Gadenin日本語Get the appHow the year is shaped
Madeira vine is a tender perennial that lives on stored tubers. It sits dormant while it is cold, explodes into growth once the soil is properly warm, crops hardest through the hottest weeks of summer when other greens have bolted, and dies back at the first frost. In a frost-free climate it barely stops at all, which is convenient for the cook and a good deal more work for the containment routine.
That shape gives you four clear phases: a warm-spring start, a summer of fortnightly cutting, an autumn strip-down, and a winter where the only job is knowing exactly where every tuber is. The containment work runs through all four; there is no season in which you can stop looking. Even a dormant pot needs checking, because tubers shed the previous autumn will shoot as soon as the ground warms.
The schedule below is written in seasons rather than dates so it reads the same in either hemisphere. Anchor it to your own last and first frost and to soil temperature, which is the number this plant actually responds to.
| Season | Main job | Containment job |
|---|---|---|
| Late winter | Start a tuber under cover if your summers are short | Check dormant pot and paving for shoots and stray tubers |
| Spring, after last frost | Plant out or move the pot outside once nights hold above 55F (13C) | Fit the surface cover and set the catch tray before growth starts |
| Late spring | Train and fan the first stems; pinch at two feet (60 cm) | Begin the weekly sweep as soon as the vine is climbing |
| Early summer | First cut, six to eight weeks after planting; start fortnightly feeding | Cut over a sheet from the very first harvest |
| High summer | Cut every one to two weeks; water daily in heat | Peak tuber drop; sweep weekly and after every harvest |
| Autumn | Last cuts as growth slows; stop feeding | Remove flower sprays; expect the heaviest tuber fall of the year |
| First frost | Cut the whole plant to the base over a sheet | Bag every scrap; strip the frame completely bare |
| Winter | Keep the pot barely moist and frost free | Monthly check of paving, tray, joints and drains |
Spring: start it late rather than early
There is no advantage in rushing this plant into cold ground. It does nothing until the soil is above about 65F (18C) and nights are staying above 55F (13C), and a tuber sitting in cool wet mix can simply rot. Wait for settled warmth and it will make up the time within a fortnight, because growth of a foot (30 cm) a week is normal once it gets going.
If your summers are short, start a tuber in a small pot on a warm windowsill in late winter and step it up once, then move the whole thing outside when frost has passed. Harden it off over a week; leaves grown under glass scorch badly in direct sun. Get the support and the catch tray in place before the plant goes out, not after.
Late spring is also when you set the shape of the plant for the year. Fan the first stems across the support, pinch the tips at about two feet (60 cm), and pinch the strongest side shoots again a few weeks later. Ten minutes of training now gives you a full curtain of reachable leaf instead of a bare base and a tangle at the top.
Summer and autumn: cutting, then stripping down
Through the hot months you are on a fortnightly cycle: cut the top four to six inches (10 to 15 cm) of each shoot, feed with a balanced liquid fertilizer every two weeks, water daily in heat, and sweep. This is the plant's best period and the reason to grow it at all, since it is producing tender greens in weeks when lettuce bolts within days of sowing.
It is also when the aerial tubers really start coming. From midsummer onward assume every stem you touch will drop some, so the sheet comes out for every harvest and the sweep happens weekly whether or not you cut. If flower sprays appear, snip them off; they are sweetly scented but they pull energy away from leaf production, and in some climates the plant can set viable seed as well as tubers.
As nights cool below about 55F (13C), growth slows sharply and the leaves lose their gloss. Stop feeding, take your last cuts, and get ready for the strip-down. At or just before the first frost, cut the entire vine to a few inches (about 8 cm) above the mix, working over sheets and cutting into short lengths. Bag everything. Then sweep hard, because the autumn cut-down releases more tubers in one afternoon than the whole summer did.
Blanch and freeze a batch of the final harvest if you want to carry the crop into winter. A minute in boiling water, cooled and bagged, holds the texture well enough for soups.
Winter: the season people get wrong
A dormant pot looks like it needs nothing, and that is exactly why escapes are discovered in spring. Keep the mix barely moist, no more, and stand the pot somewhere it will not freeze solid if you want the plant back; a frost-free shed or a sheltered wall is plenty, as it needs no light while leafless. Then keep checking.
Once a month through winter, sweep the paving again, look into the catch tray, run your eye along paving joints, gutters and drain covers, and check any pot that stood near the vine last summer. Tubers that fell late in the season are lying there waiting for warmth, and finding them in winter is far easier than finding a vine in the thick of midsummer growth.
Winter is also the moment to decide honestly whether to carry the plant on. If you missed sweeps during the summer, if you have found shoots outside the pot, or if you are moving house, the responsible choice is to end it now: tip out the pot over a sheet, pick out every underground tuber, bag the lot for the rubbish, and mark the spot to check monthly for two years.
- Cut down at first frost Take the whole vine off its support over sheets, cutting into short lengths as you go. Leave a stub a few inches (about 8 cm) above the mix if you intend to grow it again next year.
- Strip and inspect the frame Remove every scrap of stem from the netting or mesh. Dried stubs left in the mesh often still carry tubers, and they drop the following spring when you disturb them.
- Do the heaviest sweep of the year Sweep the paving well beyond the drip line, empty the tray, and check under the pot. The cut-down releases more tubers at once than any other operation.
- Move the pot somewhere frost free A shed, garage or sheltered wall is enough; it needs no light while dormant. Water only enough to stop the mix drying to dust, roughly once a month.
- Check monthly through winter Look over the paving, the joints, the drains and any neighboring pots. Pull anything green immediately and bag it, then note the location and the date.
- Refresh the mix before spring In late winter, tip the pot out over a sheet, remove all but one healthy tuber, bag the rest, and repot in fresh mix. One tuber per pot keeps the plant manageable and the record honest.
Build a two-year record
Keep dated notes for the whole cycle: soil temperature at planting, the date the first shoot appeared, the date of the first and last harvest, how often you cut, when tubers first appeared on the stems, and the date of the autumn cut-down. Two seasons of that turns a vague sense of the year into a schedule you can trust, and it will show you clearly whether the plant is worth its space and its weekly work in your climate.
Alongside it, keep the containment record: every sweep, every tuber count, every stray shoot with its location. When you eventually stop growing this plant, that log is what tells you which parts of the garden to keep watching, and for how long.