Anethum graveolens 'Fernleaf' (Fernleaf Dill)
Anethum graveolens 'Fernleaf' (Fernleaf Dill)
Contents
Introduction & History
Fernleaf Dill is a compact, slow-bolting variety that revolutionised home herb gardening by making dill a viable container and small-space plant. Winner of the 1992 All-America Selections award, it produces abundant feathery foliage over a long season while staying under 45 cm — a stark contrast to the towering habit of traditional dill varieties.
History & Origin
Developed in the late 1980s and introduced commercially in the early 1990s. Won the prestigious All-America Selections award in 1992 for its compact habit and prolonged leaf harvest. Created through selective breeding to address the main complaint about dill — that it bolts too quickly — making it the first dill variety suitable for containers and small gardens.
Botanical Description
Compact, bushy annual growing 30–45 cm tall with a dense, mounding habit. Leaves are finer-textured and more abundant than standard dill, deep blue-green. The plant branches more freely from the base, creating a bushier appearance. Flowers are produced later than other varieties, and the umbels are smaller. The overall effect is of a miniature dill with exceptional foliage density.
Stem: Hollow, often grooved • Leaves: Alternate, compound (pinnate or palmate) • Inflorescence: Compound umbel • Height: 45 cm at maturity • Spread: 20 cm • Foliage: dark green • Flowers: yellow (late summer)
Planting & Cultivation
Direct-sow 6 mm deep after last frost, spacing 15–20 cm apart (closer than standard dill due to compact habit). Can also be started indoors 4–6 weeks before transplanting, as its compact root system tolerates transplanting better than tall varieties. Germinates in 10–14 days. Succession-sow every 4–5 weeks (less frequently needed than standard dill due to slow bolting).
| Sun exposure | Full Sun |
| Soil pH | 5.5-6.5 |
| Spacing | 20 cm |
| Seed depth | 3–6 mm (surface-sow if light-dependent germinator) |
| Water needs | Moderate |
| Soil type | Well-drained, humus-rich loam; add perlite or grit for drainage |
Cultivation Details
Full sun, well-drained soil. 'Fernleaf' produces leaf harvests for 6–8 weeks before flowering — nearly twice as long as standard varieties. Pinch any early flower buds to extend leaf production further. Ideal for edging herb beds or interplanting in vegetable gardens. Does not need staking. Light feeding encourages leafiness.
Climate & Hardiness
Same frost sensitivity as all dill (killed below −2°C) but its slow bolting makes it more productive in warm climates where standard dill bolts within weeks. Performs well in zones 3–11 as an annual. Tolerates heat better than standard varieties, continuing to produce leaves at temperatures where 'Bouquet' would be in full seed.
USDA zones: 2-11
Minimum temperature: -5°C
Indoor growing: Suitable for windowsill culture with 6+ hours light
Seasonal Care
Spring: sow after frost danger; begin harvesting at 25–30 cm tall. Summer: continue leaf harvest; pinch any flower buds for extended production. Late summer: allow final plants to flower for seeds and beneficial insect habitat. Autumn: harvest remaining foliage. Winter: grow on a sunny windowsill — 'Fernleaf' is the best dill variety for indoor growing.
Propagation
By seed. More compact seed heads than 'Bouquet' but still produces viable seeds. Collect seed from any plants allowed to flower. Tolerates transplanting better than tall varieties due to more compact root system, though direct sowing is still preferred. Seeds viable 3–5 years.
| Method | Success rate | Time | Notes |
|---|---|---|---|
| Direct sowing | 85–95% | 7–21 days | Sow after last frost, 3–6 mm deep |
| Indoor start | 90–98% | 6–8 weeks early | Use seed trays, transplant after hardening off |
| Succession sowing | — | Every 3–4 weeks | Ensures continuous harvest all season |
Diseases & Pests
Less troubled by wind damage than tall varieties. Same pest profile as other dill — flea beetles, aphids, and swallowtail caterpillars. The dense foliage can trap humidity, so ensure adequate spacing in humid climates to prevent fungal issues. Container-grown 'Fernleaf' is generally quite pest-free.
Culinary Uses
Identical flavour to standard dill but with finer-textured fronds that are particularly attractive as a garnish. Perfect for fresh use in dips, salmon dishes, egg salads, and cream sauces. The fine texture makes it easier to chop evenly. Not the best choice for seed production — grow 'Bouquet' for seeds. Pairs beautifully with yogurt, cucumber, smoked fish, and new potatoes.
| Category | Pairing suggestions |
|---|---|
| Poultry | Chicken, turkey, duck |
| Fish | White fish, salmon, prawns |
| Vegetables | Tomatoes, courgettes, aubergine |
| Dairy | Soft cheeses, butter, cream sauces |
Medicinal & Aromatherapy
Same medicinal properties as standard dill — carminative, digestive aid, mild sedative. The concentrated leaf production makes it practical for preparing dill tea (steep fresh fronds in hot water for 5 minutes) for digestive comfort. Rich in vitamins A and C, iron, and manganese.
| Compound | Properties |
|---|---|
| myrcene | herbaceous, earthy |
| linalool | floral |
| geraniol | rose-like |
| citral | lemony |
| apigenin | mild sedative flavonoid |
Container & Companion Growing
Container Growing
The premier dill for containers. Thrives in 20+ cm deep pots with standard potting mix. No staking needed. Plant 3 seeds per 20 cm pot. Full sun on a balcony or patio. Water regularly, feed every 2 weeks with dilute liquid fertiliser. Grows well indoors on a bright windowsill, producing usable fronds year-round.
