Tree terms: r
- rabbit
- rabbit damage
- rabbit fence
- rachis
- radial trenching
- radiation frost
- radicle
- raft
- raft (urban trees)
- rafter
- rail
- railing
- railway yard knotweed
- rain garden
- rain shadow
- rainwater goods
- raised bog
- ram’s-horn
- ramify
- Ramsar site
- ranch fencing
- rank
- ranker
- ray
- raywood ash
- RC
- reaction wood
- reaction zone
- rebar
- recalcitrant seed
- receptor
- recklessness
- reclaimed land
- recovery (ground movement)
- recovery (planning appeal)
- recovery growth
- recumbent
- recycled aggregate
- red band needle blight
- red deer (Cervus elaphus)
- red list
- red squirrel
- REDD
- redwood
- reflectance
- Regency gardens
- regeneration felling
- Regional strategy
- register of judgments, orders and fines
- register of land-based operatives (ROLO)
- register of parks and gardens
- registered consultant
- registered contractor
- registered social landlord
- regulated pruning
- regulating course
- reinforced concrete
- reinforced turf
- reintroduction
- relascope
- relative humidity
- relict
- remediation
- remedy
- render
- rendzina
- renewable energy
- Renewable Energy Association
- renewable heat incentive
- renewable heat premium
- renewable resource
- renewal pruning
- replacement planting
- replant disease
- repointing
- Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 1995
- reptile
- Repton, Humphry
- reserved matters
- resilience
- resin
- resin canal
- resin-bonded surface
- resin-bound surface
- resistograph
- resonant frequency
- respiration
- respondent
- restocking
- restoration ecology
- restoration pruning
- restricted byway
- resupinate
- retaining wall
- retention value (BS 5837:2012)
- retrenchment pruning
- reversion
- revetment
- rewilding
- RFS
- RFS Certificate in arboriculture
- RFS Professional diploma in arboriculture
- rhizome
- rhizomorph
- rhizosphere
- rhododendron
- RHS
- rib
- RIBA
- RICS
- RIDDOR
- ride
- ridge line
- rigg and furr
- right to light
- right to roam
- rights of common
- ring bark
- ring beam
- ring porous
- ring shake
- riparian
- riparian strip
- ripewood
- ripewood stem cutting
- risk
- risk assessment
- risk-based cost-benefit analysis
- riven
- riven fencing
- river basin
- RLR
- road planings (road scalpings)
- road safety
- rock flour
- rod
- rod brace
- rodding
- rodding eye
- roe deer (Capreolus capreolus)
- roll out
- ROLO
- roof garden
- roof light
- roof truss
- roofing felt
- root
- root anchorage
- root barrier
- root buttress
- root cage
- root collar
- root collar diameter
- root cutting
- root deflector
- root delamination
- root extension
- root exudates
- root flare
- root graft
- root heave
- root identification
- root impedance
- root path
- root plate
- root plate area
- root plate displacement
- root plate instability
- root pressure
- root protection area
- root pruning
- root regeneration potential
- root rot (infection)
- root rot, butt rot
- root spread
- root strangulation
- root suffocation
- root system
- root volume
- root-balled
- rooter (drains)
- rooter (engineering ripper)
- rooting depth
- rooting powder
- Root-out
- root-shoot junction
- root-shoot ratio
- rootstock
- rosin
- rot
- rotation
- rough shooting
- rough-cast
- roundel
- Round-up
- roundwood
- Royal charter
- Royal forest
- Royal Forestry Society
- Royal Horticultural Society
- Royal Institute of British Architects (RIBA)
- Royal Institution of Chartered Surveyors (RICS)
- Royal parks
- Royal Town Planning Institute (RTPI)
- RPA
- RTPI
- ruderal
- run-off
- rural land register
- Rural Payments Agency
- russet
- rust diseases
- RWG