Gardeners can grow many types of lettuce
By The Tribune-Review
Published: Friday, March 29, 2013, 8:57 p.m.
Lettuce has been a favorite garden crop since Colonial times. Today, each American downs about 30 pounds of it per year. It's no wonder, really, that this leafy vegetable is so popular. It's full of antioxidants and vitamin K, contains plenty of vitamins C and A (especially darker-colored types), and is a good source of foliate. It's also unbelievably easy to grow.
Commercial lettuce production focuses largely on a small handful of lettuce varieties that are uniform in growth, have a decent shelf life, and are shippable. But for home gardeners, the choices are far more extensive.
Lettuce is generally categorized into five distinctive groups:
• Romaine, or Cos, lettuce forms an upright, elongated head (think Caesar salad).
• Loose-leaf or leaf types have leaves of various shapes, loosely arranged around the stem.
• Crisphead lettuces form a dense, compact head, surrounded by a few looser leaves (iceberg fits in this category).
• Butterhead (also commonly called Bibb, Boston or Buttercrunch) varieties form very loose heads of tender, sweetly flavored leaves.
• Stem lettuce has elongated leaves with a very bitter flavor and is commonly used in Chinese cuisine.
But no matter what type (or types) of lettuce you decide to grow, a few simple steps will ensure your success. First and foremost, lettuce is a cool-season crop, growing best when the daytime temperatures are between 60 and 70 degrees. For those of us in Pennsylvania, that means planting lettuce from early to late spring and then again at the beginning of fall. Lettuce dislikes heat and will bolt (or go to flower) when temperatures rise and the days lengthen.
Position lettuce where it receives a minimum of six hours of direct sun (though summer-grown crops tolerate, and may even prefer, full shade) and amend the soil with plenty of organic matter. Lettuce grows best with a soil pH of 6.0 to 6.5. Test your soil every few years and adjust it accordingly.
The easiest way to grow lettuce is by seeding it directly into the garden. Seeds can be sown according to package instructions when soil temperatures range from 40 to 70 degrees. My first lettuce crop of the season usually gets seeded into the garden in late March or early April and I continue to sow more seeds every two or three weeks until the heat of summer arrives.
Many gardeners who sow seeds of lettuce directly into the garden, plan to harvest them in the “baby” stage. These young, undeveloped greens are meant to serve as a “cut-and-come-again” salad and they are sown very thickly. If, instead, you want to grow full heads of lettuce, plan to sow the seeds 1 to 3 inches apart and then thin the resulting seedlings so they are spaced 6 inches apart.
Keep your lettuce plants well-watered, providing them with a minimum of an inch of water per week. They have a very high water content and moisture stress promotes early bolting and bitterness. Mulching lettuce plants with compost, leaf mold, straw or hay keeps moisture levels stabilized and cuts down on necessary watering. If you can, irrigate in the morning to discourage fungal issues and pest woes. Fertilize with a water-soluble liquid fertilizer like fish emulsion or liquid kelp every two to three weeks until harvest.
In next week's column, I'll share some of my favorite lettuce varieties with you.
Horticulturist Jessica Walliser co-hosts “The Organic Gardeners” at 7 a.m. Sundays on KDKA Radio. She is the author of several gardening books, including “Grow Organic” and “Good Bug, Bad Bug.” Her website is www.jessicawalliser.com.
Send your gardening or landscaping questions to email@example.com or The Good Earth, 503 Martindale St., 3rd Floor, D.L. Clark Building, Pittsburgh, PA 15212.
Show commenting policy
TribLive commenting policy
You are solely responsible for your comments and by using TribLive.com you agree to our Terms of Service.
We moderate comments. Our goal is to provide substantive commentary for a general readership. By screening submissions, we provide a space where readers can share intelligent and informed commentary that enhances the quality of our news and information.
While most comments will be posted if they are on-topic and not abusive, moderating decisions are subjective. We will make them as carefully and consistently as we can. Because of the volume of reader comments, we cannot review individual moderation decisions with readers.
We value thoughtful comments representing a range of views that make their point quickly and politely. We make an effort to protect discussions from repeated comments either by the same reader or different readers.
We follow the same standards for taste as the daily newspaper. A few things we won't tolerate: personal attacks, obscenity, vulgarity, profanity (including expletives and letters followed by dashes), commercial promotion, impersonations, incoherence, proselytizing and SHOUTING. Don't include URLs to Web sites.
We do not edit comments. They are either approved or deleted. We reserve the right to edit a comment that is quoted or excerpted in an article. In this case, we may fix spelling and punctuation.
We welcome strong opinions and criticism of our work, but we don't want comments to become bogged down with discussions of our policies and we will moderate accordingly.
We appreciate it when readers and people quoted in articles or blog posts point out errors of fact or emphasis and will investigate all assertions. But these suggestions should be sent via e-mail. To avoid distracting other readers, we won't publish comments that suggest a correction. Instead, corrections will be made in a blog post or in an article.
- Garden Q&A: Firecracker vine OK for trellis?
- Starkey: Penguins’ arrogance astounding
- Matt Calvert’s goal in double OT evens series for Blue Jackets
- Penguins’ Gibbons scores twice but leaves with apparent injury
- Film tax credits bill would bump up state budget
- Draftees’ longevity key for NFL success
- North Versailles, Murrysville families still waiting for report on 2011 chopper crash that killed couple
- Pair of Braun homers spells defeat for Pirates
- Real estate notes: Work on expansion to Pediatric Specialty Hospital to begin
- NFL notebook: Pryor will be cut if he’s not traded
- One dead, one wounded in shooting at Chartiers party