Drosera filiformis is the smaller and more delicate than D. tracyi.

Drosera filiformis flower. This just happens to be Drosera 'California Sunset', a hybrid between D. filiformis and D. tracyi. It must be reproduced by leaf cuttings as the seeds don't breed true if it produces any.

Drosera filiformis and Drosera tracyi are two closely related species found on the southeast USA. Drosera filiformis is found on the Atlantic coast and common in New Jersey bogs. Drosera tracyi is found in southern Georgia, northern Florida and the gulf coastal areas of Alabama and Mississippi.

There are two varieties of Drosera filiformis found in Florida the Seed Bank calls "Florida All Red" and "Giant" but they have not been officially described. The "Florida All Red" form of D. filiformis requires minimal winter dormancy and makes an excellent terrarium plant. The "Giant" form of D. filiformis is larger than the New Jersey form but smaller than D. tracyi. This has been distributed as D. filiformis "Florida" and D. filiformis "Florida Red". It should not be confused with the "Florida All Red" form as it forms hybernacula and requires a cool dormancy.

Drosera filiformis generally requires a definite winter season to survive long term. You should consider growing them outside year round if you live within their natural range of USDA zones 6 to 9. If you live in a colder region, move the plants into a protected area after they have gone dormant. D. tracyi is found in USDA zones 9 and 10. For both these species, if the plants go dormant and are kept too warm or too wet then the hibernacula tend to rot. This is especially a problem in the spring after the weather has warmed up but the plants have not started growing.

If you want to grow D. filiformis in a terrarium, it is best to grow the D. filiformis "Florida All Red" form. The seeds germinate without stratification and most of the plants don't go dormant. This plant may be grown outdoors in summer but needs to be in a warm greenhouse or other warm location during the winter if they don't form hybernacula. Select the plants that don't form hybernacula for your terrarium and grow the ones that do outside with your other D. filiformis. In a terrarium the "Florida All Red" form won't develop the deep red color it would in full sun outdoors. This plant does well in 100% peat and kept wetter than other D. filiformis when growing.

Seeds of D. filiformis and probably D. tracyi need a "winter" to germinate. The usual way to do this is to give the seeds a few weeks of damp cold stratification. You can put pots planted with the seeds in the refrigerator for 4 weeks. An alternative is to put the seeds in a small plastic bag with damp peat or finely chopped sphagnum moss in the refrigerator. The seeds and moss can be carefully spread over the surface of the soil in a pot after stratification. Or you can be put pots planted with seed outside in the early spring and allow the seeds to sprout naturally.

No matter how you handle stratification, the seeds should not be buried when you want them to germinate. A pot with a 50:50 mix of peat and sand usually works well. D. filiformis and D. tracyi like large tall pots and can rot if the surface of the soil is too wet.