Chervil (Anthriscus cerefolium) is a delicate annual herb in the carrot family, closely related to parsley, and native to the Caucasus and parts of southern Russia, from where it spread through European kitchen gardens centuries ago. Its finely cut, fern-like leaves carry a soft flavor somewhere between parsley and anise, milder and more subtle than either, which makes it a classic component of French fines herbes blends. Chervil is simple to grow but short-lived and particular about timing, since it's a true cool-season crop that runs to seed quickly once summer heat arrives. Treat it more like lettuce than like a tough Mediterranean herb and it rewards you with a fast, easy, repeat-sowable crop through the cooler parts of the Kentucky growing year.
Sowing and planting
Chervil is almost always direct-sown, since its taproot resents the disturbance of transplanting and seedlings started indoors often stall or bolt early once moved. Sow seed directly where it will grow, scattering it thinly and covering it only lightly, about a quarter inch (6 mm) deep, since chervil seed germinates better with some light exposure. Keep the seedbed consistently moist until germination, which takes 10 to 14 days and can be slow and uneven in cool soil.
In zone 6b, sow in early spring as soon as the soil can be worked, several weeks before the last frost, since chervil tolerates light frost far better than it tolerates heat. A second window opens in late summer for a fall crop, sowing from late August into September for harvest through autumn and, in a mild winter, into early spring. Thin seedlings to 9 inches (23 cm) apart once they have their first true leaves, and choose a spot with part shade, since chervil planted in full sun bolts noticeably faster even in cool weather.
Growing on
Keep the soil evenly moist throughout growth; chervil's shallow roots dry out quickly, and a plant allowed to stress from drought bolts to seed well before its time. A light, rich soil with compost worked in ahead of sowing is usually enough feeding for the whole crop, since chervil grows fast and doesn't need heavy fertilizing to produce tender leaves.
Watch the weather more than the calendar: rising temperatures are what push chervil to flower, and once a plant bolts, leaf production stops and the remaining foliage turns bitter. Part shade, whether from a structure, taller companion plants, or row cover shade cloth, buys extra weeks of productive growth as the season warms toward early summer. Because the plant's useful life is short, sow a new batch every two to three weeks through the spring window to keep a continuous supply of young, tender leaves coming rather than relying on one planting to last.
Harvesting
Begin picking leaves as soon as plants have several sets of true leaves, which can be within a few weeks of germination, though a full, bushy harvest is closer to the 53-day mark. Snip outer leaves and stems with scissors, working around the plant and leaving the center growing point intact so it keeps producing; a light, repeated harvest extends the plant's useful life more than one hard cutting. Harvest in the morning when the leaves are freshest, since chervil wilts quickly once cut and its flavor fades faster than sturdier herbs like rosemary or thyme.
Use chervil fresh wherever possible, since both the flavor and the delicate leaves don't hold up well to drying; freezing chopped leaves in a little water or oil preserves the flavor far better than air-drying does. Once a planting starts to bolt, pull it and resow rather than waiting on it, since the flavor turns harsh and the plant won't return to leafy growth afterward. Succession sowing every few weeks through the cool season keeps you in fresh chervil far longer than any single planting can manage on its own.
Problems and pests
Plant flowers and turns bitter within weeks of sowing
Bolting is chervil's most common problem, triggered by warm weather, long daylight, or drought stress rather than by any pest. Sow earlier in spring, choose a part-shade spot, keep the soil consistently moist, and plan on succession sowing rather than expecting one planting to last the whole season.
Seedlings fail to come up evenly
Chervil seed germinates slowly and unevenly in anything but cool, consistently moist soil, and dry spells during germination can leave large gaps in a row. Keep the seedbed damp until seedlings appear, sow a little more thickly than you think you need, and avoid letting the surface crust over in a dry spell.
Small, ragged holes in the leaves
Flea beetles and the occasional caterpillar chew shot-holes and ragged patches in the soft foliage, particularly on young seedlings. A floating row cover laid over a bed at sowing keeps most chewing pests off while plants are small and most vulnerable.
Clusters of small insects on new growth
Aphids cluster on tender new shoots, especially in a sheltered, part-shade bed, leaving sticky residue and sometimes distorted leaves. A strong spray of water dislodges most colonies, and soap spray handles anything persistent; check plants regularly since infestations build quickly on soft growth.
Leaves turn yellow and growth stalls in a wet spell
Waterlogged soil suffocates chervil's shallow roots and shows up as yellowing, stunted growth rather than the vigorous green of a healthy planting. Improve drainage before resowing, raise the bed if the soil is heavy, and avoid overwatering once rain has already kept the soil moist.
Varieties worth growing
- Plain-leaved chervil – The standard type most seed companies sell, with flat, finely divided leaves and the classic mild anise-parsley flavor.
- Crispum (curly chervil) – A curled-leaf form that holds a decorative shape well and makes an attractive garnish, with flavor close to the plain type.
- Brussels Winter – Noted for better cold tolerance than most, a good choice for a late fall sowing meant to carry a Kentucky planting further into winter.
- Vertissimo – Selected to be slower to bolt than older types, useful for stretching a spring sowing a little longer before heat sets in.
- Fines herbes blend – Chervil is one of the four classic herbs in this French mix, traditionally paired with parsley, chives, and tarragon; worth growing alongside those for the complete blend.