Purple garden flowers: identification guide with photos
Purple is one of the most common colors in the garden flower spectrum, and many purple-flowered plants are superficially similar enough to cause confusion. This guide organizes common purple flowers by type (annual, perennial, bulb, shrub) and provides distinguishing features for the most commonly.
—- title: "Purple garden flowers: identification guide with photos" slug: purple-flowers-identification hub: plants category: "Plant identification" description: "How to identify common purple garden flowers by bloom time, flower form, and leaf shape — covering annuals, perennials, and bulbs with distinguishing features." date: 2026-06-10 updated: 2026-06-10 author: "Thomas A." reading_time: 10 release_after: 2026-09-29 —-
Purple is one of the most common colors in the garden flower spectrum, and many purple-flowered plants are superficially similar enough to cause confusion. This guide organizes common purple flowers by type (annual, perennial, bulb, shrub) and provides distinguishing features for the most commonly confused groups.
Per Missouri Botanical Garden, "purple" in horticulture covers a wide range from red-purple (magenta) through violet to blue-purple. True purple flowers — balanced between red and blue — include lavender, allium, and some clematis cultivars. Many "purple" flowers are technically violet or red-violet.
Purple spring bulbs
Allium (Allium spp.)
Globe-shaped flower heads composed of dozens of small star-shaped flowers on leafless stems 12–48 inches tall. The dried seed heads are also ornamental. Strong onion scent when foliage is crushed.
Common ornamental alliums: 'Gladiator' (4 inches diameter; violet-purple; 36 inches tall), 'Globemaster' (8 inches diameter; zones 6–10), 'Purple Sensation' (4 inches; rich purple; 24 inches), A. schoenoprasum (chive; smaller; 12–18 inches).
Per Penn State Extension, ornamental alliums bloom May–June in zones 5–7 and are among the most deer-resistant spring bulbs available.
Dutch crocus (Crocus vernus)
Cup-shaped flowers 2–4 inches tall in late February–March (zone 6). Purple varieties are among the earliest garden flowers. Distinguished from grape hyacinth (later, smaller, more tubular) by their larger cup-shaped flowers and grass-like foliage.
Hyacinth (Hyacinthus orientalis)
Dense spikes of small tubular flowers in April; intensely fragrant. Purple varieties include 'Amethyst' and 'Woodstock'. Distinguished from other spring bulbs by fragrance and the extremely dense, upright flower spike.
Purple spring perennials
Siberian iris (Iris sibirica)
Delicate-looking flowers with three upright standards and three falls (recurved petals). Grass-like foliage. Distinguished from bearded iris by the narrow, strap-like leaves (not broad sword-shaped) and the absence of the fuzzy "beard" on the falls.
Per NC State Extension, Siberian iris blooms late May–early June in zones 3–9, 2–3 weeks after bearded iris.
Salvia (Salvia nemorosa and related)
Upright spikes of small two-lipped flowers on square stems. Foliage aromatic when crushed (sage-like). Distinguished from veronica and agastache by the flower's two-lipped form with protruding lower lip.
Key purple salvias: 'May Night' (deep violet-blue; 18 inches; May–June), 'Caradonna' (deep purple with dark stems; 24 inches), 'East Friesland' (violet-purple; 18 inches).
Catmint (Nepeta × faassenii 'Walker's Low')
Loose, cascading spikes of small violet-blue flowers. Foliage strongly aromatic (cat-attractive). Distinguished from salvia by the smaller, more scattered flower arrangement and the more lax, mounding plant habit.
Purple summer perennials
Lavender (Lavandula angustifolia)
Dense spikes of small flowers on gray-green aromatic foliage. The most distinctive identification feature is the intense aromatic scent of the foliage and flowers. Zones 5–8 for most cultivars.
Per Clemson HGIC, 'Munstead' (compact; 18 inches; reliably hardy in zones 5–8) and 'Hidcote' (darker purple; 12–15 inches) are the most cold-hardy English lavender cultivars.
Purple coneflower (Echinacea purpurea)
Daisy-like flowers with swept-back purple-pink petals and a prominent orange-brown central cone. Native to the eastern US. Distinguished from other daisies by the prominent spiny central cone and the purple-pink (rather than true purple) ray flowers.
