Romaine or cos lettuce (Lactuca sativa L. var. longifolia) is a variety of lettuce that grows in a tall head of sturdy dark green leaves with firm ribs down their centers. Unlike most lettuces, it is tolerant of heat. In North America, romaine is sold as whole heads or as “hearts” that have had the outer leaves removed and are often packaged together. Commercially sold romaine lettuce has occasionally been the subject of product warnings by both U.S. and Canadian health authorities warning that consumer supplies can become contaminated with or host pathogenic E. coli bacteria.
Romain Lettuce Care
Lactuca Sativa L.
What is the plant
humidity
Normal
lighting
Full Sun
hardiness zone
5 - 11
difficulty
Medium
How to Care for the Plant
Water
Iceberg lettuce doesn't set deep roots, so it requires proper irrigation to keep the root zone moist. Watering the bed when the top inch of soil feels dry is usually sufficient. Depending on how cool and moist the weather is, the lettuce may require watering every five to 10 days.
Fertilizer
Feed lettuce plants every two weeks with a balanced water soluble or granular fertilizer, such as a 10-10-10 or a 5-5-5, diluted to half strength.
Sunlight
If you don't have enough light on a windowsill, grow your crop under lights.
Ease your plant care routine with PlantIn's personalized system.
Soil
Check the seed tray every day, and water the seeds whenever the soil feels dry. You want the soil to be moist but not soaked. If there's standing water on top of the soil, the seeds could rot. In five to ten days you should see the lettuce beginning to sprout.
Temperature
Site Needs. Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. Iceberg lettuce also makes a suitable fall crop when planted in early fall after temperatures begin to cool.
Container
Because they have shallow roots, most lettuce varieties will grow well in long and shallow containers.
Ease your plant care routine with PlantIn's personalized system.
Popularity
173 people already have this plant 35 people have added this plant to their wishlists
What's wrong with your plant?
Related Plants
Discover more plants with the list below
Related articles
Want more articles?
