Is store-bought lettuce suitable for regrowing?

Growing lettuce from store-purchased stems starts with choosing healthy stems. Both romaine and butterhead stems produce good regrowth. My experience is that romaine and butterhead stem leave pieces have about a 75% regrowth rate compared to iceberg, which has about a 20% rate. You should cut the stem off with 2 inches (5 cm) of stem base left to preserve all the root cells and promote new growth.

Lettuce purchased from grocery stores frequently has vegetable growth inhibitors still in the edible portion. If you are taking lettuce cuttings, keep in mind that you will want to soak the base for two hours in a solution of 1 tablespoon of hydrogen peroxide (15 mL) per quart of water to wash off the pesticides and to stimulate the dormant root cells. When I began this practice, my success in growing lettuce cuttings was increased by 40%.

The amount of light determines the speed at which regrowth occurs. For example, fluorescent grow lights placed 6 inches (15 cm) above the stem can enhance root production. Maintain the temperature between 65-75°F (18-24°C). Rotate the containers 90° each day to prevent plants from becoming leggy. After 3 weeks, you can begin tilling the outer leaves for continuous production.

Soil health can be maintained to allow for regeneration over time. At intervals of ten days, amend the soils with worm castings at the rate of ¼ cup (60 ml) per plant. If the leaf edges turn translucent, this is usually due to a calcium deficiency. Apply a tea made from crushed eggshells (two per gallon/3.8 L) once a week to re-balance minerals.

Read the full article: How to Grow Lettuce: Expert Tips for Every Gardener