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.
How to Choose the Best Seed Starting Mix Lightweight and Hydrated Mix For your seed to grow into a healthy seedling, the best seeding mix is a lightweight and well-drained soil that has a balanced mixture of organic materials like vermiculite or perlite.