Glossary

Definitions & Explanations
A
Abiotic
Abscisic Acid (ABA)
Accessible Gardening
Acclimatization
Action Bias
Adjusted Light Level
ADP (Adenosine Diphosphate)
Adventitious Roots
Aeration
Aerenchyma
Aerial Root
Aerobic Composting
Aerobic Respiration
Aeroponics
Aerotropism
Agronomic
Air Filled Porosity (AFP)
Air Layering
Air Pore Space
Air Pruning
Allelopathy
Amorphous Silica
Amphiphilic Solvent
Anaerobic
Anaerobic Composting
Annual
Anoxia
Anther
Anthocyanin
Anthracnose
Ants
Aphids
Apical Dominance
Apical Growth
Apple Scab
Aquaponics
Aroid Plants
Asexual Reproduction
ATP (Adenosine Triphosphate)
Attribution Error
Auxin
Availability Heuristic
Axil
B
Bacillus subtilis
Bacterial Canker
Balanced Fertilizer
Bare Root
Basal Rot
Base Light Tier
Base Light Tier
Beneficial Insects
Biennial
Biochar
Biodegradable
Biodiversity
Biological Nitrogen Fixation (BNF)
Biostimulant
Birds
Blade
Blight
Bloom
Blossom
Bokashi Composting
Bolting
Botrytis
Boundary Layer
Bract
Bromeliads
Brown Rot
Bulb
Bulbil
C
C3 Plants
Cabbage Worms
Calvin Cycle
Calyx
Candlepower (Candela)
Canopy
Capillary Action
Carbon Balance
Carbon Deficit
Carbon Dioxide (CO₂)
Carbon Gain
Carbon Matrix
Carbon Sequestration
Carbon Sink
Carbon Skeletons
Carbon-Nitrogen Ratio
Category Error
Caterpillars
Cation
Cation Exchange Capacity (CEC)
Caudex
Ceramic Metal Halide (CMH) Grow Lights
Chelated Nutrients
Chemotropism
Chimney Etiolation
Chip on Board (COB)
Chlorophyll
Chloroplast
Chlorosis
Circulating System
Citrus Canker
Clubroot
CO2 Enrichment
Coco Coir
Cognitive Bias
Cold Composting
Cold Frame
Color Temperature
Colorado Potato Beetles
Common Name
Compaction
Companion Planting
Compost
Compost Activator
Compost Bin
Compost Pile
Compost Tea
Compost Turner
Container Gardening
Coppicing
Corm
Cormel
Corn Earworms
Corolla
Cotyledon
Crassulacean Acid Metabolism (CAM)
CRI (Color Rendering Index)
Crop Rotation
Cross-Pollination
Crown
Cryptochromes
Cultivar
Cuticle
Cuticular Transpiration
Cytokinins
D
Daily Light Integral (DLI)
Damping Off
Dappled Shade
Deadheading
Decomposition
Deep Mulching
Deep Water Culture (DWC)
Deer
Desiccation
DLI Classification
Dormancy
Downy Mildew
Drip System
Dry Rot (Roots)
Dry-Down
Dry-Down Cycle
E
Ebb and Flow
Ecosystem Services
Edging
Edible Landscape
Efflux Transporter
Electrical Conductivity (EC)
Endodormancy
Endosperm
Epicotyl
Epicuticular Wax
Epiphyte
Erosion Control
Espalier
Etiolation
Eutrophication
Evapotranspiration (ET)
Everw​et
F
Failure State
Falloff
Feeder Roots
Fertilization
Fertilizer
Fertilizer Form
Fibrous Roots
Field Capacity
Filament
Fine Fraction Limit
Finished Compost
Flea Beetles
Floral Anatomy
Floret
Fluorescent Grow Lights
Foliar Feeding
Forest Gardening
Frost Heave
Full Spectrum
Fungal Hyphae
Fusarium Wilt
G
Garden Frame
Gas Exchange
Genetic Diversity
Gibberellins
Grafting
Gravitropism
Green Manure
Greenhouse
Grow Light
Grow Mix Porosity Tier
Grow Mix Stability
Grow Tent
Growth Behaviour
Growth Form
Growth Medium
Guild
H
Harden Bulb
Hardening Off
Hardiness Zone
Hardscape
Hemi-Epiphyte
High-Intensity Discharge (HID) Grow Lights
Homologues
Horticultural Therapy
Hot Composting
Hot Spot
Hugelkultur
Humic Acid
Humidity
Humus
Hybrid
Hydraulic Capacity
Hydroculture
Hydrophobicity
Hydrotropism
Hygrometer
Hygroscopic
Hypocotyl
Hypoxia
I
IBA Rooting Hormone
Indigenous Knowledge
Indigenous Plants
Indoor Gardening
Indoor Risk Profile
Indoor Tropical Plants
Inert Media
Inflorescence
Influx Transporter
Inorganic Fertilizer
Intensive Gardening
Internode
Interveinal Chlorosis
Invasive Species
Inverse Square Law
IR (Infrared)
Isopropyl Alcohol (IPA)
J
Japanese Beetles
Jump Starting
Juvenile Growth
K
Kelp Fertilizer
Keyhole Garden
Kneeling Pad
L
Lateral Shoot
Leaching
Leaf Abscission
Leaf Miners
Leaf senescence
Leaf Spot
Leafhoppers
LED Grow Light
Light Bleaching
Light Compensation Point
Light Requirements
Lignification
Lignifies
Lignin
Loam
Low Carbon Gain
Lumens
Lux
M
Macronutrients
Macropores
Margin
Maximum Light
Mealybugs
Mel Bartholomew
Meristem
Mesophyll Cells
