Gadenin日本語Get the appThe shape of the year
Lotus has a single, unforgiving cycle with no second chances inside a season. The rhizome wakes in spring, spends early summer building leaves, spends high summer running a thin cord through the mud, and only swells that cord into edible segments in the last stretch of warmth before dieback. Miss any of it and you find out in autumn, not before.
That means the decisions that matter are all about heat and timing. Plant too early into cold water and the tip rots; plant too late and the runner never gets its hot stretch. Feed too late and you get soft leaves instead of fat root. Dig too early and there is nothing on the cord. The whole season is roughly four to six months from planting to harvest, and it needs sustained warmth in the middle of it.
Stage by stage through the season
The table below is written in seasonal terms rather than dates, because the triggers are water temperature and leaf behavior, both of which shift by a month or more between climates. Read it against your own tub, not the calendar.
| Stage | What you see | What you do | The judgement call |
|---|---|---|---|
| Late winter | Nothing. Mud cold and still | Leave undisturbed. Keep mud wet and unfrozen | Whether the tub is safe from freezing solid |
| Early spring | Still bare, water warming | Rebuild soil and settle it if replanting | Do not plant yet, however warm the afternoon is |
| Mid spring | Water above 60F (15C) for a week | Plant the rhizome flat, tip proud, water 2-3 in (5-8 cm) | Warm water for a full week, not one warm day |
| Late spring | Coiled leaves unrolling flat on the surface | No feed yet. Keep water shallow and warm | Floating leaves only means it is still living on reserves |
| Early summer | First standing leaves clear of the water | Start aquatic tablets pushed deep. Raise water to 4-6 in (10-15 cm) | Wait for standing leaves before the first feed |
| Midsummer | Many tall leaves, runner traveling | Feed every 3-4 weeks. Top up every 2-3 days. Push escaping runners back | Count standing leaves now as your progress check |
| Late summer | Last very tall leaves, growth slowing | Stop feeding. Keep water level steady | Stopping the feed is what lets the root swell |
| Autumn | Leaves yellowing, then browning and collapsing | Wait 2-3 weeks after the last leaf browns | Every extra warm week means thicker segments |
| Late autumn | All foliage dead | Drain the tub and dig by hand. Keep a tipped piece | Dig before any risk of the mud freezing |
The five decisions the year turns on
Almost everything else is routine. These are the points where getting it wrong costs the crop, and they are worth writing on the side of the tub.
- Plant on water temperature, not the calendar Wait until the water has held above 60F (15C) for a week. Cold wet dormant rhizome is the condition rot wants, and a fortnight of patience in spring is free.
- Protect the growing tip at every handling Carry the rhizome flat on two hands and lay it in a groove rather than pressing it down. A snapped tip means no crop, and there is no recovery within the season.
- First feed at the first standing leaf Nothing before that, because there are no working roots to take it up. Then tablets buried four inches (10 cm) deep every three to four weeks, never scattered on the water.
- Last feed six weeks before dieback When the plant sends up its final tall leaf, feeding is over. Late nitrogen produces soft leaf growth instead of the swelling that makes the harvest.
- Dig late, but before the freeze Two to three weeks after the last leaf has browned. Warm autumn weeks add thickness, but ice reaching into the mud turns the whole chain to mush.
Never cut a leaf stem below the waterline at any point in the year. The hollow stem floods and the segment it feeds rots from the inside.
Overwintering and closing the loop
After the harvest you are holding next year's plant: an undamaged two or three segment piece with the pale growing tip still attached. It must stay cool, dark and permanently wet until spring. Either leave it buried in a corner of the tub with the mud kept wet and safe from freezing through, or store it in damp sand or water somewhere frost-free. A tip that dries and wrinkles is dead, because the segments are hollow chambers that will not take water back once air gets in.
In mild areas the simplest overwintering is to do nothing at all: leave the tub full, let the dead leaves stand until spring, and dig in autumn every second year instead, which gives noticeably fatter segments. That only works where the water never freezes down into the mud.
Close the loop with notes. Each year record the planting date and the water temperature that day, the date the first standing leaf appeared, each feeding date, the number of standing leaves at midsummer, the date the last leaf browned, and what the harvest actually weighed. Six lines a season is enough. After two years those notes tell you exactly which lever to pull, because with lotus every mistake is invisible until you drain the tub, and memory alone will not reconstruct why one year gave sausages and the next gave string.