How to use Halloween pumpkin seeds? Collect all your pumpkin seeds into a bowl and give them a good wash making sure you remove all the fibrous strands. Now grab a plate and some kitchen roll. Soak it and and then get rid of any excess water. Place it onto your plate Get your washed pumpkin seeds and spread them out, grab another plate and and cover them up. Spray them once a day so the towel stays moist but not wet and in a few days you’ll see roots. keep them covered until you see green shoots