Now for a subject of some seriousness. We’re going to talk about “The Cube”.
For those in the carnivorous plant business, as well as with more advanced hobbyists, “cubes” refer to the prepackaged carnivores sold in hardware and home improvement stores’ garden sections. The name comes from the use of clear plastic boxes to ship and display plants, usually with three varieties of carnivore with diametrically opposed growing conditions all jammed into the same space. The boxes are an absolutely brilliant way to ship pitcher plants and sundews with a minimum of wasted packing space. Unfortunately, they’re not a good permanent living solution.
Before I start, I want to emphasize that I’m not opposed to the cubes on principle. I wouldn’t have been drawn into keeping carnivorous plants had it not been for finding a display stand full of them at a Home Depot while I was buying poplar boards for bookshelves. I still have one Nepenthes hybrid, provenance unknown, that started from one tiny plant purchased from that display stand. When I was first starting as a carnivore evangelist a year later, I was also buying up the severely discounted carnivores, at least the ones that were still alive, and rehabilitating them to give to friends. Again, cubes aren’t a permanent living solution.
The problem with cube carnivores isn’t just that they’re impulse purchases, intended with as much longterm concern for their well-being as anything else sold by the cash register at the local hardware store. It’s not just that they’re usually incredibly stressed plants by the time they’re put on display, and following the recommendation to “keep the top on your plant” usually means that it outgrows its space if it doesn’t cook in direct sun. it’s not just that the collections of flytrap, cobra plant, and lance-leafed sundew will die in a matter of weeks even under the best circumstances unless the plants are separated, and that the “growing tips” on the side of the cube have no information whatsoever on how to do this. It’s that even grocery store orchids come with better information on growing and repotting requirements than a typical cube carnivore does, and that the friendly and helpful people at your local hardware store mean well, but they have next to no correct information on feeding them. (I’ve made lots of friends in the home improvement store garden sections over the years, and I know that they suck up correct information on raising carnivores like sponges if it’s available to them. Unfortunately, Venus flytrap sales volumes are minuscule compared to roses or peach trees, so there’s no incentive from the store manager or the chain’s corporate offices to make sure they have that information.)
It’d be easy for nursery operators to tell customers “Don’t buy cube carnivores,” but I know that it’s not that easy. I think of the number of beginners who are given cubes for their birthdays, or the students who figure that one of those cubes would make a great science fair project. I also understand the urge to collect a few of those cubes when they’re on deep discount and attempt to rescue the plant inside, because I still succumb from time to time. I’m not helping convince the local Lowe’s store manager not to order more, but there’s no reason for the plant to die in order to stick with your principles.
The trick to freeing a carnivore from the cube is to understand what it is and what it needs. Sarracenia and Nepenthes pitcher plants are really bad choices for the cubes, as they get far too big far too quickly to last very long, and they often die of shock even if put into optimum conditions right away. Darlingtonia plants generally die even if they’re transplanted right away into those optimal conditions, and they usually only last a few weeks without the root disturbance. Especially if kept inside, there’s simply no way that a Venus flytrap can get enough light for proper growth in a cube, and that’s doubled if the flytrap has bugs or hamburger shoved into every trap. Butterworts and sundews need more air circulation than what’s available in cubes. Ironically enough, many terrestrial bladderworts would do better than most in a cube, so long as the cube doesn’t dry out, but I’ve never seen a bladderwort in a cube, probably because they don’t have obvious above-ground traps to attract buyers. As for other carnivores, they’re either too obscure to draw interest from anyone other than specialists (Byblis), require specialized light or temperature conditions that are almost impossible to replicate easily in a home center greenhouse (Cephalotus), or have trap structures too small to appreciate without a magnifier (Stylidium, Genlisea). The vast majority of cube plants are going to be either flytraps or pitcher plants of one sort, so let’s start with a pitcher plant.
Now, let’s look at the problems with this arrangement. Unlike cubes of days past, where the plants were shoved in the bottom amidst a handful of barely damp sphagnum moss, this one at least is in a plastic pot for drainage, but that’s the only good news. This poor Sarracenia has been in this cube for a long time, as demonstrated by the number of leaves jammed up on the top of the container. The condensation gives a good idea of the relative humidity inside of the cube, meaning both that poor air circulation has a good chance of promoting disease and fungus. Worst of all, most of the leaves are winter leaves, known as phyllodia, with tiny or nonexistent traps at the end, which means that the plant hasn’t been getting anywhere near enough light since it was first potted up. It may not die immediately, but it’s going to die soon, which may help explain why this was marked half-off at my local Lowe’s store.
