Elymus glaucus — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Elymus glaucus

Elymus Glaucus

Updated · 9 observations
ON THIS PLANT

Elymus glaucus is a species of grass known as blue wild rye or blue wildrye. This grass is native to North America from Alaska to New York to northern Mexico. It is a common and widespread species of wild rye.

A note from PlantMom

Blue wild rye demonstrates strong resistance to disease and is usually not susceptible to illnesses. In terms of care, this plant is fairly low-maintenance. When grown outdoors it needs little watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they have finished blooming. Blue wild ryet is suitable for anyone with an outdoor area, such as a garden or deck, and does not demand a lot of gardening experience.

— PlantMom
CARE GUIDE

How to keep Elymus Glaucus.

Light

Blue wild rye grows best when it gets plenty of sunlight throughout the day. It can, however, adjust to situations that include some shaded periods. Its requirement for a substantial amount of light affects its healthy development. Both too much and too little light can impede its prosperity and vigor.

Water

Blue wild rye flourishes in moderate climates where it receives consistent moisture. To maintain its health, it needs to be watered once a week. This hardy perennial grass is an excellent choice for gardens, as it takes advantage of natural rainfall and supports the ecosystem during its active growing season.

Temperature

Blue wild rye is a native plant suited to temperate climates and grows well in temperatures from 41 to 95 °F (5 to 35 °C). It copes with seasonal temperature changes but may need shade during especially hot periods.

Fertilizer

Blue wild rye benefits from extra nutrients to encourage healthy new growth. In spring, adding compost around the base of the plant will effectively supply the required nourishment. Fertilizing supports vigorous growth and helps the plant resist diseases and pests.

Pruning

Blue wild rye features slender stems and bluish-green leaves, and it thrives in a variety of habitats. To maintain its health and appearance, prune it in early spring. This will remove damaged stems, encourage new growth, and manage its spread, resulting in a tidy display. Be sure to use sharp, clean tools to minimize the risk of disease and to promote denser foliage and more abundant flowering.

CHARACTERISTICS

Botanical profile.

Plant Type
Grass
Life Cycle
Perennial
Genus
Elymus
Family
Poaceae
Hardiness Zone
4-10
Mature Height
0.49 m to 1.52 m
Mature Spread
49 cm to 91 cm
Leaf Color
Green, Blue
Leaf Type
Semi-evergreen
Flower Color
Yellow, Green, Purple, Brown
Flower Size
2.54 cm
Bloom Time
Early summer, Mid summer
Planting Time
Spring, Summer, Autumn
Harvest Time
Late summer, Early fall
ALSO KNOWN AS

Other names.

en Blue wild rye en Common western wild rye en Blue wildrye en Smooth wildrye en Western wildrye
FREQUENTLY ASKED

Reader questions.

What should I do if I give my Blue wild rye plant too much water or too little water?

Proper watering is crucial for this beautiful ornamental grass to thrive. When planted in the ground, any watering issues can be resolved. However, when grown in a container, both overwatering and underwatering can quickly kill Blue wild rye. Incorrect watering can cause stunted growth, yellow leaves with brown tips from overwatering, or drooping leaves, weak seed head production, and browned leaves from underwatering. If you suspect watering problems, the first step is to determine if it's too much or too little water. If it's too much, stop watering immediately, allowing heavy soils time to dry out. Test the soil for moisture when new growth appears to decide if more water is needed. Conversely, if it's not receiving enough water, simply give the grasses a deep drink to see if they perk up. It's important to note that long, deep watering is better than frequent shallow waterings. This encourages deep root growth, making the grasses more resistant to drought and less prone to watering-related problems.

What kind of sunlight does Blue wild rye require?

Blue wild rye requires full sun every day, with a minimum of six hours of sunlight to maintain healthy leaves, roots, and blooms. While many perennials also need six hours of sun daily, plants like the Orange Daylily or Giant Coreopsis can survive on just three hours of sunlight. However, it's important to note that these plants won't thrive as well as they would in sunnier conditions.

What is the best temperature for Blue wild rye?

Blue wild rye's ideal temperature depends on the time of year. There are two main seasons to consider: the growing season and the dormancy season. During the growing season, when Blue wild rye begins to sprout, the best temperature range is 65~80℉(18~27℃). If it gets colder than 15℉(-10℃), the plant may suffer, with browning and wilting leaves. However, a short cold snap can be survived with some assistance. In the warmer months, Blue wild rye should also be protected from excessive heat. Temperatures above 95-105℉ (35-40℃) can harm the foliage and blooms, causing wilting, drooping, and even sunburn. Recovering from this damage can be challenging for Blue wild rye. Luckily, there are simple and efficient ways to address this issue.

How many times should I water my Blue wild rye plant?

The watering needs of Blue wild rye depend on its location. Generally, watering it once a week is recommended. In hot climates, watering once or twice a week in the summer may be necessary. In moderate climates, watering once every seven days or more may be sufficient. Grass in containers usually needs more frequent watering compared to grass planted in the ground. However, the location also plays a role, as shaded grasses need less frequent watering than those in the ground. Only water Blue wild rye when the soil is dry. To determine if the soil is dry, press your finger a couple of inches into it. For potted grass, you can weigh the grass or feel the pot to check if it's light from lack of water. Insufficient water can cause the blades to appear folded and thinner. Despite its drought tolerance, regular, deep waterings will result in a beautiful color. In the wild, Blue wild rye thrives in open scrubland with extreme heat, bright sun, and intermittent rain. Although it is drought resistant, it still requires care and attention. It is best to provide consistent water for optimal growth. Newly planted Blue wild rye needs more frequent watering until its roots are established. If planted in pots, the soil dries quickly, especially in hot, direct sun. Check the soil every 3 to 4 days and water only when it feels dry. Blue wild rye planted in the ground generally needs less watering, but this depends on the soil type. Clay soil holds water for a long time, so it may feel dry on the surface while retaining moisture below. Sandy soils drain quickly and require more frequent watering.

