cycle dry rock?

[Boomboy]

just wondering if you left out rock that used to be live rock, and then put it in a tank that has live rock already cycled in it, does it go through a ammonia cycle or just become seeded from the other rock? pretty much just wondering if i will get a ammonia spike if dry live rock dry for 4 weeks, will cause a problem in my tank, or if i should just get a bucket and cycle it? anyone know from experince, thanks in advance.