Per Cornell Cooperative Extension, coneflower is one of the most important native plants for goldfinches, which eat the seed heads in fall, and for native bees, which collect pollen from the central disc.
Russian sage (Salvia yangii)
Wispy spikes of small lavender-blue flowers on silver-white stems, creating a misty cloud effect. Distinguished by: white-silver stems (not green); very divided, aromatic leaves; very airy, loose flower arrangement compared to salvia or veronica.
Agastache (Agastache spp.)
Upright spikes similar to salvia but with anise-scented foliage (distinguishing feature). 'Blue Fortune' produces blue-purple spikes; 'Black Adder' produces very dark purple spikes.
Veronica (Veronica spicata)
Dense, tapering spikes of small flowers in purple-blue. Distinguished from salvia by: smaller individual flowers with no visible lip; denser, more cylindrical spike arrangement; non-aromatic foliage.
Purple annuals
Petunia (Petunia × hybrida)
Trumpet-shaped flowers in a very wide color range. Purple petunias range from pale lavender to near-black. Distinguished by the funnel shape and the very sticky foliage (mucilaginous glands).
Verbena (Verbena spp.)
Small clusters of five-petaled flowers; some trailing, some upright. Distinguished from petunia by the flat-topped cluster (not individual trumpet flowers) and the much smaller individual flower size.
Larkspur (Consolida ajacis)
Upright spikes of spurredflowers; delphinium-like. Distinguished from delphinium by annual habit and smaller stature (18–24 inches vs. 4–6 feet for delphiniums).
Sweet alyssum (Lobularia maritima)
Very small four-petaled flowers in dense clusters; purple varieties available but white is most common. Distinguished by tiny flower size and honey fragrance.
Purple shrubs and vines
Lavender (Lavandula spp.) as shrub
At full size (3–4 feet in zone 7–8 for L. intermedia types), lavender functions as a landscape shrub with long-lasting dried flower heads.
Butterfly bush (Buddleia davidii)
Dense elongated panicles of small purple flowers with orange eye. Distinguished by the large scale (6–8 feet), long (6–12 inch) flower panicles, and the strong attraction to butterflies. Note: listed as invasive in some western US states; sterile hybrid cultivars ('Pugster Blue', 'Buzz' series) are available.
Clematis (purple types)
Climbing vine with star-shaped or bell-shaped flowers depending on variety. Distinguished from other climbers by the compound leaves with twining petioles used for attachment. See the types-of-clematis guide for pruning group details.
Frequently asked questions
How do I distinguish lavender from agastache? Both have upright spikes of purple-blue flowers and aromatic foliage. Lavender foliage smells of lavender (camphor-like); agastache foliage smells of anise or licorice. Lavender stems are woody at the base; agastache stems are herbaceous. Per Penn State Extension, crushing a leaf and smelling it is the quickest identification.
Is there a reliable way to tell ornamental allium from wild onion? Per Missouri Botanical Garden, ornamental alliums (A. aflatunense, A. giganteum) have hollow round stems and die back foliage before bloom. Wild onion (A. vineale) is a lawn and garden weed with smaller flower heads and foliage that persists with the flowers. Both smell like onion when cut.
What purple perennial blooms earliest in spring? Per NC State Extension, lungwort (Pulmonaria spp.) produces purple-to-blue flowers in March–April, making it one of the earliest purple perennials. Siberian squill (Scilla siberica) is a purple-blue spring bulb that blooms before most other flowering plants.
What is the deepest, most saturated purple garden flower? Per Cornell Cooperative Extension, 'Royal Velvet' allium, 'Purple Sensation' allium, 'Black Knight' delphinium, and 'Jackmanii' clematis are among the most saturated purples available. For annual purple, 'Black Petunia' (Petunia 'Black Velvet') and 'Black Cat' snapdragon provide near-black purple-red tones.
Sources
- Missouri Botanical Garden — Purple Flowering Plants
- NC State Extension — Perennial Identification
- Penn State Extension — Garden Flower Identification
- Clemson HGIC — Lavender
- Cornell Cooperative Extension — Native Perennials