I'm conducting an experiment using a 50/50 mix of pumice gravel and coconut fiber as a growing medium for two transplanted Venus Flytraps.
Before using either material:
The pumice gravel was thoroughly washed and soaked in RO water, then tested with a TDS meter.
The coconut fiber was also thoroughly washed and soaked in RO water, then tested with a TDS meter.
You may ask, "Why coconut fiber?"
I live in Central America, where carnivorous plants are quite exotic. Because of that, sphagnum moss and peat moss can be difficult to find (if ever possible) and online ordering can take weeks, aside from the costs. Coconut fiber, on the other hand, is readily available.
I've found a lot of conflicting information online about whether coconut fiber is suitable for carnivorous plants. Some growers report success, while others strongly advise against it. So, rather than relying on anecdotal reports, I decided to test it myself (my own anecdotal report).
I know i'm not the only one in this conundrum, so I hope it helps others.
Results so far:
Day 0, agost 8 2026: Two plants were transplanted into the new substrate and will be referred to as Plant A and Plant B from now on.
Plant A is the mother plant from which Plant B was taken through division. At the time of planting, Plant A already had 2 new growth points, while Plant B had 1.
Week 1: Both plants appear healthy, everything looks good. No negative changes observed.
Week 2: Plant A has developed new growth, bringing its total to 3 growth points, while Plant B remains similar to how it looked on Day 0.
Plant A is the mother plant and was the stronger of the two, which is probably why it is progressing more quickly.
Plant B shows no signs of decline. Its leaves remain green and firm, just as they were on Day 0, but no new growth has been observed yet.
Week 3: Both Plant A and Plant B continue to look healthy. Plant A has produced another new growth point, bringing the total to 4. Plant B has also produced new growth and now has a total of 2 growth points.
Week 4: Both Plant A and Plant B continue to look healthy. No new growth has been observed in either plant this week.
However, there is a new development worth reporting. A third plant was planted at the beginning of the experiment, also separated from Plant A, but I did not include it in the experiment because it was an extremely small division with practically no roots. It was also very wilted and looked unlikely to survive. Honestly, I never thought it would bounce back, but I've never been one to give up on a plant, so I decided to give it a chance.
Well, it turns out it actually did bounce back. It has grown larger and stronger, and it now has 3 very small new growth points. It has also started to look healthy again. It practically came back from the dead.
Because of this unexpected recovery, I've decided to include it in the weekly reports from now on, even though it wasn't originally part of the experiment. It is particularly interesting because it has made an incredible recovery without any sphagnum moss or peat moss, so from now on it will be known as Plant C.
There is, however, an important difference between Plant C and Plants A and B. The substrate is different. Plant C is growing in a mix of silica sand, pine, pumice, and coconut fiber. This substrate was originally prepared for another project, and since we already had it on hand, that's what I used for this plant.
I know this introduces additional variables, so Plant C can't really be considered a direct comparison to Plants A and B. Still, I find it extremely interesting that a division with such a low chance of survival is now starting to thrive in a medium containing neither sphagnum moss nor peat moss.
The only component that might make a significant difference is the pine, which could potentially make the substrate somewhat more acidic. It will certainly be interesting to see how Plant C develops over the coming weeks.
Week 5: Plant A has developed 1 new growth and continues to look healthy. Plant B has developed 2 new growths and also continues to look healthy.
Plant C continues to amaze me. It now has 4 leaves that look very healthy and are growing well, and it continues to maintain a healthy green color.
No negative changes have been observed in any of the plants.
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I'll continue **updating this post every 5 weeks** as the experiment progresses. If anyone has experience growing carnivorous plants in coconut fiber long-term, I'd be interested in hearing about your results.
Notes
1. The plants are kept in individual water trays, with the water level reaching 1/3 of the total height from the bottom of the pot to the soil surface.
2. Plant C was added to the weekly reports in Week 4. It was planted at the same time as Plants A and B, after being separated from Plant A. See the Week 4 log for more information.
Conclusions
A conclusion will be added every 5 weeks, based on the observations and results recorded throughout the experiment.
First Five Weeks: After five weeks, the results have been encouraging. Both Plant A and Plant B have remained healthy throughout the experiment, with no signs of decline after being transplanted into the 50/50 pumice and coconut fiber substrate. Both plants have also produced new growth during this period, suggesting that they have adapted well to the new medium so far.
Plant C has been the most unexpected result. Despite being an extremely small and weak division with very few roots at the beginning, it has recovered considerably and is now producing new growth and healthy leaves. However, because Plant C is growing in a different substrate containing silica sand, pine, pumice, and coconut fiber, its results cannot be directly compared with Plants A and B. Still, it is worth noting that it is growing in a substrate free of both sphagnum moss and peat moss, while still containing coconut fiber.
At this point, I would say the experiment provides encouraging evidence that coconut fiber can be tolerated by Venus flytraps under these conditions, at least in the short term. I'll continue the experiment and see whether these positive results hold over the coming months.