Seasonal dieback
A herbaceous perennial collapsing to nothing in autumn, or a seasonally dormant houseplant dropping most of its leaves in winter. The plant is intact underground and the top growth is expendable — an alocasia that has shed every leaf but has a firm corm is dormant, not dead, and is most often killed afterwards by being watered as though it were still growing.
What brings it on
Shortening days and falling temperatures. Expected in herbaceous perennials, and in a smaller group of houseplants that grow from corms or tubers.
source
Horticultural consensusmoderate confidence
No external citation — see the evidence type above.
Checked 2026-08-13
Usually seen: October, November, December, January
Dealing with it once it is there
- Reduce watering sharply and wait. Check that the crown, corm or tuber is firm; if it is, the plant is dormant and the correct action is to leave it dry and cool until growth restarts.
source
Sourced guidancehigh confidence
- Royal Horticultural Society: Herbaceous perennials — autumn care
Checked 2026-08-13
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.
Plant-specific guides
Where this is one of several causes that look alike on a particular plant, GrowingHQ publishes the differential rather than the general answer.