Many thanks to both of you for responding. I've been away, and just now read your answers. Let me clarify: I did indeed mean something more like dwarf Alberta spruce shrubs, and not actual spruce trees. I don't know the exact name of the shrubs I'm refering to, since they were here at the house when I bought it more than 20 years ago (that in itself might be the problem!). However, they are no more than about 3.5 - 4 feet tall, and line the front of our house, and are found around the deck in the back as well. I've tried a bit of pruning, and have used additives like Job fertilizer spikes and Hollytone as well, but nothing really seems to work well for long. It's probably time to buy new ones. Garden shop, here I come!!
Thanks again for your help!