Hellebore leaf spot
Large brown-black blotches on hellebore leaves, often with a paler ring and a distinct dark margin, spreading down the leaf stalk and into the flower stems. On an old clump carrying last year's foliage it is close to universal, and the treatment is a pair of secateurs rather than anything sprayed.
Caused by: Microsphaeropsis hellebori · also called hellebore black spot
What brings it on
Wet winters and old foliage retained through the season. Spores wash from last year's leaves onto this year's emerging flower buds, which is the whole mechanism and the whole reason removal works.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Hellebore leaf spot
Checked 2026-08-13
Usually seen: November, December, January, February, March, April, May, October
Preventing it
Ordered by how much difference each measure actually makes, not by how often it is repeated.
- Cut all the old leaves off Helleborus x hybridus in late autumn or early winter, before the flower buds push up. This is standard practice for the appearance of the flowers and it is also the control.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Hellebore leaf spot — control
Checked 2026-08-13
- Do not do this to the shrubby hellebores such as H. foetidus and H. argutifolius, whose flowers are carried on last year's stems — removing the foliage removes the flowers. The advice is specific to the stemless hybrids, and repeating it as a blanket instruction is a common way to lose a season.
source
GrowingHQ editorial positionhigh confidence
A distinction between hellebore groups that general leaf-spot advice omits, and that changes what the reader should cut.
- GrowingHQ editorial synthesis — GrowingHQ
Checked 2026-08-13
Dealing with it once it is there
- Remove spotted leaves as they appear through the season and take them off the ground. The plant is not usually harmed; the disfigurement is the problem.
source
Horticultural consensusmoderate confidence
- Royal Horticultural Society: Hellebore leaf spot — control
Checked 2026-08-13
What it affects
On sprays and treatments
GrowingHQ does not tell anyone what to apply, at what rate, or how often. Pesticide approvals differ by country, change without notice, and the product label is legally binding — it is also the document you are holding. What is described here is cultural and physical control, which is what a home grower can act on without a label in front of them.