Drosera rotundifolia is immediately appealing at close range: rounded traps, slender stalks and red tentacles make a small rosette look much more intricate than its size suggests. Its familiar northern bog habitat tells only part of the story. Exceptional tropical mountain populations make this species a particularly good lesson in why plant provenance belongs beside the scientific name.
Identity and recognition
Kew accepts Drosera rotundifolia L. Its range spans much of the temperate and subarctic Northern Hemisphere, with outlying populations in Mindanao and western New Guinea. A label saying only “round-leaved sundew” therefore leaves a major climatic question unanswered. Kew taxonomic account.
The Flora of North America describes a blade that is approximately circular and broader than long, borne on a noticeably longer petiole. Small white or pink flowers rise on a largely hairless stalk. This round blade contrasts with the elongated traps of D. anglica and the narrow blades of D. linearis. The flora also records slender, spindle-shaped seeds and winter resting buds in its regional treatment. Flora of North America.
Photograph a mature leaf face-on when documenting identity. An oblique photograph can make a round blade appear narrow, and an immature plant may not yet show its typical proportions. Include the leaf stalk and growing point rather than cropping away everything except the sticky surface.
The northern wetland plant
The North American account includes bogs, fens, wet shores, seeps and other open wetland situations. It records a wide elevation range, demonstrating that “northern” does not mean one uniform habitat. Charles Darwin's investigations made this one of the best-known sundews in the history of carnivorous-plant research.
Kew describes its adhesive tentacles and digestive secretions and reports seed collections held at the Millennium Seed Bank. Its public profile lists a global Least Concern category while explaining that suitable wetland habitat can still be lost locally. A widespread species can therefore deserve conservation attention without being globally threatened. Kew plant profile.
Temperate cultivation
For temperate accessions, the International Carnivorous Plant Society emphasises seasonal cues and a definite winter rest. Plants from milder regions may be easier to accommodate in mild climates than strongly northern material. A permanently warm display cabinet is consequently a poor default for an unidentified temperate accession. ICPS seasonal guidance.
Keep the plant's origin and observed cycle together in a notebook. Record the final active leaves, formation of a compact bud and the return of spring growth. That record is more useful than deciding that every plant must become dormant on the same calendar date. For an Australian grower, Northern Hemisphere flowering months in a flora describe that region; they are not instructions to reverse the plant's response to local seasons.
The tropical highland exception
Coritico and Fleischmann documented a population on Mindanao in a very wet mountain peatland at about 1,880 m. The 2016 account established the Philippine record and compared it with the isolated New Guinean occurrence. These are tropical mountain sites, not hot lowland swamp conditions. Original Philippine report.
Fleischmann subsequently followed Philippine plants in cultivation for nearly four years. Under a twelve-hour photoperiod and cool tropical conditions, they grew without forming hibernacula. Growth could slow after flowering without a resting organ appearing. The reported regime had days around 15–25°C and nights around 5–15°C; it is an observed successful treatment, not a universal minimum and maximum. Fleischmann's 2021 observations.
That exception should remain attached to the documented provenance. It does not show that an ordinary northern accession can indefinitely skip winter. Equally, imposing freezing conditions on Philippine material merely because another population is hardy would overlook the evidence.
Maintaining useful records
Preserve the supplier's original label, any reliable locality, the propagation method and photographs across a full year. A geographic description is not automatically a named cultivar. Seed from a deliberate cross between provenances should carry that parentage instead of being presented as a pure locality line.
For this species, a successful collection begins with a small but decisive distinction: the familiar temperate bog plant and the exceptional tropical mountain material share a species name, but their documented seasonal behaviour differs.
Nano Nursery Drosera Encyclopedia — species profile. Related core chapters: 25, 27 and 29. Reviewed 23 September 2026. Cultivation guidance concerns established plants; recently deflasked plants need separate acclimatisation.
