Aira praecox — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Aira praecox

Aira Praecox

Updated · 89 observations
ON THIS PLANT

Aira praecox is a species of grass known by several common names, including early hair-grass, yellow hairgrass and spike hairgrass. It is native to Europe, where it is found in dry, sandy places, on rocky outcrops, and in heath grassland. It also grows in North America as an introduced species, where it can be found on the east and west coasts in sandy or rocky areas, such as beaches and roadsides. This is a tuft-forming annual grass growing up to about 25 centimeters in maximum height. The thin, narrow leaves are located at the base of the stem, and are typically 0.3–2 millimeters wide. It bears very small inflorescences of purple-tinted green bisexual spikelets. It is an annual, forming low and small but numerous tufts. It flowers from April to June.Certain moths and butterflies, including the Grayling butterfly and the Coast Dart moth, feed on it as larvae.

A note from PlantMom

Early hair grass is resistant to disease and generally not susceptible to illnesses. Regarding care, this plant is fairly low-maintenance. Planted outdoors it needs little watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they bloom. Early hair grass is suitable for anyone with an outdoor area, such as a garden or deck, and does not demand much gardening experience.

— PlantMom
CARE GUIDE

How to keep Aira Praecox.

Light

Early hair grass grows best in conditions that provide plenty of sunlight throughout the day. Its native habitat received a considerable amount of sunlight each day. Too little light can hinder its growth, while light beyond what it needs can damage the plant and cause harm.

Water

Early hair grass thrives in temperate climates with moderate rainfall. It needs balanced watering, ideally once a week, and is deciduous, shedding its leaves in winter to significantly reduce its water requirements.

Temperature

Early hair grass comes from habitats where temperatures generally sit between 68 and 95 °F (20 to 35 ℃). The plant does well in these mild conditions, and care should be adjusted with the seasons to keep it within that temperature range.

Pruning

Prune early hair grass in early spring to remove dead stems. This promotes new growth, prevents overcrowding, and enhances air circulation. By reducing the risk of disease, careful pruning encourages robust flowering and maintains the plant's natural form. This ensures vigorous regrowth and overall vitality, contributing to optimal garden performance.

CHARACTERISTICS

Botanical profile.

Plant Type
Grass
Life Cycle
Annual, Perennial
Genus
Aira
Family
Poaceae
Hardiness Zone
5
Mature Height
25 cm
Mature Spread
5 cm to 15 cm
Leaf Color
Green
Leaf Type
Deciduous
Flower Color
Yellow, Green, Blue, Brown
Flower Size
0.25 cm to 0.76 cm
Bloom Time
Early spring, Mid spring
Planting Time
Spring, Autumn
Harvest Time
Mid spring, Late spring
Native Area
Turkey, Sweden, Czech Republic, Poland, Croatia, Lithuania, Norway, Germany, Portugal, Italy, Spain, Switzerland, Denmark, Finland, France, Ireland, United Kingdom, Latvia, Belgium, Netherlands
ALSO KNOWN AS

Other names.

en Early hair grass en Yellow hairgrass en Early Hairgrass en Early Silver Hairgrass en Little Hairgrass en Small Hair-Grass en Small Hairgrass en Spike Hairgrass
FREQUENTLY ASKED

Reader questions.

What should I do if I give too much or too little water to my Early hair grass?

To ensure optimal performance of this beautiful ornamental grass, proper watering is crucial. When planted in the ground, any watering issues can be easily resolved. However, when grown in a container, excessive or insufficient watering can quickly lead to the death of Early hair grass. Insufficient water can cause the grass to stop growing, while excessive water can result in yellow leaves with brown tips. Underwatering can cause drooping leaves, weak seed head production, and browned leaves. If you suspect improper watering, the first step is to determine if there is too much or too little water. If the grass is receiving too much water, immediately stop watering and patiently wait for heavy soils to dry out. Once new growth appears, test the soil moisture and then decide if additional watering is necessary. On the other hand, if the grass is not receiving enough water, simply give it a deep drink and observe if it recovers. In general, it is better to water deeply to encourage the growth of deep roots, making the grass more resistant to drought and less susceptible to watering problems.

What are the sunlight requirements for Early Hair Grass?

Early Hair Grass requires full sun, which means it should receive above 6 hours of sunlight daily. It's essential to watch how sunlight moves through your garden to find spots that provide a balance of light and shade, ensuring the plants' happiness. This plant thrives under conditions that offer ample exposure to sunlight throughout the day, as its origin habitat experienced a significant amount of daily sunlight. Insufficient light can impair their growth, while too much exposure may damage the plant.

What is the ideal temperature range for Early hair grass?

Early hair grass thrives in environments where temperatures typically range from 68 to 95 °F (20 to 35 °C). These temperate conditions are essential for the plant's wellbeing. Care adjustments may be necessary as seasons change to maintain this temperature range, ensuring the plant's comfort.

How often should I water my Early hair grass plant?

