Gadenin日本語Get the appIt flowers better when it is snug
The roots of this plant are fine and shallow, built for a pocket of moss and leaf litter in a tree fork rather than a deep body of soil. A pot that comfortably contains them is what the plant expects, and a slightly crowded root ball is one of the conditions that pushes it towards flowering rather than towards more leaves.
Put the same plant into a pot two sizes larger and you get the opposite. The extra compost holds water that the roots cannot reach, stays wet for days, and the plant responds with soft leafy growth and no buds while the lower roots slowly rot. Over-potting is the most common repotting mistake made with this species and the damage is invisible until leaves start yellowing from the base.
So the honest answer to when you should repot is: less often than you think. Every two to three years is normal for an established plant, and many flower best in the third year in the same pot.
The signs that it actually needs doing
Judge by the plant, not by the calendar. There are four reliable signals, and if none of them is present the plant is better left alone until after the next flowering.
| Signal | What you observe | Action |
|---|---|---|
| Roots through the drainage holes | A mat of roots visible under the pot | Repot one size up after flowering |
| Dries out within two days | Needs watering far more often than last year | Repot one size up after flowering |
| Water runs straight through | The mix has broken down and shrunk from the sides | Refresh the mix, same pot size |
| White crust on the surface | Fertilizer salts built up | Flush the pot, top-dress, no repot needed |
| Sour smell, soggy compost | Roots failing | Repot immediately regardless of season, trim dead roots |
Never repot a plant carrying buds or open flowers. The root disturbance alone is usually enough to make it drop the entire cluster.
The mix to use
Standard potting mix straight from the bag is too dense and holds too much water for this plant. What you want is something that wets thoroughly and then drains within seconds, with plenty of air left in it once it has drained.
A reliable blend is roughly half peat-free potting mix, a quarter perlite or coarse pumice, and a quarter fine orchid bark. If you already grow epiphytes, an African violet mix opened up with a third perlite by volume works just as well. Add a small handful of horticultural charcoal if you have it; it keeps the mix sweeter over the years between repots.
The pot itself should have generous drainage holes. Hanging pots with a molded-in drip tray are the worst offenders here, because the reservoir sits below the compost and never dries. If you use one, drill it or commit to tipping it out after every watering.
Doing the job
The right window is the weeks immediately after flowering finishes, which is also when you cut the plant back. Doing all three jobs at once, prune, take cuttings, repot, means the plant has one disturbance to recover from instead of three, and a whole warm season ahead to do it in.
- Water the day before A moist root ball slides out in one piece; a dry one crumbles and tears the fine roots. Water thoroughly twenty-four hours before you start.
- Go up one size only From a 5 inch to a 6 inch (13 to 15 cm) pot, and no further. If the plant is in a 6 inch pot and healthy, consider refreshing the mix and returning it to the same pot rather than sizing up at all.
- Tease the outer roots, leave the core Loosen the outside inch (2-3 cm) of the root ball with your fingers so new roots grow outwards, and cut away any that are brown, soft or smell sour. Do not attempt to comb out the whole root ball.
- Set it at the same depth The old soil line should sit level with the new one, about half an inch (1 cm) below the rim. Burying the crown deeper causes stem rot at exactly the point you cannot see it.
- Water in, then hold back Water once thoroughly and let it drain fully. Then wait until the top inch (2-3 cm) is dry before the next watering, and give no fertilizer for six weeks. Fresh mix carries enough, and feeding into damaged roots burns them.
Recovery, and what to record
Expect a few weeks of stillness after repotting. Some leaf drop in the first fortnight is normal and is not a reason to water more. Keep the plant warm at 68-75F (20-24C) and out of direct sun while it re-roots, and resume the normal routine once you see new growth at the stem tips.
Write down the date, the pot size you moved to, and what the roots looked like when you tipped it out, white and firm, or brown and sparse. That last detail is the one people never remember and the one that matters most: a plant whose roots were poor at repotting needs watching for a whole season, and the note is what reminds you to look. Recording the pot size also stops the slow drift upwards in pot diameter that happens when each repot is decided from scratch.