Winter Carnivore Cleanups – Forkleaf Sundews

Backstory: it’s January, we don’t have any distractions, and the plants need us. Therefore, it’s time to discuss methods to clean up carnivorous plants for spring. For details, go back to the beginning.

While most sundews tend to hug the ground, several sundews native to temperate climates stretch their leaves a bit. Probably the most noted is the threadleaf sundew of the Florida Panhandle (Drosera filliformis), which can grow over a meter tall. The forked sundew of Australia (Drosera binata) doesn’t get quite that tall, but it lives under the same conditions and has a similar growth habit. D. binata may start out as a tiny plant, but it rapidly grows to fill any area it can reach with its roots, filling pots and glass containers at the first opportunity. During the growing season, it produces multiple grassy stems with a distinctive fork on each side, with sticky hairs (in the case of sundews, officially described as “tentacles”) across the forks but not the main stem. During the winter, though, the stems and forks die back and dry out as the collective plants go into winter dormancy, leaving a thick mulch that superficially makes the clump look dead. Underneath the mulch, though, are multiple new growing points, just waiting for longer and warmer days in spring. If protected from wind and subfreezing temperatures, some of the old leaves will survive the winter, only dying off in spring as the new growth replaces them. If the sundew colony is large enough in spring, the beginning of the growing season encourages multiple bloom spikes with white flowers at the ends. Unlike many sundews, forkleaf sundews are known to keep producing new blooms all the way to the end of autumn, which means lots of seeds spread in the vicinity and even thicker colonies when they sprout.

For this exercise, the following tools or their analogues are highly recommended:

  • Garden mat or old towel
  • Isopropyl alcohol, bottle or wipes
  • Hand cloth or paper towels
  • Spray bottle filled with rainwater or distilled water
  • Narrow garden shears or garden scissors
  • Long tweezers or alligator forceps
  • Tamper

Two considerations for working with forkleaf sundews: the first is that while the dead leaves and stems look absolutely horrible at the moment, like a bunch of rusty bandsaw blades, leaving them until later won’t hurt the plants in the slightest. Secondly, to be absolutely honest, the best tools for cleaning forklift sundews are your fingers, because they can gently rake up and pluck dead leaves better than any manufactured tool. If the sundew patch had anything approximating a good year, this means that you’ll be plucking and raking a thick mulch from atop new and dormant plants. If winter temperatures go below about 25 degrees F (-4 degrees C), removing that mulch early may damage those new tendrils, but from experience, new ones grow rapidly enough in spring. If any of the dead stems are still strong enough to give you a fight, cut them off with scissors, but most should break off as soon as you pull on them.

Now that last year’s detritus is gone, it’s time to look at what other work needs to be done. The good thing is that D. binata usually doesn’t need much. It usually grows in thickly enough that it chokes out most competing weeds, but feel free to pull any out with tweezers before they get established. In my personal experience, I’ve noted that D. binata tends to love being moist without being waterlogged, so using a tamper or trowel to shape the soil around the main growth for drainage is an option. Other than that, check over any remaining leaves for signs of fungus or insect pests, and clip off leaves with either.

One last note: the dead leaves on a D. binata clump may host all sorts of hibernating and dormant critters, from earwigs to young jumping spiders to snails, and snails and slugs are the only ones that should be removed. Otherwise, they have no compunctions about eating new sundew leaves when they wake up. Just dump everything you raked and plucked into the compost pile. Other than that, just keep an eye out for really cold weather (improbable but not impossible for Dallas), keep the clump moist but not soaked, and look forward to your binata being full of mosquitoes and craneflies by the middle of March.

To be continued…

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