• Minimum pot size: 20–25 cm Ø, 5 L+
• Shallow roots; frequent watering needed
• Use free-draining potting compost with 20–30% perlite or grit
• Ensure drainage holes; stand on pot feet to prevent waterlogging
• Feed with dilute liquid fertiliser (half-strength) every 2–3 weeks in growing season
• Indoor: Place on brightest windowsill (south-facing ideal); supplement with grow lights in winter
Companion Planting
Ideal for interplanting in vegetable beds due to its compact size — it fits between larger crops without competing for space. Excellent alongside tomatoes, peppers, and lettuce. When allowed to flower, attracts the same beneficial insects as tall dill in a more garden-friendly package.
| ✓ Good companions | Tomatoes, Peppers, Strawberries, Carrots |
| ✗ Avoid planting with | Fennel, Rue |
Common Mistakes to Avoid
Not harvesting frequently enough — regular cutting promotes bushiness and delays bolting. Growing it for seed production (poor seed yield compared to 'Bouquet'). Planting it too deep — seeds need shallow sowing. Over-watering in containers, causing root rot. Expecting tall dill appearance — 'Fernleaf' is deliberately compact.
Harvesting & Preservation
Begin harvesting when plants reach 20 cm, cutting outer fronds. Produces usable foliage for 6–8 weeks before bolting. Harvest frequently — this encourages branching and delays flowering. Freezes well: chop fine and freeze in ice cube trays with water or olive oil. Also dries reasonably well if dried quickly in a dark, well-ventilated space.
• Time of day: Early morning, after dew has evaporated but before intense midday heat volatilises essential oils
• Growth stage: Just before flowering, when essential oil concentration peaks. Once flowers open, the plant redirects energy from leaf production
• Season: Summer
• Part harvested: Leaves
• Harvest rule: Never remove more than ⅓ of the plant at once; this ensures continued vigorous regrowth
• Technique: Cut stems cleanly above a leaf node with sharp scissors or secateurs. Tearing damages tissue and invites disease
| Method | Process | Shelf life | Best for |
|---|---|---|---|
| Air drying | Tie bundles, hang upside down in warm, dark, airy space | 6–12 months | Most herbs |
| Oven / dehydrator | Spread on trays, 35–45°C until crisp | 6–12 months | Fleshy-leaved herbs |
| Freezing (whole) | Blanch 5s, ice bath, pat dry, freeze flat on tray | 6 months | Basil, chives, parsley |
| Freezing (oil cubes) | Chop fine, pack into ice cube tray, cover with olive oil | 6 months | Any culinary herb |
| Herb salt | Layer herb and coarse salt 1:4, dry and grind | 12+ months | Rosemary, thyme, sage |
| Infused vinegar | Pack jar, cover with warm vinegar, steep 2–4 weeks | 6 months | Tarragon, dill, basil |
| Infused oil | Fill jar with dried herb, cover with oil, steep 4–6 weeks | 3–6 months | Rosemary, thyme, chilli |
Frequently Asked Questions
Why choose Fernleaf over regular dill?
Fernleaf stays compact (30–45 cm vs. 120 cm), bolts much later, grows well in containers, and produces more leaves over a longer period. Choose it when you want dill weed rather than dill seed.
Can I grow Fernleaf Dill indoors?
Yes — it's the best dill variety for indoor growing. Give it a sunny windowsill (6+ hours of light), a 20 cm deep pot, and consistent moisture. It won't match outdoor performance but will provide usable fronds year-round.
Will Fernleaf Dill produce seeds?
It will eventually flower and produce seeds, but the seed yield is much lower than 'Bouquet'. If seeds are your primary goal, grow a tall variety instead.
Seasonal Care Calendar
🌱 Spring (Mar–May)
Water: Regular
Feeding: Regular feeding
☀️ Summer (Jun–Aug)
Water: Regular
Feeding: Regular feeding
🍂 Autumn (Sep–Nov)
Water: Moderate
Feeding: Light feeding
❄️ Winter (Dec–Feb)
Water: Moderate
Feeding: Light feeding
Award-winning compact dill (30–45 cm) bred for prolonged leaf production. Slow to bolt, ideal for containers and small spaces. The best dill for fresh herb use, producing feathery foliage for 6–8 weeks. AAS winner 1992. Not for seed production — choose 'Bouquet' for that.
Quick Reference: Anethum graveolens 'Fernleaf'
Key Principles: Right location, well-drained soil, regular harvesting to promote growth, and appropriate winter protection for tender species.