Bare-Root, Container, and Caliper – When to Use Each
Beyond species selection, the type of nursery stock specified—whether premium field-grown bare-root seedlings or RPM-produced container stock—directly affects installation efficiency, project costs, survival rates, and long‑term performance. At Forrest Keeling Nursery, both types of stock are produced to strict standards, with careful attention to root growth, plant health, and appropriate regional seed sourcing. Knowing when to use each—and when to combine them—helps project teams manage budget, risk, and performance expectations effectively.
Premium Field-Grown Bare-Root Seedlings
Maximize Coverage, Minimize Cost per Acre
For projects measured in acres rather than individual trees, Forrest Keeling’s premium bare‑root seedlings offer excellent value. Grown under field conditions in raised beds and harvested during dormancy, these seedlings provide an efficient, budget‑friendly solution for reforestation, riparian buffers, mitigation banks, and large conservation planting efforts.
Bare‑root seedlings offer:
- Lowest plant cost per acre
- Fast installation with hand crews or mechanical planters
- Efficient shipping and handling (high plant counts per pallet)
When handled correctly—kept moist, planted at the correct depth, and installed on well‑prepared sites—bare‑root seedlings establish quickly and perform reliably. Many well‑managed projects aim for 70% first‑year survival, with higher rates possible under ideal conditions and attentive aftercare.
Bare‑root stock is best suited for:
- Large‑scale restoration and mitigation
- Accessible sites with workable soils
- Projects where initial cost is the primary driver
RPM-Produced Container Stock
Reliable Performance in Challenging Sites
Forrest Keeling’s patented RPM (Root Production Method®) produces container-grown plants with dense, fibrous root systems created through air-root pruning and a proprietary multi-step production process. These root systems promote quick lateral root development, strong root-to-soil contact, and better water and nutrient uptake after planting.
Compared to bare‑root stock, RPM container plants typically cost more per plant and require more shipping space, but they provide greater consistency in establishment and survivability.
On compacted soils, steep slopes, flood-prone areas, urban environments, or locations where replanting is expensive, RPM container stock can offer reliable performance. Properly installed RPM plants often achieve survival rates of 95% or higher when proper installation and maintenance practices are followed.
RPM container stock is the best choice when:
- Site conditions are challenging
- Performance standards are strict
- Early establishment and regeneration matter
- Access limits repeat planting
Larger Caliper Trees
Selective Use for Immediate Impact
Larger caliper trees offer immediate visual impact and canopy coverage, making them popular choices for streetscapes, parks, campuses, and civic spaces. Although they provide instant presence in highly visible areas, they also come with the highest installation costs and typically require equipment access and dependable irrigation during establishment.
For most restoration and conservation projects, caliper trees are best used selectively—as focal points—rather than as the primary planting stock. Forrest Keeling produces many species in a range of caliper sizes.
The Best Strategy: Combine Stock Types
Many top‑performing projects rely on a blended approach:
- Premium bare‑root seedlings for economical coverage across large areas
- RPM container stock for higher survival and performance
- Limited caliper trees for entrances, trailheads, or signature spaces
Choosing the right combination helps balance budget, risk, and long‑term performance. At Forrest Keeling Nursery, we grow hundreds of native and specialty tree and shrub species in bare‑root, RPM container, and caliper formats—so project teams can source the right plant, in the right form, for the right place. Our staff works with designers, contractors, and project managers to align plant material with site conditions, performance standards, and long‑term project goals.
