Juniperus bermudiana is a small to medium-sized evergreen tree with small scale-like leaves. Trunk straight, with many branches in compact cone-shaped crown to 12 m high. Bark brown, furrowed into scaly ridges and peeling. Inner bark with dead brown outer layer, whitish, fibrous, resinous. Twigs four-angled, stout, more than 1.5 mm wide. Leaves paired, scalelike, overlapping in four rows against twig, blunt-pointed, 1.5 mm or more in length, with groove along back, gray green. Leaves on young plants in groups of 3, awl-shaped, to 13 mm long, those on older twigs in groups of 2, 3- angled, pointed, to 5 mm long. Trees male and female, the male (pollen-bearing) cones cylindrical, about 5 mm long. Female (seed-bearing) cones berrylike, rounded or slightly two-lobed, about 6 mm long, whitish blue, composed of few united scales, maturing in 1 year. Seeds 2– 3, egg-shaped, pointed, shiny brown, grooved. Sapwood is yellowish white, and the heartwood reddish brown (University of Hawaii at Manoa 2003).

The 'Critically Endangered ('CR') Bermuda juniper (see Juniperus bermudiana in IUCN Red List of Threatened Species) was formerly abundant in its native Bermuda but is now rare due to disease and felling.

Juniperus bermudiana produces wood of a fine-textured, aromatic, low density and durable quality. The wood is used in furniture, cabinetmaking and shipbuilding. In Hawaii, Bermuda juniper is grown as an ornamental and in hedges (University of Hawaii at Manoa 2003).

Juniperus bermudiana is a subtropical species (University of Hawaii at Manoa 2003).

The 15 non-pine conifers (out of 507 species) known to be invasive (seven in the Pinaceae; six in Cupressaceae, one in Araucariaceae, one in Podocarpaceae) are: Abies grandis, Abies procera, Araucaria araucana, Cryptomeria japonica, Juniperus bermudiana, J. communis, J. virginiana, Larix decidua, L. kaempferi (L. leptolepis), Picea sitchensis, Podocarpus falcatus, Pseudotsuga menziesii, Tetraclinis articulate, Thuja plicata and Tsuga heterophylla (Richardson & Rejmanek 2004).

Introduced plant species that are capable of displacing an endemic plant by dominating a particular site and altering ecological conditions, such as light, nutrients and moisture availability, have been described as \"severe threat species\" by Gray Pelembe & Stroud (2005). J. bermudiana falls into this category on Ascension; it is present in locations where the 'Vulnerable (VU)' endemic (see Sporobolus caespitosus in (IUCN Red List of Threatened Species) and the 'Near Threatened (NT)' fern (see Asplenium ascensionis in IUCN Red List of Threatened Species).