Subscribe Now to the Digital Almanac Monthly Magazine!
Reporting
Hi Dan,¬†Amending the soilHi Dan, Amending the soil with gypsum is not harmful but adding compost or aged manure to the clay soil would be better. If your lettuce is dry and stringy you may need to water more frequently.  

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?