Metabolically Active Tissue
Microbial Mineralization
Microclimate
Micronutrient Deficiency
Micronutrients
Midrib
Millimolar
Minimum DLI for Maintenance
Minimum Light (PPFD)
Minimum Sustaining PPFD
Mitochondria
Moisture Gradient
Montane Habitats
Motile Spores
Mucilage
Mulch
Mulch Volcano
Mulching
Mycelium
Mycorrhizae
N
N-P-K Ratio
NAA Rooting Hormone
NADH
NADPH (Nicotinamide Adenine Dinucleotide Phosphate)
Native Plants
Natural Pest Control
Nectar
Net Pot
NIR (Near-Infrared)
Nitrate (NO₃⁻)
Nitrate Reductases
Nitrogen (N)
Node
Non-Toxic Pest Control
Normalcy Bias
NPK Ratio
Nutrient Cycling
Nutrient Demand
Nutrient Film Technique (NFT)
Nutrient Leaching
Nutrient Limitations
Nutrient Solution
Nutrient Toxicity
Nutrient Uptake
Nyctinastic
O
Oomycetes (Water Moulds)
Open-Pollinated
Optimal DLI
Optimal PPFD
Optimal PPFD Range
Orcharding
Orchids
Organelles
Organic Fertilizer
Organic Fraction
Organic Gardening
Organic Matter
Osmosis
Osmotic Pressure
Osmotic Stress
Ovary
Overwatering
Overwintering
Oviposition
Oxygen Diffusion
Oxygen Restriction
P
Pallet Garden
PAR (Photosynthetically Active Radiation)
Parthenocarpic
Particle Size
Particle Size
Pedicel
Peduncle
Perched Water Table
Percolation Rate
Perennial
Perianth
Permaculture
Pest Threshold
Pests and Diseases
Petal
Petiole
pH
pH Buffer
pH Buffering
pH Range
Phenylalanine Ammonia Lyase (PAL) 
Phenylpropanoid Pathway
Phloem
Phosphorus (P)
Photoinhibition
Photoperiod
Photosynthate
Photosynthesis
Photosynthesis
Phototropins
Phototropism
Phytochromes
Phytohormone
Phytophthora
Phytophthora Root Rot
Pistil
Plant Group
Plant Succession
Plant Training
Plantlet
Plumule
Pollen
Pollination
Pollinator
Polyphenols
Porosity
Porosity Tier
Potassium (K)
Potting Mix
Powdery Mildew
PPF (Photosynthetic Photon Flux)
PPFD (Photosynthetic Photon Flux Density)
Primary Failure (Watering)
Primary Limiting Factor
Primary Watering Failure
Product Attribution
Propagation
Pruning
Pythium
Q
Quantum Board Lights
Quicklime
Quiescence
R
Rabbits
Radicle
Rainforest
Raised Bed
Raised Bed Liner
Reactive Oxygen Species (ROS)
Receptacle
Reservoir
Rewatering Target
Rhizome
Rhizosphere
Riparian
Rockwool
Rodents
Root Apical Meristem
Root Exudate
Root Hair
Root Hairs
Root Oxygen Priority
Root Oxygen Sensitivity
Root Respiration
Root Rot
Root Trainer
Root Zone
Root Zone Failure
Rootbound
RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase)
Runner
Runoff
Rust
S
Salt Buildup
Saturation Vapour Pressure
Scale Insects
Season Extension
Seaweed Extract
Secondary Nutrients
Seed Coat
Seedling
Self-Pollination
Self-Watering Pot
Self-Watering System
Senescence-Associated Genes (SAGs)
Sepal
Sheet Composting
Showy Flowers
Silicification
Siltation
Single Highest-Impact Improvement
Slow-Release Fertilizer
Slugs and Snails
Soil
Soil Aeration
Soil Amendments
Soil Compaction
Soil Drainage
Soil Erosion
Soil Fertility
Soil Mix
Soil Moisture Meter
Soil pH
Soil Salinity
Soil Structure
Soil Texture
Soilless
Soluble Salts
Solutes
Species
Spectrum-Specific Lights
Spider Mites
Square Foot Gardening
Squash Bugs
Squash Vine Borers
Stamen
Stigma
Stipule
Stolon
Stomata
Stomatal Conductance
Strigolactones
Style
Suberization
Subsoil
Substrate
Succession Planting
Suckering
Sunk Cost
Surfactant
T
T5 Fluorescent
T8 Fluorescent
Taproot
Temperature Range
Tendril
Tepal
Terminal Cormel
Terrestrial Roots
Thermotropism
Thigmonasty
Thigmotropism
Thinning
Thrips
Tillage
Tobacco Mosaic Virus
Tomato Yellow Leaf Curl Virus
Topdressing
Topsoil
Total Dissolved Solids (TDS)
Trade Name
Transgenic Plants
Transpiration
Transplanting
Trellis or Support
Tropical Plants
Turgor Pressure
Turning
U
Ultramafic
Underplanting
Understory
Upper Light Tolerance
Urban Agriculture
Urban Forestry
UV (Ultraviolet)
V
Vacuole
Vapour Pressure Deficit (VPD)
Variegation
Variegation Modifier
Variety
Velamen Radicum
Vermicomposting
Vernalisation
Vertical Farming
Verticillium Wilt
W
Water Holding Capacity
Water Uptake Pattern
Watering Schedule
Whiteflies
Wicking
Wireworms
X
Xeriscaping
Xylem
Y
Yield
Z
0-9 & Misc
µmol (Micromole)
μmol/m²/s