Gadenin日本語Get the appThe roots are anchors, so the pot stays small
In the wild this plant grows perched on branches and rocks with its roots gripping bark, not spread through soil. Indoors it keeps that habit. The root system stays small and wiry relative to the size of the rosette, and its main job is holding the plant upright while the cup does the work of supplying water.
That changes every instinct you have about potting. A pot only slightly wider than the base of the plant is correct. A generous pot holds a volume of mix that the small root system cannot dry out, and the constantly damp mix around the base is what causes rot. If in doubt, go one size smaller than looks right.
The plant is top-heavy and the pot is small, so it tips over easily. Use a heavy clay pot, or stand a light plastic pot inside a heavier outer one, rather than reaching for a bigger pot for stability.
What to pot it in
The mix has to drain almost instantly and stay airy for years. A bark-based orchid mix is the simplest correct answer straight off the shelf. If you want to mix your own, aim for something that water runs straight through and that still has visible air gaps when you squeeze it.
Ordinary potting mix on its own is wrong for this plant, whatever it says on the bag. It holds too much water around a root system that is not adapted to it, and it compacts within a season into an airless block.
| Component | Proportion | What it does |
|---|---|---|
| Medium orchid bark | 3 parts | The structure. Keeps large air gaps between pieces |
| Perlite or pumice | 1 part | Drainage and weight distribution |
| Coarse peat or coir | 1 part | Just enough moisture holding to stop it drying to dust |
| Coarse horticultural charcoal | Optional handful | Keeps the mix sweet between repottings |
When to do it, and how
There are only three real reasons to repot: the plant has outgrown its pot and tips over, the mix has broken down into a dark sour crumb, or a clump has filled the pot with pups and needs dividing. Otherwise leave it. A settled Neoregelia goes two to three years in the same pot without complaint, and disturbance costs it growing time. Do the job in warm months when it is actively growing so it re-establishes quickly.
- Empty the cup first Tip the water out before you start. Repotting with a full cup means water running down your arms and into the crown at the wrong angle, and it makes the plant far harder to hold.
- Ease the old mix off the roots Work as much of the old material away as comes off easily with your fingers. Do not scrub the roots clean and do not soak them. Broken-down sour mix should all come off; sound bark clinging to the roots can stay.
- Cut away dead roots and spent leaves Anything black, hollow or slimy comes off with clean scissors. Dry brown outer leaves pull away with a gentle downward tug. Keep the pale firm roots, however few there are.
- Set it at the same depth The base of the rosette sits level with the surface of the mix, never below it. Burying the base so the plant feels stable is the classic mistake and it rots the crown within a couple of months.
- Firm it in and stake if needed Work the mix down around the roots with a chopstick or your fingers until the plant does not wobble. A wobbling plant will not root. If it still moves, push a short stake in beside it and tie loosely rather than adding more mix on top.
- Water sparingly for a month Fill the cup as normal, but keep the mix only barely moist until new roots take hold. Keep it out of strong direct sun for two weeks, then return it to its bright position.
Mounting instead of potting, and keeping a record
Because the roots grip rather than feed, a Neoregelia can be mounted on a piece of cork bark or driftwood instead of potted. Tie the base firmly to the mount with fishing line or nylon stocking strips, add a small pad of sphagnum under the base, and keep the cup filled as usual. Within a year the roots grip the mount and the ties can be cut away. Mounted plants dry faster, so they need the cup checking more often, but they never rot at the base.
Whichever way you grow it, note the date you repotted, the pot size you used and what the roots looked like when it came out. Dead black roots at repotting time mean the mix was too wet for too long, and that note is the one that stops you repeating it. Two repottings' worth of notes will tell you exactly how long your mix lasts before it breaks down.