The seeds, at least, have a near 100% germ rate. Stratified in fridge for 4 weeks and they germinated 4-5 days after.
It was easy to do as I purchased a nematode hose attachment sprayer that self emptied so i knew when i had used all the nematodes. As many reviews stated the best results would be to do it again in late September I phoned to order some more for that time period, and you only do the one order a year. It was disappointing as I wanted to make sure I got rid of the grubs as the racoons were tearing up my back yard.