I would not do that on all. I plant a lot of plants. How many tomatoes and peppers do really need. Though I still have a few bright colored peppers in the freezer.
Remove the flower at the upper most crotch of the plant. I have read leaving that one reduces flowering. I always do it, I don't know its it really works. It probably got from Organic Gardening.
I just read one way is to take cuttings and use routing hormone. I find that hard to believe. You can grow the seeds, but they will not come true. Tulips produce bulblets but I have never seen a bulb do other than reproduce itself. Obviously there must be a way that the pros do it.
I cannot imagine that you killed them. If the bulbs are hard they should be just fine.They seem to regrow when they feel like it but do like when the spring gives them a bit of warmth.
I no longer buy much in the way of plants- I grow my own. One thing I did learn was to never buy plants in bloom. They seemed always to be weak and stunted in the garden.
You may remember from an old post that I hybridized Amaryllis bulbs many years ago. I had potted them all up together and left them that way for any years. Last summer I repotted the whole lot of them, giving some of the small lingering bulbs more room and a better chance to bloom. Some bulbs...