Can the sun harm Blue wild rye? How can we shield Blue wild rye from the sun and heat?

In warm climates, some Perennial Flowering Plants may struggle with excessive heat and suffer from sun damage. They can wilt, dry out, or even experience growth problems if they are consistently exposed to the intense afternoon sun. However, not all plants require protection from the light afternoon sun. For those that are harmed by intense afternoon exposure, it is recommended to provide them with some shade in warmer climates. Gardeners can achieve this by planting these plants in areas that do not receive direct heat during the afternoon, such as under trees or behind bushes.

What temperature does Blue wild rye need in its first year or when it is a seedling?

If you're growing Blue wild rye for the first time, it's important to take extra care during the coldest months. Frost can severely damage a young Blue wild rye and prevent it from growing back healthy in spring. To protect it, keep the temperature above 40℉(5℃) by either bringing it inside or using mulch or fabric barriers. During the first year or two, it's best to plant the Blue wild rye in a shadier spot as smaller plants struggle to maintain their temperature in the heat. Limit direct sunlight to no more than five hours a day, especially if it gets hotter than 80℉(27℃). Use shadecloth and water or mist frequently to control the summer heat.

What do I need to be cautious about when watering my Blue wild rye during different seasons, climates, or during different stages of growth?

To determine if you are watering your grass adequately, observe the rate at which it grows. Blue wild rye, for instance, tends to double in size during the hottest months of the year. If the weather is hot but the grass is not growing vigorously, consider adjusting 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 due to growth, whereas water needs will decrease significantly during winter and cooler months. Remember that it is crucial to allow the soil for Blue wild rye to completely dry out before adding water.

Do I need to keep Blue wild rye out of the sun?

Certain perennial plants require ample sunlight to reach their maximum bloom. However, in warmer climates, some of these plants actually benefit from less sun. For instance, individuals residing in hotter regions might find it beneficial to shade their flowering perennials during the intense afternoon sun, especially during summer months. Although many perennial flowering plants prefer partial shade in the hottest climates, there are exceptions. Take the Giant Coreopsis, for example, as it is not bothered by excessive sun exposure. These plants can flourish even when placed in the full sun during scorching weather.

How do I keep Blue wild rye safe from very hot or very cold weather?

Here are some steps to protect Blue wild rye from cold and hot temperatures. - If the temperature drops below 15℉(-10℃) during the growing season, there are a few measures you can take. If you're growing Blue wild rye in a container, bring it inside in bright, indirect light until the temperature rises above 15℉(-10℃) again. - For ground-planted Blue wild rye, you can use mulch or horticultural fabric to create a barrier that insulates the plant and protects it from frost and cold wind. - To protect Blue wild rye from temperatures hotter than 80℉(27℃) in the shade, limit its exposure to sunlight to six hours or less per day, preferably in the morning. You can put up shade cloth or a fine plastic mesh to reduce direct sunlight during the hottest parts of the day. - Installing a misting system that releases cooling mist around the base of the plant during the day can also help lower ground temperatures.

What will happen if Blue wild rye doesn't get enough sunlight?

If you're growing Blue wild rye and it's not getting enough sunlight, your plants will show signs of inadequate requirements. They won't produce as many blooms as they would in full sun. Some plants may develop dry spots on their leaves, but they will still bloom in inadequate sun. However, the flowers will be smaller and less full.

Suggestions for optimal temperatures during the dormant season for Blue wild rye.

Blue wild rye goes into dormancy during winter and needs a certain amount of cold in order to stay dormant until it's time to sprout. If it starts sprouting too early, before the last frost has passed, it can be fatal, especially if it's already started growing when the frost hits. Ideally, winter temperatures should be below 32℉ (0℃), but if they reach 40℉ (5℃), it's okay. However, in more temperate climates like woodland rainforests, an unexpected warm spell can trigger premature sprouting. If there's still a risk of frost, you can cover the sprout with clear plastic on stakes to protect it. This covering can be removed once the risk of frost has passed. Sometimes, Blue wild rye will sprout at the right time without any help, but using this method increases the chances of successful sprouting.

Do Blue wild rye need extra attention to sunlight at different times as it grows?

Blue wild rye is a wonderful flower for gardens. It thrives when it receives at least six hours of sunlight each day. However, during the hottest parts of the day, it is beneficial to partially shade the flowers to help them stay fresh longer. When Blue wild rye is young, it is important to ensure that they receive ample sunlight but are protected from intense afternoon heat. A fully mature plant should be given plenty of sun to promote proper growth.

PLATES
Elymus glaucus leaf
PLATE 01 · leaf
Elymus glaucus leaf
PLATE 02 · leaf
Elymus glaucus flower
PLATE 03 · flower
Elymus glaucus fruit
PLATE 04 · fruit
Elymus glaucus fruit
PLATE 05 · fruit
Elymus glaucus bark
PLATE 06 · bark
ALSO IN THE LIBRARY

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