A sundew can resemble a jewelled cushion, a miniature tree, a tangle of fishing line or a climbing vine. Look closer and the family resemblance appears: leaves carrying glistening droplets that help capture small animals. The Nano Nursery Drosera Encyclopedia explores that diversity, connecting the science of sundews with the decisions that make them rewarding plants to grow.
A genus worth getting to know
Drosera is the botanical genus containing the sundews. It belongs to Droseraceae, the family that also includes the Venus flytrap and the aquatic waterwheel plant. Sundews occur across a remarkably broad geographic range. The accepted genus and its distribution can be checked in Kew’s Plants of the World Online.
That broad distribution explains why a single instruction such as “keep it warm and wet” can be useful for one sundew and disastrous for another. A plant adapted to an exposed winter-wet heath has a different annual rhythm from one living beside a tropical rainforest stream. Even two species displayed together in a nursery may need different treatment when the season changes.
This encyclopedia therefore approaches each plant through three questions: what is it, where does it come from, and how does it survive the difficult part of its year? The answers provide a stronger foundation than a photograph or an attractive common name alone.
What the droplets actually do
The sparkling material is a secretion produced by glands, rather than ordinary morning dew. Sticky leaves retain prey, and digestive processes make nutrients available to the plant. Sundews still photosynthesise. Their prey supplements mineral nutrition; it does not replace light, water or healthy growth.
The practical consequence is simple: feeding cannot compensate for an unsuitable position. A plant that is stretching towards a distant window needs its light conditions assessed. A plant declining in an overheated enclosure needs its environment checked before another insect is placed on its leaves.
Different sundews also move differently. Some show an obvious curling response; others display much subtler movements. A trap that does not visibly roll around prey is not automatically malfunctioning. Our chapter on sundew biology examines these differences without turning every species into a miniature Venus flytrap.
Several useful ways to organise sundews
Collectors use terms such as pygmy, tuberous, tropical and temperate because they make a large genus easier to discuss. These terms describe different things. Pygmy usually refers to a recognisable lineage and growth style. Tuberous refers to an underground survival structure. Tropical describes geography or a cultivation regime. They are not equivalent levels in a botanical hierarchy.
The series uses practical groups to guide readers, while keeping scientific classification separate. A species can appear in more than one discussion without becoming two species. For example, a plant can be South American, highland and rosette-forming at the same time.
| A useful question | What it helps explain |
|---|---|
| Does the plant form a tuber, resting bud or persistent leafy crown? | Its survival strategy and seasonal handling |
| Is it annual or perennial? | Whether collecting seed is central to keeping the plant in cultivation |
| Does it grow in an open habitat or sheltered vegetation? | A starting point for investigating light and airflow |
| Is its origin tropical lowland, upland or temperate? | Which temperature patterns deserve attention |
| Is the name a species, hybrid or cultivar? | How accurately seedlings or divisions can retain its identity |
These are prompts for investigation, not a substitute for a species account. Habitat descriptions must also be interpreted carefully: a wet place in the wild may have moving groundwater, deep roots and cooler soil that a shallow plastic tray cannot reproduce.
A tour of the series
We begin with names, biology and choosing a plant for the space available. We then examine familiar subtropical sundews and the Cape, Asian rosette and fork-leaved groups. These chapters establish useful comparisons before moving into specialised tropical plants.
The tropical chapters distinguish Queensland rainforest sundews from woolly sundews of the petiolaris complex, the indica complex and tropical American species. Highland species receive their own treatment because latitude alone says little about the conditions on a mountain.
Pygmy and tuberous sundews occupy several chapters. Their small propagules, underground structures and seasonal rhythms deserve more than a paragraph in a general guide. South African winter-growing plants are treated separately so that summer dormancy is not mistaken for proof that a plant is an Australian-style tuberous sundew.
The later chapters cover temperate, thread-leaved and alpine plants, followed by hybrids, propagation and a reference atlas. Individual species accounts can then develop within that framework without requiring readers to relearn the basics every time.
Starting a collection thoughtfully
Begin by describing the growing space honestly. Record when direct light reaches it, how hot it becomes on a sunny afternoon and how cold it gets before dawn. Consider who will refill water trays during a hot week and whether a seasonal plant can remain undisturbed when its leaves disappear.
A small collection of correctly identified plants is easier to understand than a crowded collection with missing labels. Keep the original name, source and acquisition date. If a plant comes with a locality or clone number, preserve it exactly. Those details may later explain why it behaves differently from another plant bearing the same species name.
Avoid combining unfamiliar sundews in one pot simply because they are all carnivorous. Separate pots allow independent watering, seasonal adjustments and identification. Shared displays become easier after the needs of each plant are understood.
Six foundations for sensible care
- Light: Research the particular plant’s requirements and increase exposure gradually after transport or a change of growing environment.
- Water: Begin with a reliable low-mineral supply, such as suitable rainwater, distilled water or reverse-osmosis water. Water quality and watering frequency are separate questions.
- Soil: Use a medium appropriate to the species and growing system. Ordinary enriched houseplant compost is not a general sundew medium.
- Feeding: Treat prey as a supplement for healthy, active traps. Do not overload a small or stressed plant.
- Seasonal care: Establish whether the plant rests, remains leafy or completes its life cycle through seed. Do not impose a rest simply because another sundew needs one.
- Maintenance: Observe the growing point, keep labels legible and manage competing moss or seedlings before identity and space become confused.
These headings recur throughout the encyclopedia, but their contents change with the plant. That consistency should make differences easier to find, rather than disguise them.
Gel plants and established plants are different starting points
A sealed tissue-culture cup is its own growing environment. Plants leaving culture must adjust to an external medium, different humidity and different light. Advice written for an established outdoor specimen should not be applied immediately to a freshly opened cup.
Nano Nursery’s existing Tissue Culture Plant Care Guide provides a separate starting point. Combine acclimatisation guidance with the identity of the plant: leaving gel does not remove the eventual seasonal needs of a pygmy, tropical or temperate sundew.
A living reference, with traceable evidence
Names and classifications change as evidence improves. We use dated references, identify competing treatments and preserve familiar synonyms where they help readers find the right plant. The 2025 Australian sundew phylogenomics study is an example of why a modern encyclopedia should explain its classification instead of presenting an old diagram as permanent fact.
Conservation also begins with accurate records. Obtain cultivated plants from traceable sources, retain their identity and keep collection plants and surplus material out of natural habitats. A beautiful cultivated specimen is most valuable when its story remains attached to it.
Series position: Part 1 of 30. Continue with Part 2, Understanding Sundew Names and Groups. The contents and species index provides the complete reading order.
References: Kew Plants of the World Online; Williamson and colleagues, 2025, linked above. Additional cultivation starting points are available through the ICPS growing-guide library. Prepared September 2026.
