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Puerto Rico Palmetto, Puerto Rican Hat Palm

Sabal causiarum

Family: Arecaceae (ar-ek-AY-see-ee) (Info)
Genus: Sabal (SAY-bal) (Info)
Species: causiarum (kaw-see-AR-um) (Info)




Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


20-30 ft. (6-9 m)

30-40 ft. (9-12 m)

over 40 ft. (12 m)


10-12 ft. (3-3.6 m)

12-15 ft. (3.6-4.7 m)


USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Full Sun


Unknown - Tell us

Bloom Color:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer



Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Mobile, Alabama

Los Angeles, California

Thousand Oaks, California

Brandon, Florida

Venice, Florida

Augusta, Georgia

Natchez, Mississippi

North, South Carolina

Victoria, Texas

show all

Gardeners' Notes:


On May 8, 2004, IslandJim from Keizer, OR (Zone 8b) wrote:

This is a massive tree when it grows up. It's also a fairly fast grower. Not suited to planting anywhere but shopping centers, freeway islands, and industrial parks. The fans are much larger [almost as large as Bismarckia fans] than those of other Sabal palms I'm familiar with. We grew a few hundred of these and sold them mostly for freeway and shopping center plantings.


On Mar 3, 2004, palmbob from Acton, CA (Zone 8b) wrote:

One of the larger and faster growing Sabals- eventually ends up with a thick, concrete-like trunk 30 feet+ tall. But in So Cal there are none that tall (yet). This species tends to get symptoms of potassium deficiency easily (yellow to necrotic spots on leaves and yellow blanching of the older leaves). This has been the case with my own palms. The petioles develop a nice yellow-green hue, which looks nice to me, but is not a sign of health unfortunately. Fortunately most plants seem to grow along without any other untoward problems and eventually usually grow out of it. Not terribly unique as a young adult Sabal and I confess most Sabals look similar to me.