
Genus Sisyrinchium
The genus sisyrinchium consists of many species of annual and perennial flowering plants, known as the blue eyed grasses. They are a prominent plant species that occurs all over North America, either as a wild plant or as a cultivated landscape plant.
These plant species are part of the iris family (Iridaceae) and are not actually true grass, but are monocots. A monocot is a grass or grass-like flowering plant, wherein each individual seed only contains one single embryonic leaf.
Blue-eyed grass is well known for being easy to care for, and for its lovely little periwinkle flowers that seem to stare at you with their little yellow eye. (This yellow eye simply being the corolla of the flower).
There are so many wonderful types of flowers out there, and we’ve gone over a great many of them to help educate the masses about the proper care and general information about different flower types. So whether you’re planning for your cottage garden or you’re trying to brighten up your balcony, you’re sure to find the perfect candidate in this wonderful flower article series.
Related: Famous Types of Flowers | Types of Flowers by Color | Types of Flowers by Alphabet
What are Some Common Types of Blue Eyed Grass?
Narrow Leaf Blue Eyed Grass (Sisyrinchium Angustifolium)

Narrow leaf blue eyed grass, or common blue eyed grass, is the most common and widespread of the genus sisyrinchium. It is extremely common all over the eastern United States, and can be found in low woodlands and along shorelines.
This plant will grow to be around 12 inches tall, and each individual plant stem will bloom with a small, blue or white flower with a yellow eye in the centre.
Strict Blue Eyed Grass (Sisyrinchium Montanum)

Strict blue eyed grass can also be referred to as American blue eyed grass or mountain blue eyed grass. This plant also grows all over North America, but at higher elevations.
This grass is known to bear an extremely striking violet blue flower, with fields spanning very large areas.
Western Blue Eyed Grass (Sisyrinchium Bellum)

Western blue eyed grass can also be referred to as California blue eyed grass. This plant is very common in California, Oregon, and the Sierra Nevada.
These plants prefer to grow in grasslands and woodlands, though they are able to grow up to elevations of 2400 meters above sea level.
These are a taller species of grass, sometimes achieving heights of 24 inches, with flower colors ranging from white, to blue, to violet.
Prairie Blue Eyed Grass (Sisyrinchium Campestre)

Prairie blue eyed grass can also be referred to as white eyed grass. This plant is native to the central United States, and is the most drought tolerant of the genus.
This plant is slightly different from the others as it will bear flowers that are either pale blue or white. Stems are also shorter, growing to an average of 10 inches in height.
What does Blue Eyed Grass Look Like?
Flowers
Depending on the species, blue eyed grasses will bear flowers that are very small with 6 petals. The differences lie in the color of the flowers, that can range from white, to pale blue, to deep blue, to striking violet.
Flowers also have a striking yellow eye in the centre of the flower, otherwise known as the corolla. These flowers are known for being star shaped, giving it the common nickname of “star grass”.
*A cute aspect of these flowers are that they close their eyes at night time, and open them back up again in the morning! The first pop their heads out in the early spring.

Leaves/Stems
Blue eyed grass has foliage that acts both as a leaf and as a stem. These leaves are very tall and narrow, like a blade of grass. A leaf will usually be 1/8 of an inch wide, and anywhere from 10-20 inches in height.
Each individual flattened leaf flowering stem each comes from an individual seed, and each leaf will bear a flower at the end of it. These are unbranched stems.
Growth Pattern
Blue eyed grasses grow in clumps of long and slender foliage. These clumps are comprised of wiry stems topped with beautiful blue flowers. Grass-like leaves can spread over a wide distance and create a large patch.

How does Blue Eyed Grass Reproduce?
Blue eyed grass is a herbaceous perennial plant, meaning that it will continue to bloom season after season. This is due to the fact that its root system consists of a bulb that will remain alive even during the winter months, and the plant will flower again the following spring.
Flowers usually bloom in early June, and will remain in bloom for several weeks after – usually from early spring to late spring. This leaves for a moderate window of opportunity. If pollinated, right before they fall away, they will release small and round seed capsules that are filled with small black seeds.
These capsules are eaten by various bird and small mammal species, which help with seed dispersal. Their digestive tracts also help break down the hard capsule, making for quicker germination.
Where does Blue Eyed Grass Grow?
Blue eyed grass is native to all of North America and some parts of South America. They can grow in USDA zones 4 through 9.
These plants can be found growing in the wild in prairies, parklands, open moist meadows, open forests, damp fields, and along shorelines.

What are the Growing Conditions of Blue Eyed Grass?
Soil
Blue eyed grass can tolerate any level of acidity in its soil, and the soil can be relatively low in nutrients. The many requirements for soil are that it is well-drained, and never becomes completely dry or completely waterlogged. Sandy soil is usually a good option for this plant!
Mulch
When planting blue eyed grass on your property as ornamental grass, know that a little mulch goes a long way! Mulch provides organic material in low-nutrient soil and helps protect the growing plant against freezing temperatures.
Sun Exposure
It is best to plant blue eyed grass is an area that receives partial shade. Though this plant can tolerate existing in full sun, it will not bloom as readily or experience as much height.

Water Level
The blue eyed grass plant tends to perform just fine with moderate levels of water, and needn’t be watered if it is a rainy season. Just ensure that the soil never completely dries out.
Temperature
Blue eyed grass grows all over North America in many different climates and temperatures. It can tolerate both very high heat and very low cold as well.
Fertilizer
These plants have adapted to exist in poor soil that is low in nutrients, and therefore they needn’t be given much fertilizer, if at all.

Pruning
If you’re looking to keep your blue eyed grass nice and healthy, it may be a good idea to prune it. Do this by leaving the leaves intact until the blooms fall away in the late summer. This allows for the plant to gather energy to store in its rhizomes underground for the following season’s bloom. Once the leaves die, cut them back to above the crown.
Though blue eyed grass doesn’t necessarily need to pruned, it is beneficial for the plant for its roots to be separated. Plants that over developed tend to experience root rot, and their root system becomes too dense.
To do this, cut away rhizomes from the main plant and plant them as individuals specimens away from the main plant. Each clump will become larger each year due to seed droppings.
Intolerances
Blue eyed grass is very resilient and doesn’t have many serious intolerances. They simply will not perform well if they experience full sun, drought, or flood – but this is quite regular for most plant species.
How is Blue Eyed Grass Used?
Incorporating blue eyed grass to your property is a wonderful and easy way to introduce a native and wild looking plant to your cottage garden or city planters.
They can be used in a rock garden, as border plants, they make for a great container plant, and they create the essence of a wildflower meadow.
Not only that, they are a very important source of nectar for pollinators like native bees, moths, and butterflies, and they help feed wild birds all year long as well. They turn any wild space into a woodland garden.

FAQs