Driftwood is the most visually prominent material that accumulates at the tideline, but it arrives in company. A careful walk along a BC or Nova Scotia beach at low tide reveals a range of inorganic and organic materials, each with different working properties, different collection considerations, and different roles in nature-based compositions.
Sea Glass
Sea glass originates as broken glass — from bottles, jars, or vessel cargo — that has been tumbled in salt water and beach gravel long enough to lose its sharp edges and acquire an opaque, frosted surface. The frosting is the result of a slow chemical reaction between the glass's silica and the slightly alkaline saltwater, a process that produces a micro-etched surface layer distinct from ground or sandblasted glass.
On Canadian beaches, sea glass is most concentrated near historic port areas and former industrial sites. In the Maritimes, beaches around Pictou County in Nova Scotia, the Northumberland Strait shore, and parts of the Saint John River estuary have well-documented sea glass accumulations. On the BC coast, areas near historical cannery sites and early settlement harbours tend to yield older, more thoroughly frosted pieces in a wider range of colours.
Colour and Age
The colour of sea glass reflects the colour of the original glass, which shifts over time with changes in glass manufacturing. The most common colours found today — white, green, and brown — correspond to bottle glass in wide use through most of the 20th century. Cobalt blue, aqua, and red are rarer because those colours were used less frequently and because coloured glass tends to weather differently. Very old glass from pre-industrial sources sometimes shows a purple or amethyst tint caused by manganese oxidation.
Working Properties
Sea glass is most often used as a surface element — set into resin, wire-wrapped, embedded in cement or plaster, or simply arranged. Its frosted surface does not adhere well to most adhesives without surface preparation; etching the contact area or using a two-part epoxy formulated for glass gives better results than contact cement or cyanoacrylate. When drilling is required (for wire suspension), a diamond-tipped drill bit run at low speed with continuous water cooling produces clean holes without cracking.
Shore Stone and Pebble
The smooth rounded stones found on gravel beaches are shaped by the same abrasion process that rounds driftwood — wave action working over long periods. On the BC coast, beaches with mixed geological origins often yield stones of considerable variety: basalt, granite, sandstone, and serpentinite can all appear on the same beach depending on the watershed geology.
In practical terms, shore stones are heavy relative to their visual volume, which affects any mounted composition significantly. A collection of beach stones that looks modest spread across a studio floor can add 15–30 kg to a wall-mounted piece, requiring appropriate backing material and anchoring. Shore stones that have dried fully in a studio environment may show surface crazing if their mineral content includes clay fractions that contract as moisture leaves — this is most common with softer sedimentary stones from fine-grained formations.
Kelp and Marine Plant Material
Bull kelp (Nereocystis luetkeana), which grows along the BC coast from Alaska to northern California, produces blades and stipes that wash ashore in large quantities after storms. Fresh-stranded kelp is not immediately usable in most applications — it has high water content and a strong odor as it begins to decompose. Dried properly, however, the stipes and bulbs of bull kelp become rigid, lightweight, and develop a papery texture that can be shaped and cut.
Drying marine plant material requires good air circulation and patience; forced heat tends to produce cracking and brittleness, while ambient drying over several weeks in a ventilated space gives more consistent results. Dried kelp blades become extremely fragile and are generally used only in protected indoor installations. The stipes and bulbs are more durable and have been used as structural elements in small-scale assemblages.
Shell Material
Shell accumulates on Canadian beaches both as fresh-deposited material and as weathered fragments from older shell middens and reef systems. The most useful shell for nature-based art tends to come from the weathered category — pieces that have been exposed long enough to lose the periostracum (the organic outer layer) and develop the chalky white or cream appearance associated with beach-worn shell.
Oyster shell, mussel shell, and clam shell are the most common types on both coasts. Oyster shells from BC's Georgia Strait have large, irregular forms with good surface texture. Mussel shells, though smaller, have a distinctive iridescent interior that retains some colour even in weathered specimens. Clam shells are the most uniform in shape and the easiest to work with for precise placement.
Collection Regulations
The collection of shell material is regulated in Canada's national parks and many provincial parks. On First Nations territories — a significant portion of BC's coastal zone — collection of any material including shell requires explicit permission from the relevant Nation. Shell middens, which appear as white-tinged accumulations in beach banks and eroding bluffs, are protected archaeological sites under the BC Heritage Conservation Act and federal legislation; no material should be removed from them under any circumstances.
Combining Materials
Nature-based compositions that mix driftwood with stone, glass, and shell deal with significant differences in weight distribution, moisture sensitivity, and dimensional stability. Wood continues to expand and contract with humidity changes; stone, glass, and shell do not. Assemblages that attach non-wood elements directly to wood with rigid adhesives often develop cracks at the joint over time as the wood moves. Using flexible adhesives, mechanical fasteners, or designing the joint to allow independent movement extends the lifespan of mixed-material pieces considerably.
The article on driftwood sculpture techniques addresses fastening approaches in more detail, including options for attaching heavy stone elements to wood structural members.
Sources consulted: BC Ministry of Forests publications on coastal drift ecology; Fisheries and Oceans Canada species database; BC Heritage Conservation Act (RSBC 1996); Natural Resources Canada geological survey data for coastal British Columbia.