Sowing Caraway: Direct Sowing a Biennial That Waits a Year to Seed

Sow where it will stand for two years

Caraway is a true biennial. Seed sown this year makes nothing but a flat rosette of fine, carrot-like leaves and a deep white taproot, then sits through winter, and only in its second season does it throw up a flowering stem and set the seed you sowed it for. There is no way to hurry that. Choosing the position is therefore a two-year decision, not a two-month one, and the commonest mistake is putting caraway in a bed that gets dug over each spring.

Pick a spot in full sun with deep, free-draining soil. The taproot runs down eight to ten inches (20 to 25 cm) and will fork or stall in stony or compacted ground, which matters both for the first-year root harvest and for the plant's ability to survive winter. Heavy, wet clay is the one soil where caraway regularly fails outright, because the crown rots at the surface over a cold wet winter rather than dying of cold.

Do not enrich the ground heavily before sowing. Fresh manure or a nitrogen-rich feed produces a lush rosette with a soft crown that goes through winter badly, and in the second year it gives tall, floppy stems that lodge in the first storm. Ground that grew a hungry crop the previous season is close to ideal.

Caraway seed loses viability fast. Seed more than two years old germinates thinly and erratically, and a poor stand is far more often old seed than bad technique. Use fresh seed and sow it generously.

Direct sow, and never transplant

Sow direct into the final position. Like most plants with a single dominant taproot, caraway transplants badly: lifted seedlings check for weeks, and the root forks permanently at the point of damage. Modules and seed trays are a waste of effort here even if you raise everything else that way.

Sow about half an inch (1 cm) deep into a finely raked surface, then firm the soil down over the row. Caraway needs steady moisture and good seed-to-soil contact through a long germination period, and seed sown into loose, fluffy soil dries out at exactly the wrong moment. Space rows about eighteen inches (45 cm) apart, which gives you room to hoe between them all through the slow first months.

Germination takes ten to twenty-one days at soil temperatures around 50 to 60F (10 to 16C), and it can stretch beyond three weeks in cold ground. Sow either in spring once the soil has warmed past about 50F (10C), or in late summer while the soil is still warm and there are eight to ten weeks of growing weather left. Late summer sowings usually make a stronger rosette before winter and flower more reliably the following season.

Getting through the slow first weeks

The first six weeks are where most caraway sowings are lost, and almost never to cold or pests. They are lost to weeds and to hoeing. Caraway seedlings emerge as a pair of narrow grass-like seed leaves, then produce true leaves so fine and thread-like that they are genuinely hard to distinguish from young weed seedlings, and they grow slowly enough that anything coarser overtakes them within a fortnight.

Mark the row before you sow, not after. A line of canes or a scratched furrow line lets you weed confidently around a row that has not yet come up, and it stops you writing the row off as a failure at day fourteen when it simply has not emerged yet. Keeping the surface just damp through those three weeks matters more than anything you do later.

Thin in two passes rather than one. Take the stand down to about four inches (10 cm) apart when the seedlings have two or three true leaves, then to a final eight to twelve inches (20 to 30 cm) once they are clearly established and you can see which crowns are strongest. Thinning to final spacing straight away leaves you exposed if slugs take a few, and gaps in a caraway row do not fill in.

1. Rake to a fine tilth and firm the row Break the surface down finer than you would for beans or peas, draw a shallow drill, and press the soil back down after sowing. Seed-to-soil contact carries this crop through a three-week germination.
2. Sow thicker than the final stand Aim for roughly one seed per inch (2.5 cm) along the drill. Caraway germination is rarely better than seventy percent even with fresh seed, and thinning down is far easier than filling gaps.
3. Keep the surface damp for three weeks Water with a fine rose whenever the top half inch (1 cm) dries. A single hot dry day mid-germination will halve the stand, and there is no second chance once the seed has swollen.
4. Thin twice, to 4 inches then 8 to 12 inches Snip unwanted seedlings off at soil level with scissors rather than pulling them. Pulling disturbs the taproots of the neighbors you are keeping, which is the whole point of the exercise.
5. Write the sowing date on the row Record the date sown and the date the first seedlings actually appeared. Knowing your own germination interval means you stop reworking rows that were only running late.

Sowing under an existing crop

Because a first-year caraway plant occupies very little space above ground and produces nothing you will harvest until autumn at the earliest, it is worth sowing it under or beside something taller and quicker. Traditional practice was to sow it into a standing cereal or a pea row, letting the caraway establish in the shelter beneath and then take over the ground when the nurse crop was cleared.

In a garden bed the same idea works with peas, broad beans, or a row of lettuce. The taller crop shades the surface during the slow germination weeks, which is exactly when caraway is most vulnerable to drying out, and it is gone by the time the rosette needs full light in late summer. Keep the caraway row at least a foot (30 cm) clear of the nurse crop's stems so you are not treading on crowns when you clear it.

What you must not do is sow caraway into ground that will be dug, forked, or rotavated the following spring. A first-year rosette is easy to mistake for a weed in early spring, before it puts on visible growth, and a great many second-year caraway crops are hoed off by their own growers in the fortnight before they would have run to flower.