I had a few seeds not germinate well. Lettuce & pansy. So I wrote to Denali Seed Co. letting them know what happened.
If seeds are stored near weed & feed & other herbicides with weed killers, the vapors can cause the seeds to be sterile or cause deformities.
If you notice the herbicide odor near the seed rack, steer clear of the seeds. I believe I got my seeds from Lo's & it was in the same isle as the herbicides, early in the year before the Green house side was open. Lettuce & pansies was my sterile seeds.
Denali Seed Co quote: ::"Please let us know what failed and we will refund your money for the seed. The next question is were did you buy your seed? What you describe sounds like chemical poisoning from such products as bags of Weed N Feed fertilizer. If you can smell the chemical in the store isle it will kill seed and lettuce is especially sensitive. A closed bag of Weed N Feed will kill seed and cause the deformities in other varieties you are describing. I believe your problem is an environmental issue. Did you buy all the brands of seed in the same store? We pride ourselves with our quality."