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Annual bluegrass
Also known as: Wintergrass, Low spear grass
Annual bluegrass (Poa annua) is a low-growing grass native to Europe and Asia. Poa annua is known commonly as both annual bluegrass and poa. The Latin name is derived from the Greek word poa, which is a type of fodder grass.
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Annual, Biennial
Lifespan
Grass
Plant Type
Spring, Early summer, Mid summer, Late winter
Bloom Time
Spring, Early summer, Late summer, Early fall, Mid fall
Harvest Time
15 cm to 25 cm
Plant Height
20 cm
Spread
Green
Leaf Color
2.5 cm
Flower Size
White, Green, Yellow
Flower Color
Green
Stem Color
Winter dormancy
Dormancy
Deciduous
Leaf type
20 - 35 ℃
Ideal Temperature
Spring
Growth Season
Rapid
Growth Rate

Images of Annual bluegrass

Distribution of Annual bluegrass

Distribution Map
Annual bluegrass is native to Eurasia and northern and eastern Africa, where it grows in disturbed, moist areas. With a now nearly worldwide distribution, it is widely considered invasive or weedy throughout much of the world, even in Antarctica.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Waste places, cultivated land, grassland
Hemisphere Trend Curve

Culture

Garden Use
Annual bluegrass is a popular turf in cool and warm climates since it spreads readily. It's often used in lawns or causeways, where its vibrant green clumps are pleasant to the eye. This grass sprouts tall whispy seed stalks in the summer months, which can be raked away. It grows in full sun but will turn brown in hotter weather during the summer.
Symbolism
Psychic powers, Protection. It symbolizes food, concealment and hardiness.
Interesting Facts
Annual bluegrass is a weed found in many lawns and turfs in North America. It spreads easily, and mowing does not prevent it from forming seeds. Each clump of grass can form 100 seeds over the course of eight weeks. The best form of control is to remove the entire plant from the lawn because herbicides will also kill the surrounding grass.
Name Story
Annual bluegrass: Annua refers to the meaning of annual. The bluegrass in the common name refers to the bluish appearance of the massed grass in late Spring. Although Poa annua is commonly considered as a solely annual plant for its name, perennial biotypes do exist.
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Weed Control

Annual bluegrass is native to temperate Eurasia but has been introduced to much of the rest of the world. It is considered a nuisance within its native range and invasive outside of it. This large range is partially due to high phenotypic plasticity, which allows annual bluegrass to adapt more readily to a variety of habitats. Additionally, each plant can produce thousands of seeds annually that can be spread by livestock, birds, wind, water, and clothes/boots. While a variety of herbicides have been shown to be effective in controlling annual bluegrass, some populations have evolved resistances. Thus, a rotation of different herbicides can be more effective. Alternatively, hand pulling can be effective at controlling small infestations, while mulching can also help suppress weed development.
How to Control It
The best time to manage annual bluegrass is before it sets seed in late spring or early summer. It's crucial to take action during or before this growth stage to prevent the plant from spreading.
  1. Hand pulling: Regularly inspect the garden for annual bluegrass and gently pull it out by hand, making sure to remove the entire root system to prevent regrowth.
  2. Mulching: Apply a thick layer of organic mulch around desired plants to suppress annual bluegrass by blocking sunlight and hindering its ability to germinate.
  3. Mowing: If annual bluegrass is in a lawn, keep the grass at a healthy height to outcompete annual bluegrass. Do not mow too short, as this can weaken the desired grasses and give annual bluegrass an advantage.
  4. Boiling water: Pour boiling water over annual bluegrass to kill the plant without the use of chemicals. Please exercise caution to avoid damage to surrounding plants.
  5. Vinegar spray: Mix a solution of vinegar, water, and a drop of dish soap to spray directly onto annual bluegrass, which will help to kill it – this is best used in areas where you don’t want any plants to grow, as it can harm other vegetation.
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Quickly Identify Annual bluegrass

1
Prow-shaped leaf tip distinguishes annual bluegrass from other grass species.
2
Whitish inflorescence atop slender stalks enhances annual bluegrass's recognition.
3
Stalked, awnless spikelets with pale green flowers characterize annual bluegrass's blooms.
4
Distinctive 'tramlines' and 'boat-shaped tips' mark annual bluegrass's smooth, green leaves.
5
Transverse wrinkles and smooth texture highlight annual bluegrass's keeled leaves.
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RELATED: How to identify Annual bluegrass

Care Guide for Annual bluegrass

Twice per week
Water
Full sun
Sunlight
20 - 35 ℃
Ideal Temperature
Garden Soil
Soil Type
Water: Annual bluegrass originates from temperate climates, thriving in consistently moist environments. It requires watering twice weekly and good soil drainage to prevent waterlogging. Adaptable to different sunlight levels, annual bluegrass is best grown outdoors during its active growing season.
Pruning: Annual bluegrass is a cool-season grass with dense growth. Prune in early to mid-spring, trimming to 1-2 inches to prevent invasive seed heads. Regular mowing once a week supports healthy growth, maintaining aesthetics and reducing disease risk.
Propagation: In spring, annual bluegrass is propagated mainly by sowing. This process is straightforward, with germination and healthy seedling growth indicating success. Ensuring regular watering and proper spacing contributes to optimal results in propagation.
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