Some people with chest pain have normal or minimal narrowing of heart arteries; in these patients, vasospasm is a more likely cause for the pain, sometimes in the context of Prinzmetal's angina and syndrome X.
You are here. Pure Live Seed. Pure live seed (PLS) is a measure used by the seed industry to describe the percentage of a quantity of seed that will germinate. PLS is obtained by multiplying the purity percentage by the percentage of total viable seed, then dividing by 100.
All wildflower and grass seeding rates are specified in terms of pounds, pure live seed.. The total weight of a seed bag is not the pounds of pure live seed because the contents will not be 100% pure nor will every seed germinate. This is not a reflection of poor business practices by the seed industry, but rather the nature of the seeds which cannot be changed. Calculating Pounds of Pure Live Seed.