Light
Japanese blood grass shows its best coloration in full sun, at least six hours of direct sun per day. In Southern gardens, some afternoon shade is tolerated.
Soil
Provide your Japanese blood grass with moist, well-drained soil. The plants grow well in sandy soils, and can even thrive in coastal gardens.
Water
Japanese blood grass grows vigorously in the presence of moist soils, but it tolerates drought conditions as well. Only irrigate the plant as necessary to prevent the browning of foliage.
Temperature and Humidity
Japanese blood grass grows well in a wide range of temperatures. In the warmer reaches of its zone boundaries, the plants can spread and displace other garden plants with their rhizomes. Both humid and dry conditions are tolerated by the grasses.
Fertilizer
No fertilizer is needed to grow Japanese blood grass successfully, as the plants will grow in poor soil. Extra nutrients may cause the grass to grow aggressively.
Types of Japanese Blood Grass
Because of its invasive tendencies, gardeners should take care to purchase only the named, sterile cultivars, which include ‘Red Baron’ and ‘Rubra.’ These grasses don’t look different from the species, but have the important attribute of forming few or no flowers, and spreading slowly by rhizomes rather than quickly taking over the flowerbed.
Pruning
Japanese blood grass plants look attractive throughout the winter months and may be somewhat evergreen in most climates. Leave the plants standing until spring, and then cut them back, or just trim away dead foliage.
Propagating Japanese Blood Grass
Japanese blood grass is easy to propagate by division, even for beginners. Cut into the plant with a spade in the spring or fall, when growth is most active. Don’t be afraid to make many small divisions as needed, as the plants will grow and mature rapidly.
Growing Japanese Blood Grass From Seeds
The desirable named cultivars of Japanese blood grass do not produce viable seeds. It isn’t recommended to grow seeds of the invasive species type.
Potting and Repotting
Japanese blood grass isn’t picky about potting soil or container types. Grasp the plant by the root ball and loosely pack the potting medium around the plant. Repot in the spring or fall as needed when plants become crowded with spreading rhizomes.
Overwintering
No special care is needed for overwintering this plant. The colors stay vibrant through cooler temperatures, so many leave it alone and cut it back in early spring.
Common Problems with Japanese Blood Grass
Japanese blood grass isn’t bothered by any pest or disease problems. Plants that revert to green should be removed to avoid significant invasive habits.
