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Annual phlox
Also known as: Tharp's phlox, Johnston's phlox
Annual phlox (Phlox drummondii) is a flowering plant native to the United States. Thomas Drummond the historical naturalist sent the seeds back to Britain after a trip to Texas, and the plant is named after him. Annual phlox is a popular ornamental plant due to its bright pink flowers, which can be other colors from other cultivars.
Scientific classification
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Spring, Summer, Fall
Bloom Time
Fall
Harvest Time
25 cm
Plant Height
15 cm to 45 cm
Spread
Green
Leaf Color
2.5 cm
Flower Size
Brown
Fruit Color
White, Pink, Red, Purple, Yellow, Cream, Blue, Lavender
Flower Color
Green, Blue, Orange, Cream
Stem Color
Winter dormancy
Dormancy
Deciduous
Leaf type
20 - 35 ℃
Ideal Temperature
Spring, Summer
Growth Season

Images of Annual phlox

Distribution of Annual phlox

Distribution Map
Annual phlox is native to the southeastern region of North America. This species has been introduced to various parts of South America, Southeast Asia, and Eastern Europe. It is widely cultivated beyond its native range, often found in ornamental gardens for its colorful flowers.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Roadsides, fields, waste places, grasslands, open woodlands
Hemisphere Trend Curve

Culture

Garden Use
Annual phlox is a popular perennial prized for its profusion of fragrant flowers and early blooming period. It is commonly used as a border or spring groundcover and is essential in bee, butterfly, and hummingbird gardens. Plant it with calibrachoa, verbena, and nasturtiums to attract pollinators throughout the spring and summer.
Symbolism
Our souls are united.
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Quickly Identify Annual phlox

1
1-inch flowers in vibrant hues from white to deep red, with distinct central eye.
2
Trumpet-shaped flowers with 5 star-shaped petals in terminal clusters, 1 inch in diameter.
3
Dry capsules that dehisce to release small seeds, matching foliage color for camouflage.
4
Sticky, lanceolate leaves up to 3 inches long with defined veins and clasping nature.
5
Compact and bushy plant reaching 6-12 inches in height and width, blooming in spring and sometimes fall.
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Care Guide for Annual phlox

Every week
Water
Full sun
Sunlight
20 - 35 ℃
Ideal Temperature
Garden Soil
Soil Type
Water: Annual phlox thrives in moist, well-drained soil and prefers consistent moisture without being waterlogged. Weekly watering is essential to maintain ideal hydration. As an annual plant grown outdoors, annual phlox benefits significantly from rainwater during its active growing season.
Fertilize: To promote optimal blooming in annual phlox, apply high phosphorus fertilizers monthly during the growing season, following package instructions to prevent root burn. Water thoroughly after application and adjust frequency based on blooming activity. Even fertilizer distribution enhances annual phlox's vibrancy and health.
Pruning: Annual phlox thrives with strategic pruning in early to late spring. Deadheading spent flowers fosters blooming and a bushier shape. Removing damaged stems enhances air circulation and overall health, leading to improved flowering, a tidy appearance, vigorous growth, and reduced disease risk.
Propagation: Annual phlox easily propagates by sowing in Spring and requires minimal care. After germination, indicated by seedling emergence, thin the plants for optimal growth. No special techniques are needed for successful cultivation.
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