The watering needs of Early hair grass depend on its location. Generally, it should be watered once a week. In hot climates, watering may need to be done once or twice a week. In moderate climates, watering once every seven days or more should suffice. Grass in containers needs more frequent watering than grass in the ground. However, the location also matters as shaded grasses require less frequent watering than in-ground grasses. Only water Early hair grass when the soil is dry. You can check the soil moisture by pressing your finger a couple of inches into the soil or by weighing the pot to see if it feels light. When the roots lack water, the grass blades may appear folded and thinner. Despite its drought tolerance, regular, deep waterings will enhance the color of the grass. Although Early hair grass is drought resistant, it still requires care and attention. It is best to water it consistently even in harsh, dry conditions. When newly planted, it needs more frequent watering until it establishes deep roots. For potted Early hair grass, the soil tends to dry out quickly, especially if it is exposed to hot, direct sun. Test the soil every 3 to 4 days and water when it feels dry. Early hair grass in the ground generally requires less watering, but this depends on the soil type. Clay soil holds water for longer periods, so it may feel dry at the surface while having sufficient moisture below. Sandy soils, on the other hand, drain quickly and need to be watered more often.

How can I provide adequate light for indoor Early Hair Grass plants?

Indoor Early Hair Grass plants require adequate lighting for optimal growth, especially when natural sunlight is insufficient, like in winter or in less sunny spaces. Artificial lights offer a vital solution, promoting faster, healthier growth. LED lights are a popular choice because they can be customized to provide the specific wavelengths of light that plants need. Full sun plants need 30-50W/sq ft of artificial light, partial sun plants need 20-30W/sq ft, and full shade plants need 10-20W/sq ft. The light source should be placed 12-36 inches above the plant to simulate natural sunlight, and the duration should mimic natural daylight hours, with most plants needing 8-12 hours of light per day.

Does Early hair grass require frost protection measures during winter?

No, Early hair grass is highly cold-tolerant and does not require additional frost protection measures during the winter. However, before the first freeze in autumn, it's recommended to water the plant generously. This ensures the soil remains moist and enters a frozen state, which helps prevent drought and water scarcity for the plant during winter and early spring.

What do I need to watch out for when watering my Early hair grass in different seasons, climates, or during different stages of growth?

Checking the rate of growth of your grasses can often indicate if you are watering enough. Early hair grass tends to double in size within a year during the hottest months. If the weather is hot but the grass is not growing vigorously, you may need to adjust your watering schedule. In winter, you may only need to water once a month, but it's still important to check the soil for moisture. During the warmest months, the grass will require more water during its growth cycle. However, in winter and cooler months, the need for water will significantly decrease. It's crucial to remember that the soil for Early hair grass should always be allowed to completely dry out before adding water.

What are the symptoms of inadequate light for Early Hair Grass?

When Early Hair Grass is cultivated indoors with inadequate light, it may exhibit symptoms such as smaller new leaves compared to previous ones, leggy or sparse growth, faster leaf drop, slower or no new growth, lighter-colored new leaves, and various others. Conditions like chlorosis, sunscald, leaf curling, wilting, and leaf scorching can also occur due to improper light levels. These symptoms indicate the plant's struggle with light deficiency or excessive sunlight.

What should I do if the temperature falls below -25°C for my Early hair grass?

Early hair grass is extremely cold-tolerant, but it's crucial to keep the winter temperature above -25°C. If temperatures drop below this threshold, while there may not be any noticeable changes during winter, the plant may experience a decrease in sprouting or even fail to sprout during springtime. In spring, it is recommended to remove any parts of the plant that have failed to sprout.

What solutions are available for Early Hair Grass suffering from inadequate sunlight?

To combat inadequate sunlight for Early Hair Grass, gradually move plants to a location where they receive at least 6 hours of direct sunlight daily. For indoor plants, consider using a south-facing window or artificial light to ensure optimal growth. Outdoor plants should be moved to sunnier spots gradually to avoid sunburn. Removing obstructions and transplanting smaller plants to sunnier locations are also effective strategies. While parts of the plant affected by insufficient sunlight may not recover, new growth will be healthy after increasing light exposure.

How does Early hair grass respond to high temperatures and how can I protect it?

Early hair grass is not tolerant to high temperatures. When the temperature exceeds 35°C (95°F), its growth will halt, and the plant becomes more susceptible to rot. To protect the plant in such conditions, trim away the sunburned and dried-up parts. Relocate the plant to a spot that provides shade during the midday and afternoon sun, or use a shade cloth. Additionally, watering the plant in the morning and evening helps to keep the soil moist and supports the plant's health under high temperatures.

PLATES
Aira praecox leaf
PLATE 01 · leaf
Aira praecox leaf
PLATE 02 · leaf
Aira praecox flower
PLATE 03 · flower
Aira praecox flower
PLATE 04 · flower
Aira praecox fruit
PLATE 05 · fruit
Aira praecox fruit
PLATE 06 · fruit
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