Before cracking open the top, having the right equipment and supplies is vital if the plant is going to survive. These requirements include:
- A suitable amount of carnivorous plant potting mix and distilled or rain water
- A suitable pot, with sufficient drainage and ability to retail moisture at the same time. (For this exercise, we’re going to use a ProlitariPot for clarity.)
- A sharp pair of utility scissors or a sharp knife
- A plastic bag large enough to go over the plant and the pot
- At least one thin bamboo stake or dowel rod, preferably treated to resist moisture (orchid stakes work best, but chopsticks will work in a pinch)
- A indirectly bright windowsill or greenhouse space for recuperation
The first thing to do is pop open the top and see if the patient is able to be saved. Most cubes are taped shut, on top of being sealed in plastic wrap and pressure-sensitive stickers, partly to keep the cube contents in and keep meddling kids out. Examine the cube to see where the cube opens, and with the scissors or knife, cut open the various adhesives.
In this case, we have what’s probably a Sarracenia hybrid, but it’s hard to tell what kind with the way the traps are stunted and misshapen. As mentioned before, most of the leaves are phyllodia, and it’s going to be a while before it has the chance to grow any proper traps. Just getting the top open, though, is a start, and the way the leaves popped out when it came off gives an idea of how badly it needed the room to grow.
Depending upon the nursery that supplied the cube, the plants are held in place with a variety of options, such as plastic film, rubber bands and wires (seen only once, thankfully), and plastic inserts. This one came with a plastic spacer, with two wings that come in contact with the underside of the lid. The pitcher plant comes up through a hole in the spacer, and often grows over it. This spacer needs to be removed very carefully to prevent damage to the crown of the plant. If this requires grasping the leaf bunch to keep them together while pulling them through the spacer hole, do so, because any damage to the leaves in grabbing them is going to be minor compared to scraping and cutting from the sharp edges of the spacer hole.
If recycling facilities exist in your area for plastics, set the spacer aside for recycling. Otherwise, just throw it away. It won’t be needed again. The same goes for the cube itself, unless your idea of an exciting weekend involves polishing scratches out of Plexiglas.
The pitcher plant is going to look even worse once it’s removed from the cube, as the traps are too weak for most to stand upright. The good news is that it came out of the cube just in time: the humidity may have been high enough, but note that the soil mix was nearly completely dry.
While the example isn’t the greatest picture ever taken, note the bottom of the pot, and the root growing from the bottom right. This plant was in the cube for a good long time, sopping up available moisture from the bottom as water vapor leaked out the seams in the cube lid. When repotting, try to pull roots like this through the drainage holes without damaging them if at all possible. If the roots are too thick, or if they’re so extensively intertwined that they can’t be separated, use the knife or utility shears to cut them just enough to get them through.
Now it’s time to decant the plant from the shipping pot. In this shot, note the original traps growing when this plant was shipped, especially when compared to the subsequent phyllodia. This plant will make it, but it’s going to need a lot of care.
Without disturbing the root ball, remove the original pot and put the root ball into the new pot, filling the gaps with fresh carnivore growing mix. Water it down well to get the roots rehydrated and to help settle any air pockets. Take the bamboo stake (in this case, a spare orchid stake) and put it in the edge of the pot, with at least 5 centimeters of clearance above the highest trap. Place the plastic bag bottom-side up over the pot and the plant, helping to keep up the level of humidity the plant had in the cube while giving it more air circulation than before.
Finally, here’s the important part. Place the pot, plant, and bag into a well-lit space where it will not be exposed to full sun for no less than two weeks. Repeat: do NOT put the plant in full sun, as it will likely burn until it adapts to life outside the cube. Just leave it alone, making sure to add additional water if absolutely necessary.
At the end of that two weeks, remove the plastic bag and move it into better light. With sundews and Nepenthes pitcher plants, be careful not to give them full sun right away, but good partial sun is perfect while letting them get acclimated. Sarracenia pitchers and Venus flytraps need as much light as they can get. If growing conditions are right and the plant’s time in the cube wasn’t too debilitating, you should see new trap growth within two to three weeks. The existing traps won’t grow further or straighten out, but they’ll act as an essential photosynthetic resource for new traps. As the old traps brown and die off, snip them off, and encourage the new growth to spread up and out. It may take a year, but given decent growing conditions, it won’t be too long before the carnivore that was languishing in its cube is in full form, growing and even blooming.
Again, this isn’t intended to be a slam on the cube plants themselves. However, considering the effort necessary to nurse an ailing cube plant, isn’t it easier to deal directly with a nursery that specializes in carnivores than wrangling with cubes?