Troubleshooting
Tutsan problems — and how to fix them
Tutsan (Hypericum androsaemum) 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.
Rust (Melampsora hypericorum)
Orange-brown pustules appear on leaf undersides in summer, especially in humid conditions. Remove and destroy affected material promptly; improve air circulation by thinning congested stems; avoid wetting foliage when watering.
Hypericum beetle (Chrysolina quadrigemina)
A defoliating beetle introduced as biocontrol for invasive Hypericum in some regions. In garden settings it can strip foliage rapidly. Pick beetles off by hand or use a physical barrier; check plants regularly from midsummer.
Invasive seedling spread
Prolific berry production can result in large numbers of self-sown seedlings. Deadhead or collect berries before they drop if spread is undesirable; the plant is naturalised and potentially weedy in mild, moist climates.
Prevent tutsan problems before they start
Most tutsan issues are care-mismatch, not bad luck. Dial in the basics:
Tutsan problems — FAQ
Why is my tutsan rust (melampsora hypericorum)?
Orange-brown pustules appear on leaf undersides in summer, especially in humid conditions. Remove and destroy affected material promptly; improve air circulation by thinning congested stems; avoid wetting foliage when watering.
Why is my tutsan hypericum beetle (chrysolina quadrigemina)?
A defoliating beetle introduced as biocontrol for invasive Hypericum in some regions. In garden settings it can strip foliage rapidly. Pick beetles off by hand or use a physical barrier; check plants regularly from midsummer.
Why is my tutsan invasive seedling spread?
Prolific berry production can result in large numbers of self-sown seedlings. Deadhead or collect berries before they drop if spread is undesirable; the plant is naturalised and potentially weedy in mild, moist climates.