So the first thing to do if you are planting nuts is to soak them for a minimum of 24 hours, stored in the fridge. I left mine for 3 days, mostly because I was too busy to pot them up. This does two things - causes the nut to swell, which aids germination, and fools the nut into a false sense of winter, meaning when you remove from the fridge and plant them, it thinks spring has arrived.
|This cashew has swollen to almost twice the size after soaking|
I expect the shoot will appear from the dark spot on the top of the seed.
Cashews are really supposed to be planted in a warmer climate so honestly this is really an experiment - I'm not expecting much success. I'll be keeping them indoors for a while to see if anything happens.