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At a Glance
TypeOrnamental grass
HabitSpreading
FoliageDeciduous
Height24-36 inches (60-90 cm)
Width24-36 inches (60-90 cm) per clump, spreading indefinitely
Maturity3 years
Overview
Ammophila breviligulata is American beachgrass — the foundation grass of Atlantic coastal dune ecosystems, growing 24–36 inches (60–90 cm) tall and spreading indefinitely by deep rhizomes. The genus name Ammophila spp. means 'sand-loving'. Blue-green upright tough narrow leaves and golden-tan dense spike-like panicles in midsummer. This species literally builds sand dunes: the tough foliage traps windblown sand, the deep rhizome network (extending 6 feet / 180 cm or more) anchors the accumulated sand, and the buried stems produce new shoots through the deposited sand, raising the dune surface over time. A single planting can create measurable dune growth within 2–3 years. The species requires pure sand and full sun — it actually declines in fertile garden soil, becoming susceptible to disease. Not a garden ornamental in the traditional sense — this is a functional ecological engineer planted for dune stabilization and coastal restoration. Hardy to zone 3 (also native to Great Lakes shores). Deer avoid the tough foliage.
Native Range
Ammophila breviligulata is native to eastern North America — the Atlantic coast from Newfoundland south to North Carolina, and Great Lakes shores.Suggested Uses
Used exclusively for dune stabilization and coastal restoration. NOT a traditional garden ornamental — requires pure sand and declines in garden soil. The ecological foundation of Atlantic dune ecosystems. Critical for coastal storm protection.How to Identify
Appearance
Size & Dimensions
Height2' - 3'
Width/Spread2' - 3'
Reaches mature size in approximately 3 years
Colors
Bloom Information
Flowering in July and August, approximately 4 weeks. Golden-tan dense spike-like panicles.Detailed Descriptions
Flower Description
Golden-tan, in dense spike-like paniclesFoliage Description
Blue-green, upright, narrow, toughGrowing Conditions
Sun Requirements
Requires 6-12 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight