Drosera is a large and diverse genus. Some sundews readily produce plantlets from leaves or roots, while others are best divided or grown from seed. The first rule of Drosera propagation is to check the method for your particular species.
Leaf cuttings
Many commonly grown sundews can produce new plantlets from healthy leaves. Growers may place leaves on moist sphagnum or another suitable medium, or float them in clean low-mineral water under bright indirect light. The leaf may decline while tiny plantlets emerge from its surface.
Not every Drosera responds equally well to this method, and dormant or highly seasonal species may require different timing.
Root cuttings
Species with substantial fleshy roots can sometimes produce new shoots from root sections. This can be very effective for certain sundews and inappropriate for species with fine roots that do not regenerate readily. Never sacrifice most of a small plant's root system just to experiment.
Division
Sundews that form multiple crowns, offsets, or clumps can often be divided once the individual growth points are large enough to handle. Natural division is one of the least complicated ways to produce a genetically identical plant.
Seed
Seed produces genetically unique plants rather than clones. Germination requirements vary widely. Many tropical sundews germinate readily when fresh, while temperate species may benefit from cold stratification and some specialized groups have very different dormancy or smoke/fire-related germination cues.
Keep the environment species-appropriate
Propagation material still needs the same basic environmental logic as the parent species: suitable temperature, clean low-mineral water, appropriate light, and media that does not introduce fertilizer salts.
If you are unsure, identify the exact Drosera first. A method that is easy for Drosera capensis may be wrong for a tuberous, pygmy, or winter-growing species.