Definition
In law, "plant" refers to the collective physical infrastructure used to carry on a trade or business — specifically, the fixtures, tools, machinery, and apparatus that together constitute the operational equipment of a commercial or industrial enterprise. The term functions as a term of art in property, commercial, and tax law, describing not any single item of equipment but the aggregate physical means by which a business operates.
The legal definition carries several practical limits. Plant does not include property belonging to a separate business or enterprise operating on the same premises. Nor does it extend automatically to every asset associated with a business: early case law held that young fruit trees, for example, did not qualify, even where the surrounding operation might otherwise constitute plant. Conversely, courts have construed the term generously in context — a horse used in a wharfinger's business was held to constitute part of the plant, and a testamentary legacy of "plant and good will" was held to pass a business premises held under lease.
Common Language
Modern common usage (Wiktionary): An organism — typically a living, photosynthesizing, non-animal life form, such as a herb, shrub, or tree.
Historical common usage (Webster's 1913): A vegetable or organized living being generally without feeling and voluntary motion; a bush, sapling, or young tree; also, the sole of the foot (rare).
The gap between common and legal meaning is total and non-obvious. In ordinary English, "plant" nearly always refers to a living organism. In law, it refers to the physical apparatus of a business — machinery, fixtures, tools — and has nothing to do with biology. A researcher encountering the term in a contract, will, tax assessment, or commercial dispute should treat it as a term of art and not read the botanical meaning into it.
Common Confusion
Two recurring sources of confusion deserve notice. First, "plant" as business infrastructure must be distinguished from "fixtures," which refers more specifically to physical items permanently attached to real property and governed by distinct rules of law. Plant is a broader and more functional concept — it encompasses fixtures but also includes movable equipment and apparatus that might not satisfy the legal definition of a fixture. Second, in testamentary and conveyancing contexts, "plant" has been litigated as a term in legacy and devise clauses. Courts have not applied it uniformly, and what passes under a bequest of "plant" depends heavily on the circumstances of the particular business and the drafter's evident intent.
Why It Matters in Research
Researchers will encounter "plant" most often in three distinct legal contexts: tax law (depreciation and capital allowances), commercial and insolvency law (valuation of business assets), and testamentary/property law (what passes under a legacy or conveyance). The applicable meaning is consistent across these contexts in its core — the physical operating apparatus of a business — but the edges of the definition shift depending on what is at stake.
In historical sources, the definition is stated with apparent simplicity (fixtures, tools, machinery, apparatus), but the case law immediately surrounding it reveals the term was litigated extensively. Researchers using 19th-century American or English sources should watch for the distinction between plant as a going-concern concept and individual items of property assessed independently. The Bouvier's note that "plant" does not cover property forming part of a separate business is a quiet but important limitation — it surfaces in partnership disputes, business sales, and insolvency proceedings where multiple operations occupy shared premises.
The term also appears in the law of wills and estates in contexts that can seem counterintuitive. A testator who leaves "plant and good will" may inadvertently (or intentionally) pass leasehold premises, as courts have held. Researchers working with 19th- or early 20th-century wills that include the word should look carefully at surrounding context and jurisdiction before assuming a narrow reading.
In American jurisdictions, "plant" appears in regulatory and utility law to describe the physical infrastructure of regulated industries — telephone, railway, water, and electric utilities. This usage is consistent with the commercial meaning but has its own doctrinal development, particularly around rate-base calculations and depreciation schedules.
Historical Dictionary Support
The four source dictionaries are in close agreement on the core definition: fixtures, tools, machinery, and apparatus necessary to carry on a trade or business. Black's (both editions) and Rapalje & Lawrence all cite Wharton for this formulation. Bouvier adds nuance, noting limits on what the term covers (no separate business property) and offering examples of expansive judicial construction (the wharfinger's horse, the leasehold passing with a legacy).
None of the historical dictionaries address the regulatory utility sense of "plant," which developed later in rate-case law. Rapalje & Lawrence's entry is also notable for appending "PLANTATION" as a related sub-entry — in English law, a colony; in Southern American usage, a farm — signaling that the root word carried its own distinct legal freight in different geographical and historical contexts. Researchers working with antebellum Southern legal documents should not conflate "plantation" with "plant" in the business-infrastructure sense.
The 2nd edition of Black's includes case citations not present in the first, confirming the term was actively litigated and that the definition, while stable, required judicial elaboration at its margins.
Jurisdictional Note
American and English case law both use "plant" in the business-infrastructure sense, but English law developed the term most extensively in the context of capital allowances (tax depreciation), where it acquired a body of statutory and judicial gloss that has no direct American equivalent. American courts, particularly in utility regulation, gave "plant" a specific technical meaning in rate-base proceedings that differs from its general commercial usage.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Fixtures and Property Classification; Business Assets and Goodwill in Testamentary Law.