Troubleshooting
sioux blue indian grass problems — and how to fix them
sioux blue indian grass (Sorghastrum nutans 'Sioux Blue') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Loss of blue foliage colour
Shade, excess nitrogen, and overly moist soils all cause the foliage to revert toward green, eliminating the ornamental blue-grey quality. Grow in full sun, lean soil, and avoid fertilising. The blue colour is most intense in midsummer and fades naturally toward autumn as leaves age.
Slow to establish in first season
Like the species, 'Sioux Blue' invests in root development during year one and above-ground growth may disappoint initially. Resist the urge to feed or over-water. Full ornamental impact is typically seen from year two onward.
Lodging in exposed or fertile sites
In very exposed or over-fertilised positions the tall culms can lean or lodge after heavy rain. Site in a sheltered-but-sunny spot and avoid rich amended soils. Cutting back in late winter prevents the accumulation of old, heavy stems.
Prevent sioux blue indian grass problems before they start
Most sioux blue indian grass issues are care-mismatch, not bad luck. Dial in the basics:
sioux blue indian grass problems — FAQ
Why is my sioux blue indian grass loss of blue foliage colour?
Shade, excess nitrogen, and overly moist soils all cause the foliage to revert toward green, eliminating the ornamental blue-grey quality. Grow in full sun, lean soil, and avoid fertilising. The blue colour is most intense in midsummer and fades naturally toward autumn as leaves age.
Why is my sioux blue indian grass slow to establish in first season?
Like the species, 'Sioux Blue' invests in root development during year one and above-ground growth may disappoint initially. Resist the urge to feed or over-water. Full ornamental impact is typically seen from year two onward.
Why is my sioux blue indian grass lodging in exposed or fertile sites?
In very exposed or over-fertilised positions the tall culms can lean or lodge after heavy rain. Site in a sheltered-but-sunny spot and avoid rich amended soils. Cutting back in late winter prevents the accumulation of old, heavy stems.