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Seeds Asteraceae

Organic seeds

Tourne-sol

Green romaine lettuce 'Jericho' organic

Name: Green romaine lettuce 'Jericho' organic
Brand: Tourne-sol
SKU: LT406-a
Price: 4.49 CAD
Availability: OutOfStock

Lactuca sativa var. longifolia

Green romaine lettuce ‘Jericho’ is an organic, open-pollinated variety that forms a large green romaine. Ferme Tourne-Sol highlights its ability to hold up well in summer heat and lists maturity at approximately 60 days. Packet LT406-a contains about 400 seeds. Start indoors or directly outside, then sow every 1 to 2 weeks throughout the season. This lettuce tolerates frost. Steady moisture and frequent checks of the leaves help gardeners select the best stage for harvesting outer leaves or the whole romaine. Its large form provides a clear visual marker throughout growth and when the preferred harvest stage approaches. in summer.

Sold as 400 seeds

4 ⁴⁹$

Common nameGreen romaine lettuce ‘Jericho’

FamilyAsteraceae

GenusLactuca

Speciessativa var. longifolia

CultivarJericho

TypeSeeds

Botanical nameLactuca sativa var. longifolia

Reproducible seedsYes

Green romaine lettuce 'Jericho' organic (Lactuca sativa var. longifolia) forms a large green romaine that Ferme Tourne-Sol describes as holding up well to summer heat. This characteristic makes it an appealing choice for maintaining a lettuce harvest as the days grow warmer. Packet LT406-a contains approximately 400 organic, open-pollinated seeds. The listed maturity is 60 days, a practical reference that gardeners can adjust according to sowing date, temperature, available light, and soil moisture in their own garden. Its large form also provides a clear visual marker as the rosette steadily develops.

Seeds may be started indoors or sown directly outside throughout the season, and this lettuce tolerates frost. To stagger harvests, sow a small amount every 1 to 2 weeks. Keep the seedbed evenly moist until emergence, then water at soil level whenever the surface begins to dry. During hot weather, inspect moisture more often; a light mulch and protection from the most intense afternoon sun can help preserve fresh leaves. Label each sowing date so successive plantings remain easy to compare and harvest. This simple record is especially useful during periods of rapid summer growth.

Pick a few outer leaves as needed or cut the whole romaine when it reaches the preferred size. Its large green head makes the cultivar easy to distinguish among other lettuces. Rinse leaves under fresh, cool running water, remove damaged portions, drain with clean utensils, and refrigerate the harvest promptly. Leaves are edible; roots and flowering stems are not presented as food. To save seed, clearly label a few healthy plants and allow the seed to mature and dry completely before storage, keeping seed-saving plants separate from the kitchen harvest.

In the garden

Exposure: Full sun to partial shade
Life cycle: Annual

Sowing guide

Sowing & germination

Sowing depth

3 mm (1/8 in)

Spacing / density

15 to 30 cm (6 to 12 in) after thinning

Germination temperature

10 to 21°C (50 to 70°F)

Germination time

7 to 14 days

Sowing period

Sow throughout the season; the variety tolerates frost

Propagation

Seed

Growing method

To grow ‘Jericho’ green romaine lettuce, sow in a light seed-starting mix or directly in the garden when the conditions listed on the packet and this page are met. Keep the seedbed evenly moist without saturating it. Once seedlings emerge, abundant light helps produce compact, balanced plants. The crop prefers full sun or bright partial shade. Transplant gently when needed to protect the roots. In the garden, spacing should reflect mature size and air circulation. Water at soil level to limit splashing on the foliage. Development remains influenced by temperature and day length. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. For best results, choose a suitable location and keep moisture steady while the plants become established. This practical approach works well for both first-time gardeners and people with an established vegetable garden. Successive sowings can be considered when the growing season, available space, and crop type make them appropriate. A light mulch can help stabilize soil moisture while reducing competition from unwanted plants. The cultivar tolerates frost and can be started indoors or outside.

