Understanding shrub categories—evergreen vs. deciduous, flowering vs. non-flowering—simplifies identification and informs garden design. This guide covers definitions, key characteristics, and practical identification approaches.
What Is a Shrub?
- Definition: Woody plant; multiple stems from base; height <5-6 meters
- vs. Tree: Single trunk; >6 meters typically
- vs. Herbaceous: Woody persistent stems
- Examples: Rose, lavender, periwinkle, boxwood, hydrangea
Shrub Categories
By Leaf Retention
- Evergreen: Retain leaves year-round (shed some annually)
- Broadleaf: Rhododendron, camellia, holly, boxwood
- Needled: Juniper, yew, pine, spruce
- Deciduous: Drop all leaves in fall
- Flowering: Lilac, forsythia, hydrangea, viburnum
- Foliage: Barberry, burning bush, ninebark
- Semi-evergreen: Retain leaves in mild winters; drop in harsh (abelia, privet)
By Flowering
- Flowering shrubs: Ornamental blooms; attract pollinators
- Most deciduous
- Exceptions: Rhododendron, azalea, camellia (evergreen + flowering)
- Container suitable for many
- Non-flowering: Grown for foliage, form, fruit (boxwood, yew, juniper)
Evergreen Shrub Essentials
- All shed some leaves annually—not truly "never losing leaves"
- Site matching critical: Soil, light, wind, moisture
- Broadleaf evergreens: Need wind protection, consistent moisture, winter shade
- Spacing: Allow mature spread—crowding ruins form
- Soil aeration & nutrition: Essential for health
- Year-round value: Structure, screening, wildlife, winter color
Flowering Shrub Care
- Pruning: Annual; after flowering for spring bloomers
- Benefits: Vigorous growth; healthy flower buds; size control
- Butterfly gardens: Nectar + fragrance = pollinator magnets
- Container growing: Many adapt well (hydrangea, azalea, rose)
Bonsai: Shrubs as Living Art
- Origin: China (pun-sai); refined in Japan
- Concept: Miniaturized ornamental trees/shrubs in shallow containers
- Early style: Sparse foliage; gnarled trunks; animal forms (dragons, birds)
- Modern style: Natural tree forms; horticultural precision
- Suitable shrubs: Boxwood, juniper, azalea, pine, maple, wisteria
- Many flowering/evergreen shrubs adapt to bonsai
Indoor & Specialty Uses
- Houseplants: Ming aralia, schefflera, dwarf schefflera, gardenia, azalea
- Rock gardens: Dwarf conifers, creeping juniper, alpine shrubs
- Terrace/container: Dwarf varieties; seasonal rotation
- Herbal/medicinal: Many medicinal plants are shrubs (elderberry, witch hazel, barberry)
- Herbal gardening: Culinary and medicinal shrub collections
Identification Workflow
- Category: Evergreen vs. deciduous; flowering vs. not
- Leaf exam: Type (simple/compound/needle/scale); shape; margin; arrangement
- Stem/bark: Color; texture; thorns; buds
- Flowers/fruit: Type; color; timing; arrangement
- Habit: Size; shape; branching pattern
- Habitat: Sun/shade; wet/dry; region
- Reference: Dirr's Manual; USDA Plants; local extension; apps
Resources
- Michael Dirr, Manual of Woody Landscape Plants
- USDA PLANTS Database (plants.usda.gov)
- State extension publications
- iNaturalist, PlantNet, PictureThis
- Local arboretum/botanical garden
- Native plant societies
