Most tuberous Drosera produce seed in nature, some of which will germinate readily while some may require 3 or more years to germinate. There is apparently some factor (s) that inhibits germination, perhaps for survival purposes. Some seeds require effects of fire to break their dormancy. Drosera peltata and D. auriculata are the only two species that produce seed for us under cultivation. Perhaps the other species require cross-pollination to produce seed.
1. Secondary tuber: The tuberous species, when mature, commonly reproduce in nature by producing secondary tubers on lateral rhizomes; secondary tubers at times have exceeded a dozen in number.
2. Leaf cuttings: Remove the whole leaf including the petiole and place it on damp medium such as sphagnum moss; maintain a high humidity in bright light within a temperature range of 65-75°F (18-24°C). After the plantlets have grown for 5-6 months or longer it is advisable to synchronize them to your growing season so that they can be provided with conditions to induce dormancy. After dormancy has been achieved, the small tubers can be transplanted into pots. We have successfully propagated D. gigantea following this procedure.
3. Other methods: Reports of other methods for reproducing tuberous Drosera are listed below. Since we have not tried them yet we cannot vouch for them.
One technique involves growing the tuber into a shoot. As soon as the new shoot breaks through the soil surface, carefully dig into the soil and detach the tuber from the shoot and replant the tuber at the same depth as it was when it was attached to the shoot. The shoot will produce another tuber and the replanted tuber will produce a new shoot.
Another method involves cutting the tuber in half through the eye which is located in the indentation at the top or crown of the tuber. The cut surfaces are coated with wax to prevent infection and desiccation before they are planted. Each half should grow into a plant.
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