You can, but then beware, in a very sort time then, couple years, you may be looking to dig them up as they make babies under ground and get too tight then they don't bloom. I would plant them at least 4 inches apart, then you can at least relax for several years.
Tulip bulbs are different planted close, they in general don't last long, maybe 3-4 years so having to lift is not necessary. Its daffodils that continue expanding under ground.
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