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Fiero — Lettuce | DarkGrow Seed Bank

Name: Fiero
Brand: DarkGrow Seed Bank

66days to harvest

7-10 daysdays to germinate

Z3–8USDA zones

Easydifficulty

F1 hybrid

Sowing

Direct sow ¼ inch deep, or start indoors 4-6 weeks before transplant date; transplant when seedlings have 3-4 true leaves

Cultivation

Sun: Full sun (6+ hours)
Water: Moderate — regular watering
Soil: Well-draining loam enriched with compost; no specific pH requirement but slightly acidic preferred
Spacing: 10-12 inches
Height: 3-4 feet
Season: Biennial

Appearance & flavour

Colour: Deep maroon with white ribs
Size: 7-8 1/2"
Shape: Upright romaine head, 7-8.5 inches tall
Flavour: Mild, tender, subtly sweet; sweeter when grown in cool fall conditions

In the kitchen

Fresh salads, premium salad mixes, upscale plating, composed salads

Pests, disease & resistance

Pests: Aphids, slugs, snails, leafminers
Diseases: Downy mildew, lettuce mosaic virus, sclerotinia (drop)

Planting calendar by USDA zone

Zone	Start indoors	Transplant	Direct sow	Harvest
1	—	—	June – July	August – September
2	—	—	May – July	July – September
3	—	—	May – June	July – October
4	—	—	April – June	July – October
5	—	—	April – May	June – November
6	—	—	April – May	June – November
7	—	—	March – May	May – November
8	—	—	March – April	May – December
9	—	—	February – March	April – December
10	—	—	January – March	March – December
11	—	—	January – February	February – December
12	—	—	January – February	February – December
13	—	—	January – February	February – December

Companion planting

9 beneficial pairings indexed for this variety, 3 to avoid.

ChivesRepels aphids and improves lettuce flavor when planted nearby

CarrotsLoosens soil for lettuce roots and provides natural mulch with feathery foliage

RadishesQuick-growing radishes break up soil and can be harvested before lettuce needs full space

MarigoldsDeters nematodes and aphids while attracting beneficial insects

GarlicStrong scent repels slugs, snails, and aphids that commonly attack lettuce

NasturtiumsActs as trap crop for aphids and cucumber beetles, protecting lettuce

SpinachSimilar growing requirements and can share space efficiently in cool weather

DillAttracts beneficial insects like lacewings that prey on lettuce pests

ParsleyAttracts beneficial insects and provides ground cover to retain soil moisture

Avoid

BroccoliLarge leaves create too much shade and compete heavily for nutrients

SunflowersAllelopathic compounds inhibit lettuce germination and growth

Walnut treesProduce juglone which is toxic to lettuce and inhibits growth

Nutrition (per 100 g)

Protein (g): 0.742
Fat (g): 0.0738
Carbohydrate (g): 3.37
Vitamin K (µg): 20.5
Vitamin B6 (mg): 0.0401
Calcium (mg): 14.2
Iron (mg): 0.0332
Magnesium (mg): 6.31
Phosphorus (mg): 19.2
Potassium (mg): 139
Zinc (mg): 0.173

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Where to buy seed and equipment

Some links are affiliate links. If you buy through them we may earn a commission at no extra cost to you.

Growing it? There is a full cultivation guide at the lettuce growing guide.

Cultivar facts compiled from public horticultural references including USDA GRIN and NC State Extension. Descriptions are original to this catalogue.

Fiero

Sowing

Cultivation

Appearance & flavour

In the kitchen

Pests, disease & resistance

Planting calendar by USDA zone

Companion planting

Avoid

Nutrition (per 100 g)

Where to buy seed and equipment

Grown Fiero?

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