal scrub, tolerating drought, salt spray, and hurricane-force winds with remarkable ease.  The palm develops a slender, solitary trunk crowned by a compact canopy of nearly circular, costapalmate leaves. Their blue-green upper surfaces contrast beautifully with their pale gray to silvery undersides, giving the crown a distinctive shimmer as the leaves move in the breeze. This subtle coloration inspired the genus name Leucothrinax, derived from the Greek leuco- meaning "white," a reference to the palm's gray-white foliage.  Previously classified as Thrinax morrisii, advances in molecular genetics reshaped our understanding of its evolutionary relationships. In 2008, botanists Dr. Scott Zona and Dr. Carl Lewis established the genus Leucothrinax after DNA studies demonstrated that Thrinax morrisii did not group with the remaining Thrinax species. Instead, it represented a distinct evolutionary lineage deserving recognition as its own genus. Small, creamy-white flowers emerge on branched inflorescences extending beyond the crown, followed by nearly spherical white fruits that gradually mature to ivory. These fruits provide food for birds and other wildlife throughout the Caribbean.

Climate Zone 10b
Min Temp (F/C) 35 to 40 F / 2 to 4 C
Leaf Type Palmate
Growth Rate Slow
Conservation Status
Least Concern
Habit Solitary
Soil pH 7.0-8.0 (Neutral to alkaline)
Soil Type Rocky / Limestone

Cultivation Tips

Easy to grow, this species thrives in full sun once established and prefers excellent drainage. It performs exceptionally well in alkaline limestone soils but adapts readily to sandy and rocky substrates. Young palms appreciate occasional irrigation during establishment, while mature specimens become highly drought tolerant.  Its outstanding tolerance of salt spray, coastal winds, and prolonged dry periods makes it an excellent choice for seaside landscapes where many palms fail. Growth is slow to moderate, rewarding patient growers with an elegant, low-maintenance specimen that requires little pruning beyond the removal of naturally aging leaves.  Feed occasionally during the growing season with a high quality palm fertilizer.

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