Troubleshooting
Blue Heaven Little Bluestem problems — and how to fix them
Blue Heaven Little Bluestem (Schizachyrium scoparium 'Blue Heaven') 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.
Flopping and open centre
Almost always caused by overly rich soil, excessive irrigation, or insufficient sun. Grow in full sun in lean, dry soil with no supplemental fertiliser.
Rust fungus
Orange pustules in humid summers. Avoid overhead watering; improve air circulation. In extreme cases remove affected foliage. Cut plants back hard in late winter to remove diseased material.
Crown rot in wet winters
Standing water at the crown in winter can kill plants, especially in clay soils. Ensure excellent drainage; mound planting in wet soils.
Gradual clump widening
Unlike some grasses, little bluestem does not spread aggressively, but clumps slowly enlarge. Divide every 4-6 years in early spring to rejuvenate.
Loss of blue colour in shade
The distinctive steel-blue foliage is a sun-response. Even partial shade shifts plants toward green. Ensure unrestricted full-sun exposure.
Prevent blue heaven little bluestem problems before they start
Most blue heaven little bluestem issues are care-mismatch, not bad luck. Dial in the basics:
Blue Heaven Little Bluestem problems — FAQ
Why is my blue heaven little bluestem flopping and open centre?
Almost always caused by overly rich soil, excessive irrigation, or insufficient sun. Grow in full sun in lean, dry soil with no supplemental fertiliser.
Why is my blue heaven little bluestem rust fungus?
Orange pustules in humid summers. Avoid overhead watering; improve air circulation. In extreme cases remove affected foliage. Cut plants back hard in late winter to remove diseased material.
Why is my blue heaven little bluestem crown rot in wet winters?
Standing water at the crown in winter can kill plants, especially in clay soils. Ensure excellent drainage; mound planting in wet soils.
Why is my blue heaven little bluestem gradual clump widening?
Unlike some grasses, little bluestem does not spread aggressively, but clumps slowly enlarge. Divide every 4-6 years in early spring to rejuvenate.
Why is my blue heaven little bluestem loss of blue colour in shade?
The distinctive steel-blue foliage is a sun-response. Even partial shade shifts plants toward green. Ensure unrestricted full-sun exposure.