Gadenin日本語Get the appFour turning points across eight months
Garlic is a long, slow crop with very few jobs, but the timing of those few jobs decides everything. Planted in autumn, chilled through winter, growing hard in spring and lifted in early to midsummer, it holds a bed for eight or nine months. Because so much of that time is dormant, it is easy to forget the crop entirely and miss the two or three weeks that actually matter.
The stage people underestimate is the spring leaf push. Every leaf the plant makes before the bulb starts forming becomes one wrapper layer, and the number of leaves at that moment sets the ceiling on bulb size. Nothing you do after the bulb starts sizing can raise that ceiling, which is why spring feeding and weeding pay back so heavily and midsummer effort does not.
| Turning point | When | What it decides |
|---|---|---|
| Autumn planting | 6 to 8 weeks before the ground freezes | Root mass going into winter, survival rate |
| Winter chilling | Several weeks below 40F (4C) | Whether the bulb divides into cloves at all |
| Spring leaf push | From growth restart until the bulb swells | Number of wrappers and final bulb size |
| Dry finish and harvest | Last 2 to 3 weeks before lifting | Wrapper quality and how long it stores |
The stage by stage list
The list below is written against the season and against your own frost dates rather than calendar months, since the gap between a mild coastal garden and a cold inland one runs to several weeks. Work backwards from when your soil freezes to fix the planting date, and forwards from the restart of spring growth for everything after that.
The two fixed points you can rely on are the autumn planting window and the leaf-color signal at harvest. Everything in between flexes with the weather, and the plant will tell you where it has got to if you look at the leaves.
| Stage | Main jobs | The point of it |
|---|---|---|
| Early autumn | Prepare the bed, add compost and balanced fertilizer, lime if acidic | Let the soil settle before planting |
| Mid to late autumn | Split bulbs, plant cloves 2 inches (5 cm) deep, 6 inches (15 cm) apart, water once | Get roots down before the freeze |
| After the first hard frost | Mulch 3 to 4 inches (8 to 10 cm) deep | Stop frost heave, hold soil temperature steady |
| Midwinter | Monthly check for heave, mice and standing water | Catch losses while they are still fixable |
| Growth restarts | Pull mulch off the crowns, first nitrogen feed, start weeding | Maximize leaf count |
| Mid spring | Second feed, weed fortnightly, water 1 inch (2.5 cm) a week | Build the wrapper layers |
| Late spring | Cut scapes on hardneck, stop all nitrogen | Push energy into the bulb |
| Early summer | Stop watering, test dig, harvest when the bottom third of leaves brown | Clean wrappers, good storage life |
| After harvest | Cure 3 to 4 weeks in shade, trim, select planting stock | Turn a crop into eight months of garlic |
Autumn: the decisions that are hard to undo
Autumn carries the choices you cannot revisit: which cloves you plant, how deep, how far apart, and in which bed. Every one of those is locked in for eight months. Getting the bed drained and the spacing generous costs you an afternoon and is worth more than anything you can do in spring to a badly planted row.
Aim for two or three inches (five to eight cm) of top growth by the time hard frost arrives, with a full root system underneath. Then mulch after the first hard freeze and leave the bed alone. The most common autumn mistake is planting too late, and the second most common is planting into ground that grew onions or garlic within the last four years.
- Fix the planting date from your freeze date Count back six to eight weeks from when your soil normally freezes hard. That is your window, and being a week early beats being a week late.
- Check the rotation before you dig No alliums in that bed for four years. This is the cheapest disease control available and it costs nothing but a moment of planning.
- Mulch only after the first hard frost Wait until the top inch of soil has frozen once. Mulching a warm bed keeps the plants growing and attracts mice.
Spring: six weeks that make the bulb
From the restart of growth until the bulb starts to swell, garlic is in its only genuinely demanding phase. Feed twice with nitrogen, weed every fortnight, water an inch (2.5 cm) a week, and cut the scapes on hardneck types. Six weeks of attention here is worth more than anything else in the whole season.
Then everything switches off at once. Nitrogen stops when the bulb starts sizing, water stops two to three weeks before harvest, and from that point the job is simply to watch the leaves. Gardeners who keep feeding and watering into early summer because the plants look thirsty end up with thick necks, stained wrappers and a crop that will not store past autumn.
- Feed twice, then stop Nitrogen at growth restart and again about a month later. Nothing after the plant has around six full leaves or within two months of harvest.
- Weed every fortnight Garlic never shades out competition. A weedy row loses a third of its bulb weight, and shallow hoeing at under an inch (2.5 cm) is all it takes.
- Cut scapes at the full curl On hardneck garlic, cut the flower stem once it has looped right round, just above the top leaf. Expect 20 to 30 percent more bulb weight.
- Turn the water off Once the lower leaves start yellowing, stop watering completely. The dry finish is what gives you tight, clean wrappers.
Your own dates beat any general calendar
Everything above is written relative to your freeze date and to the plant's own signals, because two gardens in the same town can differ by ten days depending on soil, aspect and shelter. There is no calendar that fits every garden, and after two seasons of records there is no need for one.
Write down six things every year: the planting date, the date growth restarted in spring, the date you cut scapes, the harvest date, the total weight and the average bulb weight. The gap from scape to harvest is usually three to four weeks and is remarkably consistent for a given garden, so once you have measured it once you can plan the drying space and the harvest day in advance. The gap from planting to spring restart tells you whether you planted at the right moment. Two seasons of those six numbers and your calendar writes itself.
- Record the four dates Planting, spring restart, scape cutting and harvest. Four entries a year, and together they define your local garlic calendar.
- Weigh the crop every year Total weight and average bulb weight. Without a number, you cannot tell whether a change you made in spring actually helped.
- Note the bed and the rotation Which bed the crop was in, so that four years from now you know it is clear. Garlic rotations are longer than anyone's memory.