Drosera banksii is a small upright sundew whose life is timed to seasonal water. Its kidney-shaped traps are carried on arching stalks along a fleshy stem, and its hairy flowering structure helps distinguish it from a similar tropical annual. The central cultivation question is how to complete the seed-to-seed cycle, rather than how to preserve a dormant adult indefinitely.
Identity and botanical history
The accepted name in Kew's Drosera checklist is Drosera banksii R.Br. ex DC. The epithet honours Joseph Banks. Nunn and Lowrie's account traces the type material to the Endeavour River collection made by Banks and Solander in 1770; the name was published in 1824. Kew checklist, Nunn and Lowrie's account.
Its upright form once encouraged placement away from the familiar rosette-forming petiolaris sundews. The 2021 review places D. banksii and D. subtilis within section Lasiocephala in light of phylogenetic evidence. They are annual exceptions among predominantly perennial relatives. Relatedness therefore does not guarantee an identical life cycle or dormancy response.
Recognising the plant
Boaz Ng's field profile records a wide size range, from very small plants to specimens approaching 30 cm, although most observed plants were below 10 cm. The round, kidney-shaped trapping blades terminate petioles that curve away from the stem. White flowers have five petals, and conspicuous pale hairs cover the inflorescence and sepals. Foliage is often tawny to orange, sometimes becoming redder. Fierce Flora species profile.
D. subtilis can have a comparable upright outline. The conspicuously hairy inflorescence of D. banksii is useful in separating them; the corresponding structure in D. subtilis is smooth. Preserve photographs of that feature if a seed batch will later be distributed. A colour description or an impression of small size is much less useful for checking an identification.
Range and habitat
The Nunn and Lowrie review records D. banksii across northern Western Australia, the Northern Territory and Queensland, with records from New Guinea. Habitat examples include creekside loam, sandy creek margins and the drainage areas around sandstone. Their flowering window is May to July, associated with the region's seasonal climate. Those months are field observations, not a compulsory flowering calendar for plants grown elsewhere.
Ng observed germination during the wet season and flowering as sites began drying at the start of the dry season. Grassy wet patches, creekside gravel and damp tracks supported plants. This annual strategy allows a generation to use a temporary growing opportunity, leaving seed to bridge the unfavourable period.
What the life cycle means in a collection
The ecological inference is to provide warmth and dependable moisture while plants are actively developing, with enough time for flowering and seed maturation. Deliberately drying a young plant to imitate a dramatic dry season is liable to interrupt the very stage needed to maintain the accession. The sources reviewed here do not establish a universal temperature, potting ratio or germination pretreatment for this species.
An annual completing its life cycle is different from a perennial entering dormancy. A dead D. banksii stem should not be expected to return from a tuber like D. auriculata, or from the resting structure of a perennial petiolaris sundew. Continuing the collection depends on establishing the next generation.
Managing seed and evidence
Keep each accession separate through flowering, harvest and sowing. Record the date a capsule ripens rather than assuming every spent flower contains mature seed. Where several plants are grown together, distinguish an open-pollinated batch from a controlled cross; an unobserved pollination event is not verified parentage.
A useful cultivation record includes sowing date, first germination, first flower, first mature capsule and the end of adult growth. It should also record failures. If germination does not occur, the record can help separate seed age, storage history and treatment effects without inventing a species-wide explanation from one pot.
Read D. banksii alongside D. subtilis and the petiolaris-complex chapter. Its upright annual habit is an important part of the group's diversity and an example of why care instructions need to follow the species' actual biology.
Nano Nursery Drosera Encyclopedia — species profile. Related core chapters: 10 and 29. Reviewed 23 September 2026. Cultivation guidance concerns established plants; recently deflasked plants need separate acclimatisation.
