Types of Nursery Stock Used in Landscaping Projects

Nursery stock encompasses the full range of living plant material supplied by growers and wholesalers for installation in residential, commercial, and public landscapes. The category spans trees, shrubs, groundcovers, grasses, perennials, and annuals, each available in distinct physical forms that affect handling, establishment, and cost. Understanding how stock types are classified helps contractors match procurement decisions to site conditions, project timelines, and budget constraints. This page covers the primary classification system used across the US nursery trade, the practical mechanisms behind each form, and the decision logic for selecting among them.

Definition and scope

Nursery stock, as defined by the USDA Animal and Plant Health Inspection Service (USDA APHIS), includes all plants grown for transplanting, including trees, shrubs, vines, ornamental plants, and propagating material such as cuttings and budwood. For landscaping purposes, the working definition narrows to finished or near-finished plant material intended for direct installation.

The scope of the category is substantial. The USDA National Agricultural Statistics Service (NASS) 2019 Census of Horticultural Specialties reported nursery and greenhouse crop sales of approximately $13.8 billion across US operations. Landscape contractors draw from this supply pool through wholesale nurseries, grower-direct arrangements, and regional brokers, as explored in plant sourcing for landscaping contractors.

Stock is classified primarily by how it is harvested or grown for sale. The three dominant physical forms are:

  1. Balled and burlapped (B&B) — field-grown plants dug with a soil ball retained around the roots and wrapped in natural or synthetic burlap
  2. Container-grown — plants cultivated and sold in rigid plastic or fabric containers
  3. Bare root — plants harvested during dormancy with soil removed from the root system

Secondary classifications layer on top of these forms, including pot-in-pot production, tree spade–dug specimens, and plug-grown material. State-level regulatory treatment of each form is addressed under nursery licensing and certification requirements by state.

How it works

Balled and burlapped (B&B) stock is field-grown for a minimum of two to five growing seasons before harvest. At dig time, a mechanical tree spade or hand crew excavates a root ball whose diameter is sized to the trunk caliper or stem spread, following American Standard for Nursery Stock (ANSI Z60.1) guidelines published by the American Horticulture Industry Association (AmericanHort). ANSI Z60.1 specifies, for example, that a 2-inch caliper shade tree requires a minimum root ball diameter of 20 inches. The retained soil protects fibrous roots and moderates transplant shock, but adds significant weight — a 3-inch caliper tree in a B&B ball can weigh 300 to 400 pounds, requiring mechanical handling on site.

Container-grown stock is produced entirely in a controlled growing medium, typically a bark-based soilless mix, inside plastic or fabric containers ranging from 1-quart liners to 300-gallon fabric bags for large specimens. Because roots remain intact within the container, transplant shock is reduced, and installation windows extend across most of the growing season. Container stock is the dominant form in the US retail and wholesale nursery trade for shrubs, ornamental grasses, perennials, and annuals. More detail on installation mechanics appears at container-grown plants in landscaping.

Bare root stock is harvested during dormancy — typically late winter to early spring — after the plant has shed its leaves and metabolic activity is minimal. With no soil mass to transport, freight costs drop substantially compared to B&B equivalents. Roses, fruit trees, and deciduous shade trees are the most common bare-root categories. The installation window is narrow: bare-root material must be planted before bud break, generally a four- to eight-week period depending on USDA Plant Hardiness Zone. Full treatment of this form is at bare root plants for landscaping projects.

Common scenarios

Large-scale commercial tree installation almost exclusively relies on B&B or tree spade–dug specimens. Specifying engineers reference ANSI Z60.1 caliper-to-ball ratios, and project timelines typically account for a 90- to 120-day lead time for field digging. For oversized specimens above 6-inch caliper, sourcing shifts to specialty growers covered under large specimen tree sourcing and installation.

Residential landscaping projects with moderate budgets favor container stock for shrubs, ornamental grasses, and perennials. A standard residential shrub border using 3-gallon container plants allows same-day planting from nursery delivery, with establishment care extending through the first two growing seasons as described in post-installation plant establishment care.

Municipal revegetation and restoration projects increasingly specify native plants in US landscaping services, which may arrive as bare-root whips, 4-inch plug trays, or container stock depending on the species and planting season. Plug-grown native forbs and grasses offer lower per-unit costs than container stock, making them practical for high-quantity restoration plantings measured in thousands of units per acre.

Decision boundaries

Selecting among B&B, container, and bare-root forms involves four primary variables:

  1. Species and size — Large-caliper deciduous trees are most reliably sourced as B&B shrubs and perennials as container; dormant roses and bare-stemmed fruit trees as bare root.
  2. Installation season — Container stock installs across the full growing season; B&B installs optimally in spring or fall; bare root requires dormant-season installation only.
  3. Site logistics — B&B stock demands crane or forklift access for specimens above 2-inch caliper; container stock is manageable by hand up to 15-gallon size; bare root has no special equipment requirement.
  4. Budget and availability — Bare root is lowest cost per unit for compatible species; container stock carries a production premium but offers flexibility; B&B commands the highest price, justified by size and root protection. Pricing mechanics are explored in nursery plant pricing models for landscaping bids.

B&B vs. container: a direct contrast. A 2-inch caliper red maple (Acer rubrum) in B&B form typically weighs 250 to 350 pounds and requires a two-person crew plus equipment; the same species in a 25-gallon container weighs roughly 60 to 80 pounds and can be moved by two workers without mechanical assist. The B&B specimen, however, often carries a more developed trunk taper and a larger effective root zone, producing faster canopy establishment in the first three years after installation.

Regional nursery stock availability by US climate zone provides zone-specific guidance on which forms and species are reliably stocked by wholesale suppliers across the continental US.

References

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