Chervil / French parsley (Anthriscus cerefolium) growing guide

Quick facts

Category: herbs soft
Difficulty: beginner
Days to harvest: 45 to 70 days
Harvest type: continuous production over weeks or months
Spacing: 15 cm between plants

Environment

Temperature: 10–22°C
pH: 6 to 7
EC (hydroponic): 1 to 1.6 mS/cm
Daily light: 10 to 17 mol/m²/day

Climate and zones

USDA zones: 3 to 9 (winter low around -40°C or warmer)
Frost tolerance: frost hardy (handles regular frost)
Season: cool (spring and fall crops)

Viable growing environments:

outdoor year-round (in zone)
outdoor in growing season (annual)
unheated greenhouse / hoop house
heated greenhouse
indoor (heated home)
indoor hydroponics under grow lights

USDA zone bounds reflect outdoor year-round survival. Anywhere outside the bounded zone range, this crop still grows as an annual in the warm months (outdoor_seasonal), under cover (greenhouse), or indoors under lights.

Growing systems

Chervil works in:

deep water culture (rafts)
NFT channels
media bed (ebb and flow)
wicking bed
soil bed
vertical / aeroponic tower

Growing media

The substrate the roots sit in. Choice depends on the system (clay pebbles don't fit NFT channels; rockwool isn't used in media beds) and the crop (chervil works in the media listed below).

Medium	pH effect	Water retention	Bacterial surface
Rockwool (Mineral wool)	alkaline until pre-soaked	very high	low
Coco coir (Coconut coir)	slightly acidic	high	moderate
Perlite (Expanded volcanic glass)	neutral / inert	very low	low
Soil-based mix (Potting soil)	varies by source	high	high

Bacterial surface area matters for aquaponics: clay pebbles, lava rock, and pumice double as biofilter substrate. Low-surface media (rockwool, perlite, pea gravel) work in hydroponics but need a separate biofilter in aquaponics.

Nutrient demand by stage

NPK ratios are relative weights at each growth stage; the nutrient mix calculator scales them to absolute grams or ml. EC targets shift through the plant's life: seedlings need a much lighter solution than fruiting adults.

Stage	N	P	K	EC target (mS/cm)
seedling	2	1	1	0.8
vegetative	3	1	2	1.4

Aquaponics suitability

Compatible with typical aquaponics nutrient profiles. Fish waste provides enough nitrogen for healthy growth; supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.

Care notes

A cool-season herb that bolts rapidly in heat, making it ideal for hydroponic growing in climate-controlled environments. EC 1.0-1.5 mS/cm (light feeder). pH 6.0-7.0. Temperature: 10–18°C (the single most critical factor; above 22°C, bolting is nearly instant). Low to moderate light (DLI 10-15 mol/m2/day; unusually for herbs, chervil prefers partial shade, and strong light accelerates bolting). NFT, DWC, or Kratky systems all work. From seed to first harvest: 6-8 weeks. Harvest outer leaves by cutting at the base; the plant continues producing from the center for several weeks before inevitably bolting. Succession plant every 3-4 weeks for continuous supply. The delicate flavor is lost when dried, so chervil must be used fresh (this is why fresh chervil commands premium prices at restaurant supply). For hydroponic growers serving restaurants, fresh chervil is a high-margin specialty herb because of its rarity in retail channels and its importance in French and contemporary European cuisine.