My cedar trees have seed on them. Sould I cut them off. Also how long to I water the cedar ?

When cedar trees get many seeds, it is a sign they are in stress. The reason for the stress has to be determined by the process of elimination. It can be due to a lack of correct nutrients in the soil, so amend the soil with nutrient rich material. It can also be due to excess or too little water. Check your drainage. They do like a substantial amount of water, but not to sit in a pool of it. You can water them up to freeze up to give it protection from drying out over winter. Yes you can cut the seeds off, but this is only to make them more pleasing to look at.