Soil and care

Soil & care

Care level

Easy

Watering

Water ‘Jericho’ green romaine lettuce to maintain even moisture during germination, then provide deeper soakings after establishment. The surface may dry slightly between waterings, but the root zone should not dry out completely. Morning watering at soil level reduces losses and helps keep the foliage dry. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. During warm weather, inspect moisture more often so developing leaves remain steady and fresh.

Soil type

Green romaine lettuce ‘Jericho’ prefers loose, fertile, well-drained soil that holds even moisture without remaining waterlogged. Mature compost improves structure and supports soil life. In containers, use a high-quality potting mix instead of dense garden soil. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. Check moisture regularly as the crop develops.

Fertilization

Green romaine lettuce ‘Jericho’ benefits from soil amended with mature compost before planting. A light, balanced fertilizer can be added if growth slows or the crop remains in a container for an extended season. Avoid excess nitrogen, which may favour foliage over production. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Observe leaf colour and rosette growth before applying any additional nutrients.

Seasonal care

Early in the season, Green romaine lettuce ‘Jericho’ benefits from stable sowing conditions and even moisture until germination. Young plants need sufficient light and protection from abrupt temperature changes. After establishment, watering can become deeper and less superficial, depending on weather and soil texture. A light mulch helps conserve moisture during warm periods. Remove competing weeds without disturbing the roots. Regular harvesting lets gardeners enjoy the preferred stage while monitoring continued production. Healthy residues can be composted at the end of the season, while plants showing unusual symptoms are removed from the garden. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. For best results, choose a suitable location and keep moisture steady while the plants become established. This practical approach works well for both first-time gardeners and people with an established vegetable garden. Successive sowings can be considered when the growing season, available space, and crop type make them appropriate. A light mulch can help stabilize soil moisture while reducing competition from unwanted plants. Harvest or flowering can be monitored regularly so the variety can be enjoyed at its best stage. Results may vary with temperature, light, soil conditions, and the specific microclimate of each garden. Successive sowings every 1 to 2 weeks keep plants available at several harvest stages.

Container growing

Recommended pot size

5 to 15 L (1.5 to 4 gal) container with good drainage

Green romaine lettuce ‘Jericho’ can be grown in a container when the soil volume matches its development and the pot has effective drainage holes. A loose, high-quality mix enriched with organic matter provides a sound base. Place the container where it receives full sun or bright partial shade, while keeping it accessible for moisture checks. Potting mix dries faster than garden soil, especially during hot or windy weather. Water thoroughly, then allow all excess water to drain. Light feeding may support continued growth if the mix becomes depleted. A stable, well-drained container makes it easier to monitor moisture throughout the season. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. For best results, choose a suitable location and keep moisture steady while the plants become established. This practical approach works well for both first-time gardeners and people with an established vegetable garden. Successive sowings can be considered when the growing season, available space, and crop type make them appropriate. Check moisture frequently, especially when the container warms quickly in the sun.

Bloom and dimensions

Size, flowering & harvest

Foliage color

Green

Foliage type

Herbaceous

Growth rate

Fast

Growth habit

Herbaceous rosette

Fruiting

Production in ‘Jericho’ green romaine lettuce develops according to warmth, light, watering, and soil fertility. Harvesting at the recommended stage supports the desired quality. Regular garden checks help identify produce that is ready and reduce losses caused by overly advanced maturity. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time.

Days to maturity

60 days

Harvest

Outer leaves as needed or the whole romaine; product maturity listed at 60 days

Garden associations

Companion plants & uses

Companion plants

Green romaine lettuce ‘Jericho’ can be paired with plants that require comparable light, soil, and watering. Groupings are easier to maintain when each plant keeps enough space and receives sufficient light. Suggested companions are primarily planning tools; undocumented incompatibilities should not be treated as absolute rules. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. For best results, choose a suitable location and keep moisture steady while the plants become established. Group it with compact crops that share regular moisture needs, leaving enough access for clean leaf harvesting.

