Japans bloedgras

Imperata cylindrica 'Red Baron'

Engels: Japanese Blood Grass

ornamental grassPoaceae

Japans bloedgras (Imperata cylindrica 'Red Baron') is a ornamental grass from the Poaceae family that grows up to 50cm tall. This plant thrives in full sun to partial shade and requires low maintenance.

Hoogte

30–50 cm

Breedte

30–50 cm

Zonligging

full sun, partial shade

Waterbehoefte

moderate

Grondsoort

loam, sandy soil

Onderhoud

low maintenance

Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
🌱Planten
✂️Snoeien
💧Bemesten

Care tips

Planting

Japanese blood grass thrives in full sun or partial shade, though the best red colouring develops in a sunny position with at least six hours of direct light daily. It adapts to most well-drained soils but performs particularly well in loam or sandy soil that doesn't stay waterlogged. Avoid heavy clay unless you improve drainage with grit or organic matter. Plant in April, May, or September when the soil is workable and temperatures are mild. Spring planting gives the grass a full growing season to establish, while autumn planting works well if the soil isn't too wet. Dig a hole slightly larger than the root ball and loosen the soil at the base to encourage root spread. Set the plant at the same depth it was growing in its pot—planting too deep can smother the crown. Space plants 35 cm apart for a continuous drift or groundcover effect. If you're planting a single specimen or small group, the same spacing applies between individual clumps. After planting, firm the soil gently around the roots to eliminate air pockets, then water thoroughly to settle the plant in. Apply a 5 cm layer of mulch around the base, keeping it a few centimetres clear of the crown to prevent rot. This conserves moisture and suppresses weeds while the grass establishes. Water regularly for the first six to eight weeks, especially in dry spells, until you see new growth emerging. Once established, Japanese blood grass is reasonably drought-tolerant but looks best with consistent moisture during the growing season.

Pruning

Japanese blood grass requires minimal pruning, but an annual tidy-up in March keeps it looking sharp and encourages fresh, vibrant growth. By late winter the previous season's foliage will have faded to straw-coloured or brown, and cutting it back makes way for the new red-tipped blades that emerge in spring. Use a pair of sharp garden shears or secateurs to cut the entire clump down to about 5–10 cm above ground level. Work through the clump systematically, gathering handfuls of old stems and slicing through them cleanly. The foliage is fairly soft compared to some ornamental grasses, so the job is straightforward. Rake up and compost the trimmings, or bin them if they show any signs of disease. Timing matters: prune too early in winter and you remove the structure and subtle winter interest the dried foliage provides; leave it too late into April and you risk damaging emerging new shoots. March offers the sweet spot when the worst frosts have passed but new growth is only just beginning. Japanese blood grass doesn't need deadheading because it rarely flowers in our climate—its appeal lies entirely in the foliage. If any flower spikes do appear, you can remove them, though they're uncommon. Throughout the growing season, simply pull away any dead or damaged leaves by hand to keep the clump tidy. This grass doesn't require shaping or thinning; the annual spring cut-back is all the pruning it needs to perform well year after year.

Maintenance

Japanese blood grass is low-maintenance once established, but a few seasonal tasks keep it healthy and colourful. Water regularly during the first growing season to help roots establish, then reduce frequency. In summer, water during prolonged dry spells—the grass tolerates short droughts but the foliage may lose intensity if too stressed. In autumn and winter, natural rainfall is usually sufficient. Feed once a year in April with a balanced general-purpose fertiliser or a slow-release granular feed scattered around the base of the clump. Avoid high-nitrogen feeds, which can encourage lush green growth at the expense of the characteristic red colouring. A light application is enough; over-feeding isn't necessary and can make the plant floppy. This grass is fully hardy in zones 5a–9a and needs no winter protection in temperate Europe. The foliage dies back naturally in autumn, providing some structure through winter before you cut it down in March. Mulch lightly around the crown in late autumn if your soil is very free-draining, but don't smother the plant. Japanese blood grass has few pest or disease problems. Occasionally rust can appear as orange pustules on the leaves, especially in humid conditions or if plants are overcrowded—improve air circulation and remove affected foliage. Slugs rarely bother established clumps. The main concern is the species form, *Imperata cylindrica*, which is invasive; always ensure you're growing the cultivar 'Red Baron', which is clump-forming and well-behaved. Divide congested clumps every three to four years in spring to maintain vigour.