Garden use

Green romaine lettuce ‘Jericho’ works well in vegetable gardens, raised beds, and edible landscapes. The harvest can be incorporated into meals according to the edible portion and preferred stage, while a few plants may be left to complete their full cycle. Its format also suits teaching gardens and collections of organic varieties. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. The distinctive large green romaine form adds visual contrast to fresh salads and edible containers throughout successive harvests.

Recipe idea

From garden to table

Edible parts

Washed leaves harvested individually or as a whole romaine; roots and flowering stems are not presented as food

For a fresh salad, harvest firm, undamaged leaves and discard any that are damaged or heavily soiled. Wash your hands and clean the counter, knife, and bowl. Rinse the leaves under fresh, cool running water until soil is removed; do not use soap and do not soak them in a sink. Drain and dry gently. Tear the leaves just before serving, then add cucumber, apple, nuts, or herbs as preferred. Dress lightly immediately before the meal to preserve texture. Refrigerate the harvest and use it promptly. Prevent cross-contamination from raw meat, poultry, fish, or seafood by using a separate clean cutting board. Roots, flowering stems, and seed intended for planting are not included in this preparation. Serve immediately on clean plates and return unused portions to the refrigerator promptly. Keep harvested leaves cool between the garden and kitchen, especially during warm weather. If a sealed product is labelled washed, pre-washed, or triple washed, follow its package directions instead of washing it again.

Frequently asked questions

How should Green romaine lettuce ‘Jericho’ be sown?

Sow Green romaine lettuce ‘Jericho’ in a light, moist medium at the depth shown on the packet or in the technical information on this page. Keep moisture steady until emergence without saturating the mix. Once seedlings appear, abundant light supports compact growth. Direct sowing is suitable when the soil is warm enough and frost risk has passed for sensitive crops. Indoor sowing can extend the season for plants that need more warmth. After emergence, thinning keeps the best-positioned seedlings and limits competition. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Keep each sowing clearly labelled for easier harvest planning.

What exposure is suitable for Green romaine lettuce ‘Jericho’?

Green romaine lettuce ‘Jericho’ prefers full sun or bright partial shade. Light quality directly affects vigour, flowering, or production. An open site generally improves air circulation and makes plants easier to monitor. In a very warm garden, light protection during the hottest hours may suit crops that tolerate partial shade, but it does not replace the species’ basic light requirements. Keep the soil loose, well drained, and evenly moist. In containers, orientation and heat reflected from nearby walls may change watering needs quickly. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce.

When should Green romaine lettuce ‘Jericho’ be harvested?

Harvest Green romaine lettuce ‘Jericho’ at the stage recommended for the variety and the intended use. Exact timing varies with the sowing date and growing conditions. Temperature, light, watering, and fertility may speed or delay development. Visual observations remain important: size, colour, firmness, and texture provide useful indicators. Check the garden regularly to harvest at the best time while leaving younger produce to continue developing. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time. For best results, choose a suitable location and keep moisture steady while the plants become established.

Can Green romaine lettuce ‘Jericho’ be grown in a container?

Green romaine lettuce ‘Jericho’ can be grown in a pot when the container provides enough depth and volume for its roots. Drainage holes are essential, along with a quality mix that remains aerated after watering. Place the container where it receives full sun or bright partial shade, and keep it accessible for moisture checks because pots dry faster than garden soil. Water thoroughly and allow excess moisture to drain completely. Light feeding may be helpful over a long season. Mature size guides the choice of diameter, stability, and any support the plant may require. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce.

Are Green romaine lettuce ‘Jericho’ seeds organic and open-pollinated?

Yes. Ferme Tourne-Sol presents the seeds for Green romaine lettuce ‘Jericho’ as organic and open-pollinated. They can therefore be saved when the plant completes its cycle and pollination is managed to preserve the variety. Seed saving still requires attention to isolation distance, a suitable plant population, and the correct maturity stage. Some species cross readily with related varieties growing nearby. For a first attempt, label plants clearly, observe flowering, and dry harvested seed completely before storage. A large green romaine head, 60-day maturity, and sowings every 1 to 2 weeks provide markers specific to this lettuce. Monitor moisture, leaf colour, and rosette development to choose the best harvest time.